repo stringclasses 1k
values | file_url stringlengths 96 373 | file_path stringlengths 11 294 | content stringlengths 0 32.8k | language stringclasses 1
value | license stringclasses 6
values | commit_sha stringclasses 1k
values | retrieved_at stringdate 2026-01-04 14:45:56 2026-01-04 18:30:23 | truncated bool 2
classes |
|---|---|---|---|---|---|---|---|---|
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P29_RoundFloatNumber/src/main/java/modern/challenge/Main.java | Chapter01/P29_RoundFloatNumber/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
float v = 14.9877655f;
int d = 5;
float resultV1 = Numbers.roundToDecimalsV1(v, d);
float resultV2 = Numbers.roundToDecimalsV2(v, d);
float resultV3 = Numbers.roundToDecimalsV3(... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P25_MultiplyHigh/src/main/java/modern/challenge/Main.java | Chapter01/P25_MultiplyHigh/src/main/java/modern/challenge/Main.java | package modern.challenge;
import org.joou.ULong;
import static org.joou.Unsigned.ulong;
public class Main {
public static void main(String[] args) {
long x = 234253490223L;
long y = -565951223449L;
long resultSigned = Math.multiplyHigh(x, y);
System.out.p... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P35_InfiniteStreamOfRndGenerators/src/main/java/modern/challenge/Main.java | Chapter01/P35_InfiniteStreamOfRndGenerators/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
import java.util.function.Supplier;
import java.util.random.RandomGenerator.JumpableGenerat... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P20_MathAbsoluteValueOperationOverflow/src/main/java/modern/challenge/Main.java | Chapter01/P20_MathAbsoluteValueOperationOverflow/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.function.IntUnaryOperator;
import java.util.function.LongUnaryOperator;
public class Main {
public static void main(String[] args) {
int x = Integer.MIN_VALUE;
long y = Long.MIN_VALUE;
long absofx = Math.abs(x); ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P16_CustomTemplateProcessor4/src/main/java/modern/challenge/Main.java | Chapter01/P16_CustomTemplateProcessor4/src/main/java/modern/challenge/Main.java | package modern.challenge;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.util.regex.Pattern;
public class Main {
private static final Pattern PHONE_PATTERN = Pattern.compile(
"\\d{10}|(?:\\d{3}-){2}\\d{4}|\\(... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P03_TextBlockIndentation/src/main/java/modern/challenge/Main.java | Chapter01/P03_TextBlockIndentation/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
System.out.println("\nThe opening and closing delimiters are aligned:");
String json1 = """
{
"widget": {
"debug": "on",
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P33_PRNGSelectViaOf/src/main/java/modern/challenge/Main.java | Chapter01/P33_PRNGSelectViaOf/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.random.RandomGenerator;
import java.util.random.RandomGenerator.JumpableGenerator;
import java.util.random.RandomGenerator.LeapableGenerator;
import java.util.random.RandomGenerator.SplittableGenerator;
import java.util.random.RandomGenerator.StreamableGenerator;
import java.... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P30_ClampingBetweenMinMax/src/main/java/modern/challenge/PressureRegulator.java | Chapter01/P30_ClampingBetweenMinMax/src/main/java/modern/challenge/PressureRegulator.java | package modern.challenge;
public final class PressureRegulator {
private static final int MIN_PRESSURE = 10;
private static final int MAX_PRESSURE = 50;
private PressureRegulator() {
throw new AssertionError("Cannot be instantiated");
}
public static int adjustV1(int pressure) {
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P30_ClampingBetweenMinMax/src/main/java/modern/challenge/Main.java | Chapter01/P30_ClampingBetweenMinMax/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
int lowPressure = 7;
int normalPressure = 23;
int highPressure = 55;
int adjustLowPressureV1 = PressureRegulator.adjustV1(lowPressure);
int adjustHighPressureV1 = PressureRegula... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P24_DoubleIsIntegerBenchmark/src/main/java/modern/challenge/Main.java | Chapter01/P24_DoubleIsIntegerBenchmark/src/main/java/modern/challenge/Main.java | package modern.challenge;
import com.google.common.math.DoubleMath;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P13_StringConcatJDK11Benchmark/src/main/java/modern/challenge/Main.java | Chapter01/P13_StringConcatJDK11Benchmark/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measure... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P15_BuiltinStringTemplate/src/main/java/modern/challenge/Main.java | Chapter01/P15_BuiltinStringTemplate/src/main/java/modern/challenge/Main.java | package modern.challenge;
import static java.lang.StringTemplate.RAW;
import static java.lang.StringTemplate.STR;
import java.time.LocalDate;
import static java.util.FormatProcessor.FMT;
import java.util.List;
public class Main {
public static void main(String[] args) {
LocalDate fiscalDate = LocalDate.... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P22_ValueNextAlgebraicQuotient/src/main/java/modern/challenge/Main.java | Chapter01/P22_ValueNextAlgebraicQuotient/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.function.BinaryOperator;
public class Main {
public static void main(String[] args) {
int x = Integer.MIN_VALUE;
int resultFloor = Math.floorDiv(x, -1);
System.out.println("Result via floorDiv(): " + resultFloor);
int r... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P18_LocaleCurrency/src/main/java/modern/challenge/Main.java | Chapter01/P18_LocaleCurrency/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.text.NumberFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.ThreadLocalRandom;
public class Main {
public static void main(Strin... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P13_StringConcatJDK8/src/main/java/modern/challenge/Main.java | Chapter01/P13_StringConcatJDK8/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.JavaClass;
public class Main {
public static void main(String[] args) {
System.out.println("JDK 8 bytecode of Strings#conc... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P13_StringConcatJDK8/src/main/java/modern/challenge/Strings.java | Chapter01/P13_StringConcatJDK8/src/main/java/modern/challenge/Strings.java | package modern.challenge;
import java.util.List;
public class Strings {
private Strings() {
throw new AssertionError("Cannot be instantiated");
}
public static String concatViaPlus(String str1, String str2, String str3, String str4) {
return str1 + str2 + str3 + str4;
}
public ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P16_CustomTemplateProcessor3/src/main/java/modern/challenge/PhoneProcessor.java | Chapter01/P16_CustomTemplateProcessor3/src/main/java/modern/challenge/PhoneProcessor.java | package modern.challenge;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.lang.StringTemplate.Processor;
import java.util.regex.Pattern;
public class PhoneProcessor implements Processor<JsonNode, IllegalArgumentException> {
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P16_CustomTemplateProcessor3/src/main/java/modern/challenge/Main.java | Chapter01/P16_CustomTemplateProcessor3/src/main/java/modern/challenge/Main.java | package modern.challenge;
import com.fasterxml.jackson.databind.JsonNode;
public class Main {
public static void main(String[] args) {
PhoneProcessor pp = new PhoneProcessor();
String workPhone = "072-825-9009";
String homePhone = "(040)234-9670";
JsonNode jsonMessage = ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P10_TextBlockStringLiteralIntermix/src/main/java/modern/challenge/Main.java | Chapter01/P10_TextBlockStringLiteralIntermix/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
String str = "I love Java!";
String txt = """
I love Java!""";
System.out.println("Is 'str' (string literal) equal to 'txt' (text block) via '==': "
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P16_CustomTemplateProcessor5/src/main/java/modern/challenge/PhoneProcessor.java | Chapter01/P16_CustomTemplateProcessor5/src/main/java/modern/challenge/PhoneProcessor.java | package modern.challenge;
import java.lang.StringTemplate.Processor;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
public class PhoneProcessor implements Processor<String, IllegalArgumentException> {
private static final Pattern PHONE_PATTERN = Pattern.compile(
"\... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P16_CustomTemplateProcessor5/src/main/java/modern/challenge/Main.java | Chapter01/P16_CustomTemplateProcessor5/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.List;
public class Main {
public static void main(String[] args) {
PhoneProcessor pp = new PhoneProcessor();
List<String> names = List.of("Arita Ion", "Mark Jurg", "Paul Istrate");
List<String> phones= List.of("244-815-0089", "0721-825-... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P08_TextBlockEmbeddedExpressions/src/main/java/modern/challenge/Main.java | Chapter01/P08_TextBlockEmbeddedExpressions/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.text.MessageFormat;
public class Main {
public static void main(String[] args) {
// Ordinary string concatenation
System.out.println("\n Using ordinary string concatenation (+):\n");
String fn = "Jo";
String ln = "Kym";
String str1 ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P27_CountPrimeNumbers/src/main/java/modern/challenge/Primes.java | Chapter01/P27_CountPrimeNumbers/src/main/java/modern/challenge/Primes.java | package modern.challenge;
import java.util.BitSet;
public final class Primes {
private Primes() {
throw new AssertionError("Cannot be instantiated");
}
public static int count(int v) {
if (v <= 2) {
return 0;
}
BitSet bs = new BitSet();
v = v ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P27_CountPrimeNumbers/src/main/java/modern/challenge/Main.java | Chapter01/P27_CountPrimeNumbers/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
int v = 13;
int result = Primes.count(v);
System.out.println("Count: " + result);
}
}
| java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P17_LocaleOf/src/main/java/modern/challenge/Main.java | Chapter01/P17_LocaleOf/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
public class Main {
public static void main(String[] args) {
// before JDK 19
Locale roDep = new Locale("ro", "RO");
Locale deDep = new Locale("de", "DE"); // or,... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P16_CustomTemplateProcessor1/src/main/java/modern/challenge/PhoneProcessor.java | Chapter01/P16_CustomTemplateProcessor1/src/main/java/modern/challenge/PhoneProcessor.java | package modern.challenge;
import java.lang.StringTemplate.Processor;
import java.util.Iterator;
import java.util.regex.Pattern;
public class PhoneProcessor implements Processor<String, IllegalArgumentException> {
private static final Pattern PHONE_PATTERN = Pattern.compile(
"\\d{10}|(?:\\d{3}-){2... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P16_CustomTemplateProcessor1/src/main/java/modern/challenge/Main.java | Chapter01/P16_CustomTemplateProcessor1/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
PhoneProcessor pp = new PhoneProcessor();
String workPhone = "072-825-9009";
String homePhone = "(040)234-9670";
String message = pp."""
You can contact me at work at \{workP... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P26_FloorCeilModulus/src/main/java/modern/challenge/Main.java | Chapter01/P26_FloorCeilModulus/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
int dividend = 162;
int divisor = 42;
System.out.println("Floor modulus:");
int fd = Math.floorDiv(dividend, divisor);
int fmodJDK8_1 = dividend - (fd * divisor);
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P12_TextBlockIsomorphic/src/main/java/modern/challenge/Main.java | Chapter01/P12_TextBlockIsomorphic/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
String s1 = """
abbcdd
baaaad
ccddaa
""";
String s2 = """
qwwerr
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P12_TextBlockIsomorphic/src/main/java/modern/challenge/Strings.java | Chapter01/P12_TextBlockIsomorphic/src/main/java/modern/challenge/Strings.java | package modern.challenge;
import java.util.HashMap;
import java.util.Map;
public final class Strings {
private Strings() {
throw new AssertionError("Cannot be instantiated");
}
public static boolean isIsomorphic(String s1, String s2) {
if (s1 == null || s2 == null
|| s1.... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P11_RegexNamedGroups/src/main/java/modern/challenge/Main.java | Chapter01/P11_RegexNamedGroups/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.Arrays;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String[] args) {
String nameAndAddress = "Mark Janson;243 West Main St;Louisville;40202;USA";
Pattern pattern = Pattern.... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P19_UsingStrictfpInterface/src/main/java/modern/challenge/Rectangle.java | Chapter01/P19_UsingStrictfpInterface/src/main/java/modern/challenge/Rectangle.java | package modern.challenge;
// strictfp is not required starting with Java 17
public strictfp interface Rectangle {
default double area(double length, double width) {
return length * width;
}
double diagonal(double length, double width);
public class Trigono... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P19_UsingStrictfpInterface/src/main/java/modern/challenge/Main.java | Chapter01/P19_UsingStrictfpInterface/src/main/java/modern/challenge/Main.java | package modern.challenge;
// strictfp is not required starting with Java 17
@SuppressWarnings("unchecked")
public class Main implements Rectangle {
public static void main(String[] args) {
double alfa = Rectangle.Trigonometry.smallAngleOfDiagonals(10, 5);
double beta = Rectangle.Trigonometry.bigA... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P33_PRNGFindByProperty/src/main/java/modern/challenge/Main.java | Chapter01/P33_PRNGFindByProperty/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.random.RandomGenerator;
import java.util.random.RandomGeneratorFactory;
public class Main {
public static void main(String[] args) {
RandomGenerator generator = RandomGeneratorFactory.all()
.filter(RandomGeneratorFactory::isLeapa... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P27_PrimeFactors/src/main/java/modern/challenge/Primes.java | Chapter01/P27_PrimeFactors/src/main/java/modern/challenge/Primes.java | package modern.challenge;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public final class Primes {
private Primes() {
throw new AssertionError("Cannot be instantiated");
}
public static List<Integer> factorsV1(int v) {
if (v <= 1) {
// for... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P27_PrimeFactors/src/main/java/modern/challenge/Main.java | Chapter01/P27_PrimeFactors/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.List;
public class Main {
public static void main(String[] args) {
int v = 90;
List<Integer> primeFactors1 = Primes.factorsV1(v);
List<Integer> primeFactors2 = Primes.factorsV2(v);
List<Integer> primeFactors3 = Primes.factorsV3(... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P24_DoubleIsInteger/src/main/java/modern/challenge/Numbers.java | Chapter01/P24_DoubleIsInteger/src/main/java/modern/challenge/Numbers.java | package modern.challenge;
import com.google.common.math.DoubleMath;
public final class Numbers {
private Numbers() {
throw new AssertionError("Cannot be instantiated");
}
public static boolean isDoubleIntegerV1(double v) {
return v == (int) v;
}
public static boolean isDoubleIn... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P24_DoubleIsInteger/src/main/java/modern/challenge/Main.java | Chapter01/P24_DoubleIsInteger/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
double v1 = 23.11;
double v2 = 23;
double v3 = 23.0;
double v4 = Double.NaN;
double v5 = Double.NEGATIVE_INFINITY;
double v6 = Double.POSITIVE_INFINITY;
System.out.print... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P13_StringConcatJDK11/src/main/java/modern/challenge/Main.java | Chapter01/P13_StringConcatJDK11/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.JavaClass;
public class Main {
public static void main(String[] args) {
System.out.println("JDK 11 bytecode of Strings#con... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P13_StringConcatJDK11/src/main/java/modern/challenge/Strings.java | Chapter01/P13_StringConcatJDK11/src/main/java/modern/challenge/Strings.java | package modern.challenge;
import java.util.List;
public class Strings {
private Strings() {
throw new AssertionError("Cannot be instantiated");
}
public static String concatViaPlus(String str1, String str2, String str3, String str4) {
return str1 + str2 + str3 + str4;
}
public ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P19_UsingStrictfpInterfaceReflection/src/main/java/modern/challenge/Rectangle.java | Chapter01/P19_UsingStrictfpInterfaceReflection/src/main/java/modern/challenge/Rectangle.java | package modern.challenge;
// strictfp is not required starting with Java 17
public strictfp interface Rectangle {
default double area(double length, double width) {
return length * width;
}
double diagonal(double length, double width);
public class Trigono... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P19_UsingStrictfpInterfaceReflection/src/main/java/modern/challenge/Main.java | Chapter01/P19_UsingStrictfpInterfaceReflection/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.lang.reflect.Modifier;
// strictfp is not required starting with Java 17
@SuppressWarnings("unchecked")
public class Main implements Rectangle {
public static void main(String[] args) {
displayModifiers(Main.class, "diagonal");
displayModifiers(Main.class, "... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P06_TextBlockEscaping/src/main/java/modern/challenge/Main.java | Chapter01/P06_TextBlockEscaping/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
System.out.println("\n Escaping \" explicitly can be done "
+ "but is not necessary (DON'T DO THIS!):");
String txt11 = """
She told me
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P23_GetDoubleParts/src/main/java/modern/challenge/Main.java | Chapter01/P23_GetDoubleParts/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.math.BigDecimal;
public class Main {
public static void main(String[] args) {
double value = -9.33543545;
// simple approach
double fractionalPart1 = value % 1;
double integralPart1 = value - fractionalPart1;
System.out.println("Fra... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P36_LegacyRndFromRandomGenerator/src/main/java/modern/challenge/Main.java | Chapter01/P36_LegacyRndFromRandomGenerator/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.security.SecureRandom;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
import java.util.random.RandomGenerator;
import java.util.random.RandomGeneratorFactory;
public class Main {
public static void main(String[] args) {
Random legacy... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P37_ThreadSafeRandomGenerator/src/main/java/modern/challenge/Main.java | Chapter01/P37_ThreadSafeRandomGenerator/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
import java.util.random.RandomGenerator.SplittableGenerator;
impo... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P07_TextBlockTranslateEscapes/src/main/java/modern/challenge/Main.java | Chapter01/P07_TextBlockTranslateEscapes/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
// Quick test
String newline = "\\n".translateEscapes();
System.out.println(("\n".equals(newline)) ? "yes" : "no");
System.out.println();
// An example
String address = """
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P07_TextBlockTranslateEscapes/src/main/java/modern/challenge/Strings.java | Chapter01/P07_TextBlockTranslateEscapes/src/main/java/modern/challenge/Strings.java | package modern.challenge;
public final class Strings {
private Strings() {
throw new AssertionError("Cannot be instantiated");
}
// we need to pass here the unescaped version of address
public static void printAddressOnEnvelope(String address) {
// the code needed to ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P16_CustomTemplateProcessor2/src/main/java/modern/challenge/PhoneProcessor.java | Chapter01/P16_CustomTemplateProcessor2/src/main/java/modern/challenge/PhoneProcessor.java | package modern.challenge;
import java.lang.StringTemplate.Processor;
import java.util.regex.Pattern;
public class PhoneProcessor implements Processor<String, IllegalArgumentException> {
private static final Pattern PHONE_PATTERN = Pattern.compile(
"\\d{10}|(?:\\d{3}-){2}\\d{4}|\\(\\d{3}\\)\\d{3}-?\\d... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P16_CustomTemplateProcessor2/src/main/java/modern/challenge/Main.java | Chapter01/P16_CustomTemplateProcessor2/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
PhoneProcessor pp = new PhoneProcessor();
String workPhone = "072-825-9009";
String homePhone = "(040)234-9670";
String message = pp."""
You can contact me at work at \{workP... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P14_IntegerToStringBenchmark/src/main/java/modern/challenge/Main.java | Chapter01/P14_IntegerToStringBenchmark/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.Measurement;
i... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P13_StringConcatJDK8Benchmark/src/main/java/modern/challenge/Main.java | Chapter01/P13_StringConcatJDK8Benchmark/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Mode;
i... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P21_MathQuotientOperationOverflow/src/main/java/modern/challenge/Main.java | Chapter01/P21_MathQuotientOperationOverflow/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.function.BinaryOperator;
public class Main {
public static void main(String[] args) {
int x = Integer.MIN_VALUE;
int quotient = x/-1;
System.out.println("The quotient is " + quotient);
// throw Arithmeti... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P08_TextBlockEmbeddedExpressionsBenchmark/src/main/java/modern/challenge/Main.java | Chapter01/P08_TextBlockEmbeddedExpressionsBenchmark/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.text.MessageFormat;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTime... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P18_LocaleOfLocalizedDate/src/main/java/modern/challenge/Main.java | Chapter01/P18_LocaleOfLocalizedDate/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.time.OffsetTime;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;
import java.util.Locale;
publi... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P02_TextBlockDelimiters/src/main/java/modern/challenge/Main.java | Chapter01/P02_TextBlockDelimiters/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
System.out.println("The common usage of text block delimiters:\n");
String sql1 = """
UPDATE "public"."office"
SET ("address_first", "address_second", "phone") =
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P31_MulitplyTwoIntegers/src/main/java/modern/challenge/Numbers.java | Chapter01/P31_MulitplyTwoIntegers/src/main/java/modern/challenge/Numbers.java | package modern.challenge;
public final class Numbers {
private Numbers() {
throw new AssertionError("Cannot be instantiated");
}
public static int multiplyV1(int p, int q) {
// p * 0 = 0
if (q == 0) {
return 0;
}
// adding 'p' one-by-one
if (q... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P31_MulitplyTwoIntegers/src/main/java/modern/challenge/Main.java | Chapter01/P31_MulitplyTwoIntegers/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
int p = 5;
int q = -4;
int r1 = Numbers.multiplyV1(p, q);
int r2 = Numbers.multiplyV2(p, q);
System.out.println("V1: " + p + " * " + q + " = " + r1);
Sy... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P34_FillArrayRandomData/src/main/java/modern/challenge/Main.java | Chapter01/P34_FillArrayRandomData/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.io.IOException;
import java.util.Arrays;
import java.util.SplittableRandom;
import java.util.random.RandomGenerator.SplittableGenerator;
import java.util.random.RandomGeneratorFactory;
public class Main {
public static void main(String[] args) throws IOException {
S... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P05_TextBlockJustForReadability/src/main/java/modern/challenge/Main.java | Chapter01/P05_TextBlockJustForReadability/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
System.out.println("\n This whole SQL string is just on one line:");
String sql1 = """
SELECT "public"."employee"."first_name" \
FROM "public"."employee" \
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P19_UsingStrictfpClass/src/main/java/modern/challenge/Main.java | Chapter01/P19_UsingStrictfpClass/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
double x = 0.8793331;
double y = 12.22933;
double z = 901.98334884433;
double a1 = (x + y) + z;
double a2 = (x + (y + z));
double m1 = (x * y) * z;
double m2 = (x * (y * ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P19_UsingStrictfpClass/src/main/java/modern/challenge/ScientificCalculator.java | Chapter01/P19_UsingStrictfpClass/src/main/java/modern/challenge/ScientificCalculator.java | package modern.challenge;
// strictfp is not required starting with Java 17
public strictfp final class ScientificCalculator {
private ScientificCalculator() {
throw new AssertionError("Cannot be instantiated");
}
public static double multiply(final double v1, final double v2) {
r... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter01/P04_TextBlockRemovingIncidentalWhiteSpace/src/main/java/modern/challenge/Main.java | Chapter01/P04_TextBlockRemovingIncidentalWhiteSpace/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
System.out.println("\nRemoving incidental white spaces (1):");
String json1 = """
{
"widget": {
"debug": "on",
"window": {
"title": "S... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P199_StreamComparators/src/main/java/modern/challenge/Car.java | Chapter09/P199_StreamComparators/src/main/java/modern/challenge/Car.java | package modern.challenge;
import java.util.Objects;
public class Car { // implements Comparable<Car> {
private final String brand;
private final String fuel;
private final int horsepower;
public Car(String brand, String fuel, int horsepower) {
this.brand = brand;
this.fuel = fuel;
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P199_StreamComparators/src/main/java/modern/challenge/Main.java | Chapter09/P199_StreamComparators/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.ArrayList;
import java.util.Comparator;
import static java.util.Comparator.comparing;
import static java.util.Comparator.nullsLast;
import java.util.List;
public class Main {
public static void main(String[] args) {
List<Integer> nrs = new ArrayList<>();
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P189_LambdaLazinessDysfunctional/src/main/java/modern/challenge/ApplicationDependency.java | Chapter09/P189_LambdaLazinessDysfunctional/src/main/java/modern/challenge/ApplicationDependency.java | package modern.challenge;
public class ApplicationDependency {
private final long id;
private final String name;
private String dependencies;
public ApplicationDependency(long id, String name) {
this.id = id;
this.name = name;
}
public long getId() {
return id;
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P189_LambdaLazinessDysfunctional/src/main/java/modern/challenge/DependencyManager.java | Chapter09/P189_LambdaLazinessDysfunctional/src/main/java/modern/challenge/DependencyManager.java | package modern.challenge;
import java.util.HashMap;
import java.util.Map;
public class DependencyManager {
private Map<Long,String> apps = new HashMap<>();
public void processDependencies(ApplicationDependency appd){
System.out.println();
System.out.println("Processing app: ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P189_LambdaLazinessDysfunctional/src/main/java/modern/challenge/Main.java | Chapter09/P189_LambdaLazinessDysfunctional/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
ApplicationDependency app1 = new ApplicationDependency(1, "app-1");
ApplicationDependency app2 = new ApplicationDependency(2, "app-2");
DependencyManager dm = new DependencyManager();
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P204_StreamDistinctBy/src/main/java/modern/challenge/Streams.java | Chapter09/P204_StreamDistinctBy/src/main/java/modern/challenge/Streams.java | package modern.challenge;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collector;
import java.util.stream.Collectors;
public final class Streams {
private Streams() {
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P204_StreamDistinctBy/src/main/java/modern/challenge/Car.java | Chapter09/P204_StreamDistinctBy/src/main/java/modern/challenge/Car.java | package modern.challenge;
import java.util.Objects;
public class Car {
private final String brand;
private final String fuel;
private final int horsepower;
public Car(String brand, String fuel, int horsepower) {
this.brand = brand;
this.fuel = fuel;
this.horsepower = horsepow... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P204_StreamDistinctBy/src/main/java/modern/challenge/Main.java | Chapter09/P204_StreamDistinctBy/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
public class Main {
public static void main(String[] args) {
List<Car> cars = List.of(
new Car("Chevrolet", "diesel", 350),
new Car("Dacia", "diesel", ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P198_ImplementingRemoveRetainAll1/src/main/java/modern/challenge/Streams.java | Chapter09/P198_ImplementingRemoveRetainAll1/src/main/java/modern/challenge/Streams.java | package modern.challenge;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.Spliterator;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.BinaryOperator;
import java.util.... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P198_ImplementingRemoveRetainAll1/src/main/java/modern/challenge/Car.java | Chapter09/P198_ImplementingRemoveRetainAll1/src/main/java/modern/challenge/Car.java | package modern.challenge;
import java.util.Objects;
public class Car {
private final String brand;
private final String fuel;
private final int horsepower;
public Car(String brand, String fuel, int horsepower) {
this.brand = brand;
this.fuel = fuel;
this.horsepower = horsepow... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P198_ImplementingRemoveRetainAll1/src/main/java/modern/challenge/Main.java | Chapter09/P198_ImplementingRemoveRetainAll1/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.Arrays;
import java.util.List;
@SuppressWarnings("unchecked")
public class Main {
public static void main(String[] args) {
List<Car> cars = Arrays.asList(new Car("Dacia", "diesel", 100),
new Car("Lexus", "gasoline", 300), new Car("Chevrolet", "e... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P198_ImplementingRemoveRetainAll1/src/main/java/modern/challenge/StreamsWrapper.java | Chapter09/P198_ImplementingRemoveRetainAll1/src/main/java/modern/challenge/StreamsWrapper.java | package modern.challenge;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Optional;
import java.util.Spliterator;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.BinaryOperator;
import java.util.function.Consumer;
imp... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P207_ConsumerWith5Args/src/main/java/modern/challenge/Logistics.java | Chapter09/P207_ConsumerWith5Args/src/main/java/modern/challenge/Logistics.java | package modern.challenge;
public final class Logistics {
private Logistics() {
throw new AssertionError("Cannot be instantiated");
}
public static void pl4(Double a, Double b, Double c, Double d, Double x) {
System.out.println(d + ((a - d) / (1 + (Math.pow(x / c, b)))));
} ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P207_ConsumerWith5Args/src/main/java/modern/challenge/Main.java | Chapter09/P207_ConsumerWith5Args/src/main/java/modern/challenge/Main.java | package modern.challenge;
public class Main {
public static void main(String[] args) {
FiveConsumer<Double, Double, Double, Double, Double> pl4c = (a, b, c, d, x) ->
Logistics.pl4(a, b, c, d, x);
pl4c.accept(4.19, -1.10, 12.65, 0.03, 40.3);
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P207_ConsumerWith5Args/src/main/java/modern/challenge/FiveConsumer.java | Chapter09/P207_ConsumerWith5Args/src/main/java/modern/challenge/FiveConsumer.java | package modern.challenge;
@FunctionalInterface
public interface FiveConsumer <T1, T2, T3, T4, T5> {
void accept (T1 t1, T2 t2, T3 t3, T4 t4, T5 t5);
}
| java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P205_CollectorSkipKeepItems/src/main/java/modern/challenge/MyCollectors.java | Chapter09/P205_CollectorSkipKeepItems/src/main/java/modern/challenge/MyCollectors.java | package modern.challenge;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collector;
public final class MyCollectors {
private MyCollectors() {
throw new AssertionError("Cannot be instantiated");
}
public static <T> Collector<T, List<T>, L... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P205_CollectorSkipKeepItems/src/main/java/modern/challenge/Car.java | Chapter09/P205_CollectorSkipKeepItems/src/main/java/modern/challenge/Car.java | package modern.challenge;
import java.util.Objects;
public class Car {
private final String brand;
private final String fuel;
private final int horsepower;
public Car(String brand, String fuel, int horsepower) {
this.brand = brand;
this.fuel = fuel;
this.horsepower = horsepow... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P205_CollectorSkipKeepItems/src/main/java/modern/challenge/Main.java | Chapter09/P205_CollectorSkipKeepItems/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
public class Main {
public static void main(String[] args) {
List<Car> cars = List.of(
new Car("Chevrolet", "diesel", 350),
new Car("Dacia", "diesel", 100),
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P192_FilterNestedCollection/src/main/java/modern/challenge/Book.java | Chapter09/P192_FilterNestedCollection/src/main/java/modern/challenge/Book.java | package modern.challenge;
import java.time.LocalDate;
import java.util.Objects;
public class Book {
private final String title;
private final LocalDate published;
public Book(String title, LocalDate published) {
this.title = title;
this.published = published;
}
public String... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P192_FilterNestedCollection/src/main/java/modern/challenge/Main.java | Chapter09/P192_FilterNestedCollection/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
public class Main {
public static void main(String[] args) {
Book b1 = new Book("Book1", LocalDate.of(2000, 3, 12));
Book b2 = new Book("Book2", LocalDate.... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P192_FilterNestedCollection/src/main/java/modern/challenge/Author.java | Chapter09/P192_FilterNestedCollection/src/main/java/modern/challenge/Author.java | package modern.challenge;
import java.util.List;
import java.util.Objects;
public class Author {
private final String name;
private final List<Book> books;
public Author(String name, List<Book> books) {
this.name = name;
this.books = books;
}
public String getName() {
re... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P193_UsingBiPredicate/src/main/java/modern/challenge/Car.java | Chapter09/P193_UsingBiPredicate/src/main/java/modern/challenge/Car.java | package modern.challenge;
import java.util.Objects;
public class Car {
private final String brand;
private final String fuel;
private final int horsepower;
public Car(String brand, String fuel, int horsepower) {
this.brand = brand;
this.fuel = fuel;
this.horsepower = horsepow... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P193_UsingBiPredicate/src/main/java/modern/challenge/Main.java | Chapter09/P193_UsingBiPredicate/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.Arrays;
import java.util.List;
import java.util.function.BiPredicate;
import java.util.function.Predicate;
public class Main {
public static void main(String[] args) {
List<Car> cars = Arrays.asList(new Car("Dacia", "diesel", 100),
new Car("Lexu... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/MyCollectors.java | Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/MyCollectors.java | package modern.challenge;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.TreeSet;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.stream.Collector;
public final class MyCollectors {
private MyCollectors() {
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/Submersible.java | Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/Submersible.java | package modern.challenge;
import java.util.Objects;
public class Submersible implements Vehicle {
private final String type;
private final double maxdepth;
public Submersible(String type, double maxdepth) {
this.type = type;
this.maxdepth = maxdepth;
}
public String getType(... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/SplayTree.java | Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/SplayTree.java | package modern.challenge;
import java.util.ArrayDeque;
import java.util.Queue;
class SplayTree {
private Node root;
private int count;
private final class Node {
private Node left;
private Node right;
private Node parent;
private int data;
public Node() {
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/Vehicle.java | Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/Vehicle.java | package modern.challenge;
public interface Vehicle {}
| java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/Car.java | Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/Car.java | package modern.challenge;
import java.util.Objects;
public class Car implements Vehicle {
private final String brand;
private final String fuel;
private final int horsepower;
public Car(String brand, String fuel, int horsepower) {
this.brand = brand;
this.fuel = fuel;
this.ho... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/Main.java | Chapter09/P202_CustomCollectorOf/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
public class Main {
public static void main(String[] args) {
Map<Integer, Car> cars = Map.of(
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P185_MapMulti2/src/main/java/modern/challenge/Book.java | Chapter09/P185_MapMulti2/src/main/java/modern/challenge/Book.java | package modern.challenge;
import java.time.LocalDate;
import java.util.Objects;
public class Book {
private final String title;
private final LocalDate published;
public Book(String title, LocalDate published) {
this.title = title;
this.published = published;
}
public String... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P185_MapMulti2/src/main/java/modern/challenge/Bookshelf.java | Chapter09/P185_MapMulti2/src/main/java/modern/challenge/Bookshelf.java | package modern.challenge;
public class Bookshelf {
private final String author;
private final String book;
public Bookshelf(String author, String book) {
this.author = author;
this.book = book;
}
public String getAuthor() {
return author;
}
public String getBook(... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P185_MapMulti2/src/main/java/modern/challenge/Main.java | Chapter09/P185_MapMulti2/src/main/java/modern/challenge/Main.java | package modern.challenge;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
public class Main {
public static void main(String[] args) {
Book b1 = new Book("Book1", LocalDate.of(2000, 3, 12));
Book b2 = new Book("Book2", LocalDate.... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P185_MapMulti2/src/main/java/modern/challenge/Author.java | Chapter09/P185_MapMulti2/src/main/java/modern/challenge/Author.java | package modern.challenge;
import java.util.List;
import java.util.Objects;
import java.util.function.Consumer;
public class Author {
private final String name;
private final List<Book> books;
public Author(String name, List<Book> books) {
this.name = name;
this.books = books;
}
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P189_LambdaLazinessFunctional/src/main/java/modern/challenge/FSupplier.java | Chapter09/P189_LambdaLazinessFunctional/src/main/java/modern/challenge/FSupplier.java | package modern.challenge;
import java.util.function.Supplier;
@FunctionalInterface
public interface FSupplier<R> extends Supplier<R> {}
| java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P189_LambdaLazinessFunctional/src/main/java/modern/challenge/ApplicationDependency.java | Chapter09/P189_LambdaLazinessFunctional/src/main/java/modern/challenge/ApplicationDependency.java | package modern.challenge;
import java.util.function.Supplier;
public class ApplicationDependency {
private final long id;
private final String name;
private final Supplier<String> dependencies
= Memoize.supplier(this::downloadDependencies);
public ApplicationDependency(long ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P189_LambdaLazinessFunctional/src/main/java/modern/challenge/DependencyManager.java | Chapter09/P189_LambdaLazinessFunctional/src/main/java/modern/challenge/DependencyManager.java | package modern.challenge;
import java.util.HashMap;
import java.util.Map;
public class DependencyManager {
private Map<Long,String> apps = new HashMap<>();
public void processDependencies(ApplicationDependency appd){
System.out.println();
System.out.println("Processing app: ... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
PacktPublishing/Java-Coding-Problems-Second-Edition | https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition/blob/47b7c834407a607580baf8e3a23c1c24c24b8bc0/Chapter09/P189_LambdaLazinessFunctional/src/main/java/modern/challenge/Memoize.java | Chapter09/P189_LambdaLazinessFunctional/src/main/java/modern/challenge/Memoize.java | package modern.challenge;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;
@SuppressWarnings("unchecked")
public class Memoize {
private final static Object UNDEFINED = new Object();
public static <T> FSupplier<T> supplier(final Supplier<T> supplier) {
... | java | MIT | 47b7c834407a607580baf8e3a23c1c24c24b8bc0 | 2026-01-05T02:37:06.170961Z | false |
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