Create 10a Strings

Week 2: Methods, strings and lists/10a Strings

@@ -0,0 +1,105 @@
+Java has variables of reference type.
+In a reference type variable, the variable is placed in reference to the actual value. 
+
+String b = "bye!";
+- immutable
+- but can point to another string
+
+
+================
+
+
+String name = "Jack Java";
+String address = "Java rd. " + "64" + ", 12345, Javatown";
+String phonenum = "040-" + (12345 * 23456); //multiply, then concat as strings
+System.out.println(name);
+System.out.println(address);
+System.out.println(phonenum);
+
+Program outputs:
+Jack Java
+Java rd. 64, 12345, Javatown
+040-289564320
+
+
+
+
+================
+
+
+
+String length - .length()
+
+
+String first = "Hey";
+System.out.println(first.length());
+
+System.out.println("Hello everyone".length());
+
+int length = (first + "!!!").length();
+System.out.println(length);
+
+
+Program outputs:
+3
+14
+6
+
+
+
+================
+
+
+single characters - charAt(i)
+
+Scanner reader = new Scanner(System.in);
+System.out.print("Give a string: ");
+String str = reader.nextLine();
+
+for (int i=0; i<str.length(); i++) {
+    System.out.println(str.charAt(i));
+}
+ 
+
+Program outputs:
+Give a string: Test
+T
+e
+s
+t
+
+
+
+
+
+
+
+
+// returns a 'character' - which is a number type
+char first = 'O';
+char second = 'k';
+System.out.println(first + second);
+
+Program outputs:
+186
+
+
+
+// A character can be converted into a string
+// 1 either by using the method toString in the Character class
+char cr = 'X';
+String str = Character.toString(cr);
+
+Program outputs:
+X
+
+
+// 2 or usually more easily by CONCATenating a character with an EMPTY STRING:
+char first = 'O';
+char second = 'k';
+System.out.println("" + first + second);
+
+Program outputs:
+Ok
+
+================