try (PrintWriter file = new PrintWriter("fileName.txt")) {...}

Week 7: Enum, Generic Type, Streams, write to file, class diagram/12A. Writing to a File - PrintWriter+++

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+As the course approaches its end, let's look at a few useful Java techniques and features. 
+Some of these have been briefly covered earlier in the course. 
+Note, however, that a lot is left out, you will learn more about Java, for example, in the Advanced Object-Oriented Programming course.
+
+
+=============================================================================
+
+
+
+Writing to a File
+
+We've already discussed reading files. 
+Let's look at writing to a text file through a few simple examples. 
+The program writes the contents of a 'string list' to a file one line at a time.
+
+A line feed character "\n" is added to each line when writing.
+
+
+First, let's look at a simple example that creates a new file 
+and writes a couple of lines of text to it:
+
+try (PrintWriter file = new PrintWriter("test.txt")){
+    file.write("Hi everyone!" + "\n");
+    file.write("Creating a new file here" + "\n");
+    file.write("That's it.");
+} 
+catch (FileNotFoundException e) {
+    System.out.println("An error occurred: " + e);
+}
+ 
+
+
+
+
+As a second example, let's look at a method that takes a LIST of 'String' type and a FILE NAME as parameters. 
+The method writes the lines to the file.
+
+First, an example using a for loop:
+
+public static void writeFile(String fileName, ArrayList<String> lines) {
+    try (PrintWriter file = new PrintWriter(fileName)){
+        for (String line : lines) {
+            file.write(line + "\n");
+        }
+    } catch (FileNotFoundException e) {
+        System.out.println("An error occurred: " + e);
+    }
+}
+
+
+ 
+
+
+The same example, but utilizing streams:
+
+public static void writeFile(String fileName, ArrayList<String> lines) {
+    try (PrintWriter file = new PrintWriter(fileName)){
+        lines.stream().forEach(line -> file.write(line + "\n"));
+    } 
+    catch (FileNotFoundException e) {
+        System.out.println("An error occurred: " + e);
+    }
+}
+
+
+
+
+
+
+
+