Solution 1:

    String newLine = System.getProperty("line.separator");//This will retrieve line separator dependent on OS.

    System.out.println("line 1" + newLine + "line2");

Solution 2:

System.out.println("hello"+"\n"+"world");

Solution 3:

Your best shot would be with

String.format("%n")

or

System.out.printf("%n");

It is supposed to print a newline character, depending on the current platform, so it's perfect for the console.

If you are printing to a file, then it depends.