Because you need to use the new line character in most outputsand because the line-terminating characters differ on different systemsyou need to be able to identify what kind of system you're working on. Thankfully, Java provides a method with which you can retrieve the specific new line character for the type of operating system you're working on.
Use this line of code in your application to retrieve the new line character:
String newLine = System.getProperty("line.separator");
retrieves the appropriate line-terminating character(s) for the current operating system.