Displaying the last two digits of the current year in Java

You can simply use the modulo operator:

int lastTwoDigits = Calendar.getInstance().get(Calendar.YEAR) % 100;

Edit: Using a SimpleDateFormat, as @R.J proposed, is the better solution if you want the result to be a string. If you need an integer, use modulo.

You can use a SimpleDateFormat to format a date as per your requirements.

DateFormat df = new SimpleDateFormat("yy"); // Just the year, with 2 digits
String formattedDate = df.format(Calendar.getInstance().getTime());
System.out.println(formattedDate);

Edit: Depending on the needs/requirements, either the approach suggested by me or the one suggested by Robin can be used. Ideally, when dealing with a lot of manipulations with the Date, it is better to use a DateFormat approach.