how to change the pattern of date in java code example

Example: how to format ddmmmyyyy to ddmmyy in java

SimpleDateFormat format1 = new SimpleDateFormat("MM/dd/yyyy");
    SimpleDateFormat format2 = new SimpleDateFormat("dd-MMM-yy");
    Date date = format1.parse("05/01/1999");
    System.out.println(format2.format(date));