Use a SimpleDateFormat to parse the date and then print it out with a SimpleDateFormat withe the desired format.
Here's some code:
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));
Output:
01-May-99
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