You can use static constants, as m0skit0 says, or use SimpleDateFormat. Here is some code to display both methods:
Calendar cal = Calendar.getInstance();
cal.add(Calendar.MINUTE, 464);
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
System.out.println(sdf.format(cal.getTime()));
System.out.println(cal.get(Calendar.HOUR)+":"+cal.get(Calendar.MINUTE));
outputs:
05:31
5:31
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