Below is my code.
public class TestCalendar {
public static void main(String[] args){
int unique_id = Integer.parseInt(\"\" + Calendar.HOUR + Calendar.M
For those who are still having some problems with this, like I did, especially when you want to print multiple times you may need to to use new like follows:
System.out.println(""+new GregorianCalendar().get(Calendar.HOUR_OF_DAY)+":"+new GregorianCalendar().get(Calendar.MINUTE)+":"+new GregorianCalendar().get(Calendar.SECOND)+":"+new GregorianCalendar().get(Calendar.MILLISECOND));