[Java Tip]

This program displays numbers with leading zeros.

Code:

public class number {

 	public static void main(String args[]) {
 		long n = 123456789;
 		String mask = "00000000000000";
 		String ds = Long.toString(n); 

                // double to string
 	        String z = mask.substring(0 , mask.length() - ds.length()) + ds;
 	        System.out.println(z);
       }
}