Java Examples - Roll through hours & months

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Problem Description:

How to roll through hours & months?

Solution:

This example shows us how to roll through monrhs (without changing year) or hrs(without changing month or year) using roll() method of Class calender.

import java.util.*;

public class Main {
   public static void main(String[] args) throws Exception {
      Date d1 = new Date();
      Calendar cl = Calendar. getInstance();
      cl.setTime(d1);
      System.out.println("today is "+ d1.toString());
      cl. roll(Calendar.MONTH, 100);
      System.out.println("date after a month will be " 
	  + cl.getTime().toString() );
      cl. roll(Calendar.HOUR, 70);
      System.out.println("date after 7 hrs will be "
      + cl.getTime().toString() );
   }
}

Result:

The above code sample will produce the following result.

today is Mon Jun 22 02:44:36 IST 2009
date after a month will be Thu Oct 22 02:44:36 IST 2009
date after 7 hrs will be Thu Oct 22 00:44:36 IST 2009


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