How to Add or Subtract Years from a Date

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This code example shows how to add and remove years from a date using an instance of the Calendar class.
The method incrementYears takes two parameters, the Calendar object and the number of years to add.
The method decrementYears takes the same parameters and decrement the Calendar object with the number of years passed to it.
Note that the actuall call to the calendar is to the same method, add(), but when decrementing a negative value is passed.

The main method creates a Calendar object and print out the current date / time.
Then it instantiates a new Main object and call both methods with the calendar instance as parameter along with the number of years.

import java.util.Calendar;

/**
*
* @author www.javadb.com
*/
public class Main {

    public void incrementYears(Calendar cal, int years) {

        cal.add(Calendar.YEAR, years);
        System.out.println("Date after increment: " + cal.getTime());
    }

    public void decrementYears(Calendar cal, int years) {

        cal.add(Calendar.YEAR, years);
        System.out.println("Date after decrement: " + cal.getTime());

    }
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {

        Calendar cal = Calendar.getInstance();
        System.out.println("Now : " + cal.getTime());
        Main main = new Main();
        main.incrementYears(cal, 1);
        main.decrementYears(cal, -2);
    }
}

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