Calendar computeTime() method in Java with Examples

The computeTime() method in Calendar class is used for the conversion operation of the current calendar field values in fields[] to the millisecond time value time.

Syntax:

protected abstract void computeTime()

Parameters: The method does not take any parameters.

Return Value: The method does not return any value.

Below programs illustrate the working of computeTime() Method of Calendar class:
Example 1:

// Java Code to illustrate
// computeTime() Method

import java.util.*;

public class CalendarClassDemo
    extends GregorianCalendar {
    public static void main(String args[])
    {
        // Creating calendar object
        CalendarClassDemo calndr = new CalendarClassDemo();

        // Displaying the current date
        System.out.println("The Current "
                           + "date is: " + calndr.getTime());

        // Clearing the calendar
        calndr.clear();

        // Set a new year and call
        // computeTime()
        calndr.set(GregorianCalendar.YEAR, 2016);
        calndr.computeTime();

        // Displaying the current date
        System.out.println("The recent"
                           + " date is: " + calndr.getTime());
    }
}

Output:

The Current date is: Wed Feb 13 16:27:12 UTC 2019
The recent date is: Fri Jan 01 00:00:00 UTC 2016

Example 2:

// Java Code to illustrate
// computeTime() Method

import java.util.*;

public class CalendarClassDemo
    extends GregorianCalendar {
    public static void main(String args[])
    {
        // Creating calendar object
        CalendarClassDemo calndr = new CalendarClassDemo();

        // Displaying the current date
        System.out.println("The Current "
                           + "date is: " + calndr.getTime());

        // Clearing the calendar
        calndr.clear();

        // Set a new year and call
        // computeTime()
        calndr.set(GregorianCalendar.YEAR, 2000);
        calndr.computeTime();

        // Displaying the current date
        System.out.println("The recent"
                           + " date is: " + calndr.getTime());
    }
}

Output:

The Current date is: Wed Feb 13 16:27:15 UTC 2019
The recent date is: Sat Jan 01 00:00:00 UTC 2000

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#computeTime()