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Calendar computeFields() method in Java with Examples

  • Last Updated : 14 Feb, 2019

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

Note: This allows syncing up the new time that is set for the calendar object with the calendar field values.

Syntax:

protected abstract void computeFields()

Parameters: The method does not take any parameters.

Return Value: The method does not return any value.



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




// Java Code to illustrate
// computeFields() 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
        // computeFields()
        calndr.set(GregorianCalendar.YEAR, 2016);
        calndr.computeFields();
  
        // Displaying the current date
        System.out.println("The recent"
                           + " date is: " + calndr.getTime());
    }
}
Output:
The Current date is: Wed Feb 13 16:15:15 UTC 2019
The recent date is: Wed Feb 13 16:15:15 UTC 2019

Example 2:




// Java Code to illustrate
// computeFields() 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
        // computeFields()
        calndr.set(GregorianCalendar.YEAR, 2000);
        calndr.computeFields();
  
        // Displaying the current date
        System.out.println("The recent"
                           + " date is: " + calndr.getTime());
    }
}
Output:
The Current date is: Wed Feb 13 16:15:18 UTC 2019
The recent date is: Wed Feb 13 16:15:18 UTC 2019

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

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