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Java GregorianCalendar computeFields() Method with Example

GregorianCalendar Class computeFields() method: Here, we are going to learn about the computeFields() method of GregorianCalendar Class with its syntax and example.
Submitted by Preeti Jain, on February 15, 2020

GregorianCalendar Class computeFields() method

• computeFields() method is available in java.util package.
• computeFields() method is used to compute the calendar fields and as we know that to compute the time again and then calendar fields and then call complete() method.
• computeFields() method is a non-static method, it is accessible with class object only and if we try to access the method with class name then we will get an error.
• computeFields() method does not throw an exception at the time of computing fields.

Syntax:

    protected void computeFields();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of this method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void computeFields() method of 
// GregorianCalendar 

import java.util.*;

public class ComputeFieldOfGregorianCalendar extends GregorianCalendar {
    public static void main(String[] args) {
        // Instantiating a ComputeFieldOfGregorianCalendar object
        ComputeFieldOfGregorianCalendar ca = new ComputeFieldOfGregorianCalendar();

        // Display current ComputeFieldOfGregorianCalendar
        System.out.println("ca: " + ca.getTime());

        // By using clear(int fi) method to set the
        // field unset
        ca.clear(GregorianCalendar.MONTH);

        // Display calendar
        System.out.println("ca.clear(GregorianCalendar.MONTH): " + ca.getTime());

        // By using set() method is to set a month 
        //and invoke computeFields()
        ca.set(GregorianCalendar.MONTH, 6);
        ca.computeFields();

        // Display calendar
        System.out.println("ca.set(GregorianCalendar.MONTH,6): " + ca.getTime());
    }
}

Output

ca: Sat Feb 15 07:17:20 GMT 2020
ca.clear(GregorianCalendar.MONTH): Wed Jan 15 07:17:20 GMT 2020
ca.set(GregorianCalendar.MONTH,6): Wed Jan 15 07:17:20 GMT 2020