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()
