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

// 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

// 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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