Calendar isSet() Method in Java with Examples

The isSet(int calndr_field) method in Calendar class is used to check whether the given calendar field has a value set or not. All the Cases for which the values have been set by the calculations of the internal field are triggered by a get method call.

Syntax:

public final boolean isSet(int calndr_field)

Parameters: The method takes one parameter calndr_field that refers to the calendar field which is to be operated upon.
Return Value: The method either returns True if the value of the calendar field is set else it returns False.

Below programs illustrate the working of isSet() Method of Calendar class:

Example 1:

Java

// Java code to illustrate
// isSet() method

import java.util.*;
public class CalendarDemo {
    public static void main(String args[])
    {

        // Creating a calendar object
        Calendar calndr = Calendar.getInstance();

        // Displaying the calendar object
        System.out.println("The Year is: "
                           + calndr.get(Calendar.YEAR));

        // Querying for the value if set or not
        boolean val = calndr.isSet(Calendar.YEAR);
        System.out.println("Is the"
                           + " Value set? " + val);

        // Clearing the instance
        calndr.clear(Calendar.YEAR);

        // Performing isSet() operation
        val = calndr.isSet(Calendar.YEAR);
        System.out.println("Is the"
                           + " Value set? " + val);
    }
}

Output:

The Year is: 2019
Is the Value set? true
Is the Value set? false

Example 2:

Java

// Java code to illustrate
// isSet() method

import java.util.*;
public class CalendarDemo {
    public static void main(String args[])
    {

        // Creating a calendar object
        Calendar calndr = Calendar.getInstance();

        // Displaying the calendar object
        System.out.println("Todays Day is: "
                           + calndr.get(
                                 Calendar.DAY_OF_MONTH));

        // Querying for the value if set or not
        boolean val
            = calndr.isSet(Calendar.DAY_OF_MONTH);
        System.out.println("Is the"
                           + " Value set? " + val);

        // Clearing the instance
        calndr.clear(Calendar.DAY_OF_MONTH);

        // Performing isSet() operation
        val = calndr.isSet(Calendar.DAY_OF_MONTH);
        System.out.println("Is the"
                           + " Value set? " + val);
    }
}

Output:

Todays Day is: 21
Is the Value set? true
Is the Value set? false

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/Calendar.html#isSet-int-