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-
