Java .isSet()

The .isSet() method is used to evaluate if a current field has a value or not. The return type is a Bool, and it returns true if the given field has a value set and false if it isn’t. It returns true when the given parameter has been set by internal field interpretations. isSet() belongs to the Calendar class and is a non-static method, it is accessible with the class object.

Syntax

result = myCalendar.isSet(calendar_field)

The method takes one parameter, calendar_field, that refers to the specific field to be operated upon.

The method either returns true if the value of the field is set, else it returns false.

Note: The Calendar class has been replaced by the LocalDate, LocalTime, and LocalDateTime classes in the Java 8 and later Date-Time API. These classes provide a more modern and user-friendly API for working with dates and times in Java.

Example

The following example shows the usage of java.util.calendar.isSet() method.

import java.util.*;

public class CalendarDemo {
  public static void main(String[] args) {

  // Create a calendar
    Calendar cal = Calendar.getInstance();

  // Display the current calendar
    System.out.println("Current Day is " + cal.get(Calendar.DAY_OF_MONTH));

  // Determine if the given calendar field has a value set
    boolean b = cal.isSet(Calendar.DAY_OF_MONTH);
    System.out.println("Day of month is set: " + b);

  // Clear day of month
    cal.clear(Calendar.DAY_OF_MONTH);

  // Determine if the given calendar field has a value set
    b = cal.isSet(Calendar.DAY_OF_MONTH);
    System.out.println("Day of month is set: " + b);
   }
}

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This code will return an output similar to the following:

Current Day is 6
Day of month is set: true
Day of month is set: false

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