Calendar clear() Method in Java with Examples

The clear() method in Calendar class is used to set all the calendar field values and the time value of this Calendar undefined.
Note: Implementation of calendar class may use default field values for date and time calculations.

Syntax:

public final void clear()

Parameters: The method does not take any parameters.

Return Value: The method does not return any value.

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

// Java Code to illustrate clear() Method

import java.util.Calendar;

public class CalendarClassDemo {
    public static void main(String args[])
    {
        // Creating a calendar object
        Calendar calndr = Calendar.getInstance();

        // Displaying the Current Date
        System.out.println("Current Date&Time: "
                           + calndr.getTime());

        // Clear method for undefining the values
        // of the calendar
        calndr.clear();

        // Displaying the final result
        System.out.println("After clear method: "
                           + calndr.getTime());
    }
}

Output:

Current Date&Time: Tue Feb 12 13:01:42 UTC 2019
After clear method: Thu Jan 01 00:00:00 UTC 1970

Example 2:

// Java Code to illustrate clone() Method

import java.util.*;

public class CalendarClassDemo {
    public static void main(String args[])
    {
        // Creating a calendar object
        Calendar calndr1 = new GregorianCalendar(2018, 12, 2);

        // Displaying current calendar
        System.out.println("Original calendar: "
                           + calndr1.getTime());

        // Clear method for undefining the values
        // of the calendar
        calndr1.clear();

        // Displaying the final result
        System.out.println("After clear method: "
                           + calndr1.getTime());
    }
}

Output:

Original calendar: Wed Jan 02 00:00:00 UTC 2019
After clear method: Thu Jan 01 00:00:00 UTC 1970

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#clear()