The add(Calendar Calendar2) method of Calendar class is used to compare the time values or the millisecond offsets of this Calendar object with the passed Calendar object.
Syntax:
public int compareTo(Calendar Calendar2)
Parameters: The method takes one parameter Calendar2 of Calendar object type and refers to the object to be compared to this Calendar object.
Return Value: The method returns an integer value and can return any one of the following:
- The method returns 0 if the passed argument is equal to this Calendar object.
- The method returns 1 if the time of this Calendar object is more than the passed object.
- The method returns -1 if the time of this Calendar object is less than the passed object.
Below programs illustrate the working of compareTo() Method of Calendar class:
Example 1:
// Java Code to illustrate compareTo() Method  import java.util.*;  public class CalendarClassDemo {    public static void main(String args[])    {        // Creating a calendar object        Calendar calndr1            = Calendar.getInstance();          // Creating another calendar object        Calendar calndr2            = new GregorianCalendar(2018, 12, 2);          // Comparing the time        int val = calndr1.compareTo(calndr2);          // Displaying the result of comparison        System.out.println("First"                           + " comparison result is: "                           + val);          // Comparing the time        val = calndr2.compareTo(calndr1);          // Displaying the result of comparison        System.out.println("Second"                           + " comparison result is: "                           + val);    }} |
Output:
First comparison result is: 1 Second comparison result is: -1
Example 2:
// Java Code to illustrate compareTo() Method  import java.util.*;  public class CalendarClassDemo {    public static void main(String args[])    {        // Creating a calendar object        Calendar calndr1 = Calendar.getInstance();          // Creating another calendar object        Calendar calndr2 = Calendar.getInstance();          // Comparing the time        int val = calndr1.compareTo(calndr2);          // Displaying the result of comparison        System.out.println("The"                           + " comparison result is: "                           + val);    }} |
Output:
The comparison result is: -1
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#compareTo(java.util.Calendar)
