The java.util.GregorianCalendar.equals() method is an in-built function in Java which checks for equality between this GregorianCalendar instance and the Object passed as parameter to the function. It returns true only if the specified Object is a GregorianCalendar object with same time value (millisecond offset from the Epoch) as this GregorianCalendar instance.
Syntax:
public boolean equals(Object obj)
Parameters: The function accepts a single mandatory parameter obj which is to be compared with this GregorianCalendar instance.
Return Values: This method returns true only when the specified Object is a GregorianCalendar object and has the same time value (millisecond offset from the Epoch) as this instance and returns false otherwise.
Examples:
Input : c1 = Mon Jul 23 23:46:14 UTC 2018, c2 = Mon Jul 23 23:46:14 UTC 2018 Output : true Input : c1 = Mon Jul 23 23:46:14 UTC 2018, c2 = Sun Jul 24 00:02:52 UTC 2022 Output : false
Below programs illustrate the java.util.GregorianCalendar.equals() function:
Program 1:
Java
// Java Program to illustrate the equals() function// of GregorianCalendar classimport java.io.*;import java.util.*;class GFG { public static void main(String[] args) { // Create a new calendar GregorianCalendar c1 = (GregorianCalendar) GregorianCalendar.getInstance(); // Display the current date and time System.out.println("Current Date and Time : " + c1.getTime()); // Create a second calendar equal to first one GregorianCalendar c2 = (GregorianCalendar)(Calendar)c1.clone(); // Compare the two calendars System.out.println("Both calendars are equal:" + c1.equals(c2)); // Adding 15 months to second calendar c2.add(GregorianCalendar.MONTH, 15); // Display the current date and time System.out.println("Modified Date and Time : " + c2.getTime()); // Compare the two calendars System.out.println("Both calendars are equal:" + c1.equals(c2)); }} |
Current Date and Time : Fri Jul 27 12:05:05 UTC 2018 Both calendars are equal:true Modified Date and Time : Sun Oct 27 12:05:05 UTC 2019 Both calendars are equal:false
Program 2:
Java
// Java Program to illustrate the equals() function// of GregorianCalendar classimport java.io.*;import java.util.*;class GFG { public static void main(String[] args) { // Create a new calendar GregorianCalendar c1 = (GregorianCalendar) GregorianCalendar.getInstance(); // Display the current date and time System.out.println("Current Date and Time : " + c1.getTime()); // Create a second calendar equal to first one GregorianCalendar c2 = (GregorianCalendar)(Calendar)c1.clone(); // Compare the two calendars System.out.println("Both calendars are equal:" + c1.equals(c2)); // Changing the Time Zone of c2 c2.setTimeZone(TimeZone.getTimeZone("CST")); // Compare the two calendars System.out.println("Both calendars are equal:" + c1.equals(c2)); }} |
Current Date and Time : Fri Jul 27 12:05:08 UTC 2018 Both calendars are equal:true Both calendars are equal:false
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/GregorianCalendar.html#equals()