OptionalLong help us to create an object which may or may not contain a Long value. The equals(Object obj) method help us to compare this OptionalLong object with the passed object as a parameter and it returns true if objects are equal.
The other object is considered equal to this OptionalLong if:
- it is also an OptionalLong and;
- both instances have no value present or;
- the present values are “equal to” each other via ==.
Syntax:
public boolean equals(Object obj)
Parameters: This method accepts an obj which is an object to be tested for equality.
Return value: This method returns true if the other object is “equal to” this object otherwise false.
Below programs illustrate equals(Object obj) method:
Program 1:
// Java program to demonstrate// OptionalLong.equals(Object obj) method import java.util.OptionalLong; public class GFG { public static void main(String[] args) { // Create first OptionalLong object OptionalLong opLong1 = OptionalLong.of(45213246); System.out.println("OptionalLong 1: " + opLong1.toString()); // Create second OptionalLong object OptionalLong opLong2 = OptionalLong.of(45213246); System.out.println("OptionalLong 2: " + opLong2.toString()); // Check if these two objects are equal // using equals(Object obj) System.out.println("Are both objects equal: " + opLong1.equals(opLong2)); }} |
Output:
OptionalLong 1: OptionalLong[45213246] OptionalLong 2: OptionalLong[45213246] Are both objects equal: true
Program 2:
// Java program to demonstrate// OptionalLong.equals(Object obj) method import java.util.OptionalLong; public class GFG { public static void main(String[] args) { // Create first OptionalLong object OptionalLong opLong1 = OptionalLong.of(317946492); System.out.println("OptionalLong 1: " + opLong1.toString()); // Create second OptionalLong object OptionalLong opLong2 = OptionalLong.of(45213246); System.out.println("OptionalLong 2: " + opLong2.toString()); // Check if these two objects are equal // using equals(Object obj) System.out.println("Are both objects equal: " + opLong1.equals(opLong2)); }} |
Output:
OptionalLong 1: OptionalLong[317946492] OptionalLong 2: OptionalLong[45213246] Are both objects equal: false
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalLong.html#equals?(Object obj)