OptionalLong equals() method in Java with examples

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)