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Java IdentityHashMap equals() Method with Example

IdentityHashMap Class equals() method: Here, we are going to learn about the equals() method of IdentityHashMap Class with its syntax and example.
Submitted by Preeti Jain, on March 06, 2020

IdentityHashMap Class equals() method

• equals() method is available in java.util package.
• equals() method is used to check whether this IdentityHashMap object and the given object (ob) are equals or not.
• equals() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• equals() method does not throw an exception at the time of checking the equality of two objects.

Syntax:

    public boolean equals(Object ob);

Parameter(s):

• Object ob – represents the object to be checked for equality with this IdenityHashMap.

Return value:

The return type of the method is Set, it returns true when this IdentityHashMap and the given object are same otherwise it returns false.

Example:

// Java program to demonstrate the example 
// of equals(Object ob) method of IdentityHashMap 

import java.util.*;

public class EqualsOfIdentityHashMap {
    public static void main(String[] args) {
        // Instantiates a IdentityHashMap object
        Map < Integer, String > map1 = new IdentityHashMap < Integer, String > ();
        Map < Integer, String > map2 = new IdentityHashMap < Integer, String > ();

        // By using put() method is to add
        // key-value pairs in a IdentityHashMap
        // map1
        map1.put(10, "C");
        map1.put(20, "C++");
        map1.put(50, "JAVA");
        map1.put(40, "PHP");
        map1.put(30, "SFDC");

        // By using put() method is to add
        // key-value pairs in a IdentityHashMap
        // map2
        map2.put(10, "SQL");
        map2.put(20, "DBMS");


        // Display IdentityHashMap
        System.out.println("map1: " + map1);
        System.out.println("map2: " + map2);

        // By using using equals() method is to
        // compare two object for equality check

        boolean status = map1.equals(map2);

        // Display status
        System.out.print("map1.equals(map2): " + status);
    }
}

Output

map1: {20=C++, 40=PHP, 50=JAVA, 30=SFDC, 10=C}
map2: {20=DBMS, 10=SQL}
map1.equals(map2): false