IdentityHashMap equals() Method in Java

The java.util.IdentityHashMap.equals() method in Java is used to check for equality between two maps. It verifies whether the elements of one map passed as a parameter is equal to the elements of this map or not.

Syntax:

ihashmap1.equals(ihashmap2)

Parameters: The method accepts one parameter ihashmap2 of identity hash map type and refers to the map whose equality is to be checked with this hash map.

Return Value: The method returns true if the equality holds for both the object map else it returns false.

Below programs illustrate the working of java.util.IdentityHashMap.equals() method:
Program 1:

// Java code to illustrate the equals() method 
import java.util.*; 
  
public class Identity_Hash_Map_Demo { 
    public static void main(String[] args) 
    { 
  
        // Creating an empty IdentityHashMap 
        IdentityHashMap<Integer, String> identity_hash1 =  
                   new IdentityHashMap<Integer, String>(); 
        IdentityHashMap<Integer, String> identity_hash2 =  
                   new IdentityHashMap<Integer, String>(); 
  
        // Mapping string values to int keys 
        identity_hash1.put(10, "Beginner"); 
        identity_hash1.put(15, "4"); 
        identity_hash1.put(20, "Beginner"); 
        identity_hash1.put(25, "Welcomes"); 
        identity_hash1.put(30, "You"); 
          
        // Mapping string values to int keys 
        identity_hash2.put(10, "Beginner"); 
        identity_hash2.put(15, "4"); 
        identity_hash2.put(20, "Beginner"); 
        identity_hash2.put(25, "Welcomes"); 
        identity_hash2.put(30, "You"); 
  
        // Displaying the IdentityHashMap 
        System.out.println("First Map: "
                        + identity_hash1); 
  
        // Displaying the final IdentityHashMap 
        System.out.println("Second Map: "
                        + identity_hash2); 
                          
        // Displaying the equality 
        System.out.println("Equality: "+ 
                  identity_hash1.equals(identity_hash2)); 
    } 
} 

Output:

First Map: {10=Beginner, 30=You, 20=Beginner, 25=Welcomes, 15=4}
Second Map: {10=Beginner, 30=You, 20=Beginner, 25=Welcomes, 15=4}
Equality: true

Program 2:

// Java code to illustrate the equals() method 
import java.util.*; 
  
public class Identity_Hash_Map_Demo { 
    public static void main(String[] args) 
    { 
  
        // Creating an empty IdentityHashMap 
        IdentityHashMap<Integer, String> identity_hash1 =  
                   new IdentityHashMap<Integer, String>(); 
        IdentityHashMap<Integer, String> identity_hash2 =  
                   new IdentityHashMap<Integer, String>(); 
  
        // Mapping string values to int keys 
        identity_hash1.put(10, "Beginner"); 
        identity_hash1.put(15, "4"); 
        identity_hash1.put(20, "Beginner"); 
        identity_hash1.put(25, "Welcomes"); 
        identity_hash1.put(30, "You"); 
          
        // Mapping string values to int keys 
        identity_hash2.put(10, "Beginner"); 
        identity_hash2.put(15, "4"); 
        identity_hash2.put(20, "Geek"); 
        identity_hash2.put(25, "Welcomes"); 
        identity_hash2.put(30, "You"); 
  
        // Displaying the IdentityHashMap 
        System.out.println("First Map: "
                        + identity_hash1); 
  
        // Displaying the final IdentityHashMap 
        System.out.println("Second Map: "
                        + identity_hash2); 
                          
        // Displaying the equality 
        System.out.println("Equality: "+ 
                  identity_hash1.equals(identity_hash2)); 
    } 
} 

Output:

First Map: {10=Beginner, 30=You, 20=Beginner, 25=Welcomes, 15=4}
Second Map: {10=Beginner, 30=You, 20=Geek, 25=Welcomes, 15=4}
Equality: false

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