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IdentityHashMap equals() Method in Java

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  • Last Updated : 24 Jul, 2018
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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, "Geeks");
        identity_hash1.put(15, "4");
        identity_hash1.put(20, "Geeks");
        identity_hash1.put(25, "Welcomes");
        identity_hash1.put(30, "You");
          
        // Mapping string values to int keys
        identity_hash2.put(10, "Geeks");
        identity_hash2.put(15, "4");
        identity_hash2.put(20, "Geeks");
        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=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
Second Map: {10=Geeks, 30=You, 20=Geeks, 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, "Geeks");
        identity_hash1.put(15, "4");
        identity_hash1.put(20, "Geeks");
        identity_hash1.put(25, "Welcomes");
        identity_hash1.put(30, "You");
          
        // Mapping string values to int keys
        identity_hash2.put(10, "Geeks");
        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=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
Second Map: {10=Geeks, 30=You, 20=Geek, 25=Welcomes, 15=4}
Equality: false

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