AbstractMap equals() Method in Java with Examples

The AbstractMap.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:

AbstractMap1.equals(AbstractMap2)

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

Program 1:

// Java code to illustrate the equals() method
import java.util.*;

public class Abstract_Map_Demo {
    public static void main(String[] args)
    {

        // Creating an empty AbstractMap
        AbstractMap<Integer, String>
            abstract_hash1 = new IdentityHashMap<Integer, String>();

        AbstractMap<Integer, String>
            abstract_hash2 = new IdentityHashMap<Integer, String>();

        // Mapping string values to int keys
        abstract_hash1.put(10, "Geeks");
        abstract_hash1.put(15, "4");
        abstract_hash1.put(20, "Geeks");
        abstract_hash1.put(25, "Welcomes");
        abstract_hash1.put(30, "You");

        // Mapping string values to int keys
        abstract_hash2.put(10, "Geeks");
        abstract_hash2.put(15, "4");
        abstract_hash2.put(20, "Geeks");
        abstract_hash2.put(25, "Welcomes");
        abstract_hash2.put(30, "You");

        // Displaying the AsbstractMap
        System.out.println("First Map: "
                           + abstract_hash1);

        // Displaying the final AbstractMap
        System.out.println("Second Map: "
                           + abstract_hash2);

        // Displaying the equality
        System.out.println("Equality: "
                           + abstract_hash1.equals(abstract_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 Abstract_Map_Demo {
    public static void main(String[] args)
    {

        // Creating an empty AbstractMap
        AbstractMap<Integer, String>
            abstract_hash1 = new IdentityHashMap<Integer, String>();

        AbstractMap<Integer, String>
            abstract_hash2 = new IdentityHashMap<Integer, String>();

        // Mapping string values to int keys
        abstract_hash1.put(10, "Geeks");
        abstract_hash1.put(15, "4");
        abstract_hash1.put(20, "Geeks");
        abstract_hash1.put(25, "Welcomes");
        abstract_hash1.put(30, "You");

        // Mapping string values to int keys
        abstract_hash2.put(10, "Geeks");
        abstract_hash2.put(15, "4");
        abstract_hash2.put(20, "Geek");
        abstract_hash2.put(25, "Welcomes");
        abstract_hash2.put(30, "You");

        // Displaying the IdentityHashMap
        System.out.println("First Map: "
                           + abstract_hash1);

        // Displaying the final IdentityHashMap
        System.out.println("Second Map: "
                           + abstract_hash2);

        // Displaying the equality
        System.out.println("Equality: "
                           + abstract_hash1.equals(abstract_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