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Map equals() method in Java with Examples
  • Last Updated : 31 Dec, 2018

The java.util.Map.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:

boolean equals(object obj)

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

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

Below programs illustrate the java.util.Map.equals() method:
Program 1:



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// Java code to illustrate the equals() method
import java.util.*;
  
public class Map_Demo {
    public static void main(String[] args)
    {
        // Creating an empty Map
        Map<Integer, String> map1 = new HashMap<Integer, String>();
        Map<Integer, String> map2 = new HashMap<Integer, String>();
  
        // Mapping string values to int keys
        map1.put(10, "Geeks");
        map1.put(15, "4");
        map1.put(20, "Geeks");
        map1.put(25, "Welcomes");
        map1.put(30, "You");
  
        // Mapping string values to int keys
        map2.put(10, "Geeks");
        map2.put(15, "4");
        map2.put(20, "Geeks");
        map2.put(25, "Welcomes");
        map2.put(30, "You");
  
        // Displaying the Map1
        System.out.println("First Map: "
                           + map1);
  
        // Displaying the Map2
        System.out.println("Second Map: "
                           + map2);
  
        // Checking the equality
        System.out.println("Equality: " + map1.equals(map2));
    }
}

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Output:

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

Program 2:

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// Java code to illustrate the equals() method
import java.util.*;
  
public class Map_Demo {
    public static void main(String[] args)
    {
        // Creating an empty Map
        Map<Integer, String> map1 = new HashMap<Integer, String>();
        Map<Integer, String> map2 = new HashMap<Integer, String>();
  
        // Mapping string values to int keys for map1
        map1.put(10, "Geeks");
        map1.put(15, "4");
        map1.put(20, "Geeks");
        map1.put(25, "Welcomes");
        map1.put(30, "You");
  
        // Mapping string values to int keys for map2
        map2.put(10, "Geeks");
        map2.put(15, "4");
        map2.put(20, "Geek");
        map2.put(25, "Welcomes");
        map2.put(30, "You");
  
        // Displaying the map 1
        System.out.println("First Map: " + map1);
  
        // Displaying the map 2
        System.out.println("Second Map: " + map2);
  
        // Displaying the equality
        System.out.println("Equality: " + map1.equals(map2));
    }
}

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Output:

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

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Map.html#equals(java.lang.Object)

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