SortedMap equals() method in Java with Examples

Last Updated : 30 Sep, 2019

The equals() method in SortedMap Java is used to check for equality between two SortedMap instances. It verifies whether the elements of one SortedMap passed as a parameter is equal to the elements of this SortedMap 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.

Note: The equals() method in SortedMap is inherited from the Map interface in Java.

Below programs illustrate the equals() method:

Program 1:

// Java code to illustrate 
// the equals() method 
  
import java.util.*; 
  
public class Map_Demo { 
    public static void main(String[] args) 
    { 
  
        // Creating an empty SortedMap 
        SortedMap<Integer, String> map1 
            = new TreeMap<Integer, String>(); 
        SortedMap<Integer, String> map2 
            = new TreeMap<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)); 
    } 
} 

Output:

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

Program 2:

// Java code to illustrate 
// the equals() method 
  
import java.util.*; 
  
public class Map_Demo { 
    public static void main(String[] args) 
    { 
  
        // Creating an empty SortedMap 
        SortedMap<Integer, String> map1 
            = new TreeMap<Integer, String>(); 
        SortedMap<Integer, String> map2 
            = new TreeMap<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)); 
    } 
} 

Output:

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

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

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