AbstractSet equals() Method in Java with Examples

Last Updated : 26 Nov, 2018

The AbstractSet.equals() method in Java AbstractSet is used to check for equality between two sets. It verifies whether the elements of one set passed as a parameter is equal to the elements of this set or not.

Syntax:

AbstractSet1.equals(AbstractSet2)

Parameters: The method accepts one parameter AbstractSet2 of abstract set type and refers to the set whose equality is to be checked with this abstract set.

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

Below programs illustrate the working of AbstractSet.equals() method:

Program 1:

// Java code to illustrate the equals() method 
import java.util.*; 
  
public class Abstract_Set_Demo { 
    public static void main(String[] args) 
    { 
  
        // Creating an empty AbstractSet 
        AbstractSet<String> 
            abstract_set1 = new HashSet<String>(); 
        AbstractSet<String> 
            abstract_set2 = new HashSet<String>(); 
  
        // Adding elements to set 
        abstract_set1.add("Geeks"); 
        abstract_set1.add("4"); 
        abstract_set1.add("Geeks"); 
        abstract_set1.add("Welcomes"); 
        abstract_set1.add("You"); 
  
        // Adding elements to set 
        abstract_set2.add("Geeks"); 
        abstract_set2.add("4"); 
        abstract_set2.add("Geeks"); 
        abstract_set2.add("Welcomes"); 
        abstract_set2.add("You"); 
  
        // Displaying the first HashSet 
        System.out.println("First Set: "
                           + abstract_set1); 
  
        // Displaying the second HashSet 
        System.out.println("Second Set: "
                           + abstract_set2); 
  
        // Displaying the equality 
        System.out.println("Equality: "
                           + abstract_set1 
                                 .equals(abstract_set2)); 
    } 
} 

Output:

First Set: [4, Geeks, You, Welcomes]
Second Set: [4, Geeks, You, Welcomes]
Equality: true

Program 2:

// Java code to illustrate the equals() method 
import java.util.*; 
  
public class Abstract_Set_Demo { 
    public static void main(String[] args) 
    { 
  
        // Creating an empty AbstractSet 
        AbstractSet<String> 
            abstract_set1 = new HashSet<String>(); 
        AbstractSet<String> 
            abstract_set2 = new HashSet<String>(); 
  
        // Adding elements to set 
        abstract_set1.add("Geeks"); 
        abstract_set1.add("4"); 
        abstract_set1.add("Geeks"); 
        abstract_set1.add("Welcomes"); 
        abstract_set1.add("You"); 
  
        // Adding elements to set 
        abstract_set2.add("Geeks"); 
        abstract_set2.add("4"); 
        abstract_set2.add("Geeks"); 
        abstract_set2.add("Welcomes"); 
        abstract_set2.add("U"); 
  
        // Displaying the first HashSet 
        System.out.println("First Set: "
                           + abstract_set1); 
  
        // Displaying the second HashSet 
        System.out.println("Second Set: "
                           + abstract_set2); 
  
        // Displaying the equality 
        System.out.println("Equality: "
                           + abstract_set1 
                                 .equals(abstract_set2)); 
    } 
} 

Output:

First Set: [4, Geeks, You, Welcomes]
Second Set: [4, U, Geeks, Welcomes]
Equality: false

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