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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