AbstractSet equals() Method in Java with Examples

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