AbstractSet hashCode() Method in Java with Examples

The AbstractSet.hashCode() method in Java AbstractSet is used to fetch the hash code value of a particular this AbstractSet. A set consists of a number of buckets to store the elements. Each bucket has a unique identity and when an element is inserted into a bucket, its hashcode is matched with the identifier of the bucket, and if its a match the element is stored successfully. This is how the hash code works.

Syntax:

AbstractSet.hashCode()

Parameters: The method does not accept any parameters.

Return Value: The method returns the hashcode value of the set.

Below programs are used to illustrate the working of AbstractSet.hashCode() Method:

Program 1:

// Java code to illustrate the hashCode() method

import java.util.*;

public class Abstract_Set_Demo {
    public static void main(String[] args)
    {

        // Creating an empty AbstractSet
        AbstractSet<String>
            abs_set = new HashSet<String>();

        // Adding elements into the set
        abs_set.add("Geeks");
        abs_set.add("4");
        abs_set.add("Geeks");
        abs_set.add("Welcomes");
        abs_set.add("You");

        // Displaying the AbstractSet
        System.out.println("Initial Set is: "
                           + abs_set);

        // Getting the hashcode value for the set
        System.out.println("The hashcode value of the set: "
                           + abs_set.hashCode());
    }
}

Output:

Initial Set is: [4, Geeks, You, Welcomes]
The hashcode value of the set-295204749

Program 2:

// Java code to illustrate the hashCode() method

import java.util.*;

public class Abstract_Set_Demo {
    public static void main(String[] args)
    {

        // Creating an empty AbstractSet
        AbstractSet<Integer>
            abs_set = new TreeSet<Integer>();

        // Adding elements into the set
        abs_set.add(15);
        abs_set.add(20);
        abs_set.add(30);
        abs_set.add(40);
        abs_set.add(50);

        // Displaying the AbstractSet
        System.out.println("Initial Set is: "
                           + abs_set);

        // Getting the hashcode value for the set
        System.out.println("The hashcode value of the set: "
                           + abs_set.hashCode());
    }
}

Output:

Initial Set is: [15, 20, 30, 40, 50]
The hashcode value of the set: 155

Note: The same operation can be performed with any type of Set with variation and combination of different data types.