TreeSet hashCode() method in Java with Example

The hashCode() method of TreeSet in Java is used to get the hashCode value for this instance of the TreeSet. It returns an integer value which is the hashCode value for this instance of the TreeSet.

Syntax:

public int hashCode()

Parameters: This function has no parameters.

Returns: The method returns an integer value which is the hashCode value for this instance of the TreeSet.

Below examples illustrates the TreeSet.hashCode() method:

Example 1:

// Java code to demonstrate the working of
// hashCode() method in TreeSet

import java.util.*;

public class GFG {
    public static void main(String[] args)
    {
        // creating an TreeSet
        TreeSet<Integer> LHS
            = new TreeSet<Integer>();

        // using add() to initialize values
        // [1, 2, 3, 4]
        LHS.add(1);
        LHS.add(2);
        LHS.add(3);
        LHS.add(4);

        // print TreeSet
        System.out.println("TreeSet: "
                           + LHS);

        // Get the hashCode value
        // using hashCode() value
        System.out.println("HashCode value: "
                           + LHS.hashCode());
    }
}

Output:

TreeSet: [1, 2, 3, 4]
HashCode value: 10

Example 2:

// Java code to demonstrate the working of
// hashCode() method in TreeSet

import java.util.*;

public class GFG {
    public static void main(String[] args)
    {
        // creating an TreeSet
        TreeSet<String> LHS
            = new TreeSet<String>();

        // using add() to initialize values
        // [Geeks, For, ForGeeks, GeeksForGeeks]
        LHS.add("Geeks");
        LHS.add("For");
        LHS.add("ForGeeks");
        LHS.add("GeeksForGeeks");

        // print TreeSet
        System.out.println("TreeSet: "
                           + LHS);

        // Get the hashCode value
        // using hashCode() value
        System.out.println("HashCode value: "
                           + LHS.hashCode());
    }
}

Output:

TreeSet: [For, ForGeeks, Geeks, GeeksForGeeks]
HashCode value: -482506029