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Java HashSet isEmpty() Method with Example

HashSet Class isEmpty() method: Here, we are going to learn about the isEmpty() method of HashSet Class with its syntax and example.
Submitted by Preeti Jain, on March 05, 2020

HashSet Class isEmpty() method

• isEmpty() method is available in java.util package.
• isEmpty() method is used to test whether this HashSet is empty (i.e. contains no elements) or not empty.
• isEmpty() method is a non-static method, it is accessible with the class object only, and if we try to access the method with the class name then we will get an error.
• isEmpty() method does not throw an exception at the time of checking the empty status of this HashSet.

Syntax:

    public boolean isEmpty();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is boolean, it returns true when this HashSet is empty otherwise it returns false.

Example:

// Java program to demonstrate the example 
// of boolean isEmpty () method of HashSet 

import java.util.*;

public class IsEmptyOfHashSet {
    public static void main(String[] args) {
        // Instantiates a HashSet object
        HashSet < String > hs = new HashSet < String > ();

        // By using add() method is to add
        // the given object of this
        // HashSet 
        hs.add("C");
        hs.add("C++");
        hs.add("JAVA");
        hs.add("PHP");
        hs.add("SFDC");

        // Display HashSet
        System.out.println("HashSet: " + hs);

        // By using isEmpty() method is
        // to check whether this HashSet is
        // empty or not
        boolean status = hs.isEmpty();

        // Display status
        System.out.println("hs.isEmpty(): " + status);
    }
}

Output

HashSet: [JAVA, C++, C, SFDC, PHP]
hs.isEmpty(): false