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Java program to check whether a HashSet is empty or not

Java example to check whether a HashSet is empty or not.
Submitted by Nidhi, on May 09, 2022

Problem Solution:

In this program, we will create a set using the HashSet collection to store integer elements. Then we will check whether a HashSet is empty or not using the isEmpty() method.

Program/Source Code:

The source code to check whether a HashSet is empty or not is given below. The given program is compiled and executed successfully.

// Java program to check whether a HashSet 
// is empty or not

import java.util.*;

public class Main {
  public static void main(String[] args) {
    HashSet < Integer > nums = new HashSet();
    HashSet < Integer > nums1 = new HashSet();

    nums.add(1);
    nums.add(2);
    nums.add(3);
    nums.add(4);

    if (nums.isEmpty())
      System.out.println("The HashSet nums is an empty collection.");
    else
      System.out.println("The HashSet nums is not an empty collection.");

    if (nums1.isEmpty())
      System.out.println("The HashSet nums1 is an empty collection.");
    else
      System.out.println("The HashSet nums1 is not an empty collection.");
  }
}

Output:

The HashSet nums is not an empty collection.
The HashSet nums1 is an empty collection.

Explanation:

In the above program, we imported the "java.util.*" package to use the HashSet collection. Here, we created a public class Main that contains a main() method.

The main() method is the entry point for the program. Here, we created a set nums to store integer data elements using HashSet collection. Then we checked whether a HashSet is empty or not using the isEmpty() method and printed the appropriate message.

The isEmpty() method returns true if the HashSet is empty, otherwise, it returns false.

Java HashSet Programs »


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