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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.

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