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Java program to check whether a HashSet contains a specified item or not

Java example to check whether a HashSet contains a specified item 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 contains a specified item or not using contains() method.

Program/Source Code:

The source code to check a HashSet contains a specified item or not is given below. The given program is compiled and executed successfully.

// Java program to check whether a HashSet contains 
// a specified item or not

import java.util.*;

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

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

    if (nums.contains(2))
      System.out.println("Item 2 found in the HashSet.");
    else
      System.out.println("Item 2 did not find in the HashSet.");

    if (nums.contains(20))
      System.out.println("Item 20 found in the HashSet.");
    else
      System.out.println("Item 20 did not find in the HashSet.");
  }
}

Output:

Item 2 found in the HashSet.
Item 20 did not find in the HashSet.

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 nums HashSet contains specified items using contains() method and printed the appropriate message.

The contains() method returns true if the specified item is found in the HashSet, otherwise, it returns false.

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