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Java program to remove an item from HashSet collection

Java example to remove an item from HashSet collection.
Submitted by Nidhi, on May 10, 2022

Problem statement

Given a HashSet collection, we have to remove an item from HashSet collection.

Source Code

The source code to remove an item from HashSet collection is given below. The given program is compiled and executed successfully.

// Java program to remove an item from 
// HashSet collection

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);
    nums.add(5);
    nums.add(6);

    System.out.println("Set elements: " + nums);

    if (nums.remove(5)) //return true on successful removal.
      System.out.println("Item 5 removed from 'nums' Set successfully.");
    else
      System.out.println("Item 5 is not removed from 'nums' Set.");

    System.out.println("Set elements after removing item 5: " + nums);
  }
}

Output

Set elements: [1, 2, 3, 4, 5, 6]
Item 5 removed from 'nums' Set successfully.
Set elements after removing item 5: [1, 2, 3, 4, 6]

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 added some elements to the set using add() method. After that, we removed item 5 from the HashSet collection using the remove() method and printed the updated set.

The remove() method returns true on successful removal of a specified item, otherwise, it returns false.

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