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Java program to create the clone of a HashSet collection

Java example to create the clone of a HashSet collection.
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 create a clone of created HashSet using the clone() method. The clone() method created the shallow copy of a HashSet collection.

Program/Source Code:

The source code to create the clone of a HashSet collection is given below. The given program is compiled and executed successfully.

// Java program to create the clone of 
// the 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);

    HashSet < Integer > clone = (HashSet < Integer > ) nums.clone();

    System.out.println("Set items: ");
    Iterator < Integer > itr = nums.iterator();
    while (itr.hasNext()) {
      System.out.println(" " + itr.next());
    }

    System.out.println("Cloned Set items: ");
    Iterator < Integer > itr1 = clone.iterator();
    while (itr1.hasNext()) {
      System.out.println(" " + itr1.next());
    }
  }
}

Output:

Set items: 
 1
 2
 3
 4
Cloned Set items: 
 1
 2
 3
 4

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. And, we created a set nums to store integer data elements using HashSet collection. Then we cloned the nums HashSet and created a clone HashSet using the clone() method and printed both collections.

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