Java: Clone a hash set to another hash set

Last update on May 22 2025 13:14:31 (UTC/GMT +8 hours)

6. Clone HashSet

Write a Java program to clone a hash set to another hash set.

Sample Solution:

Java Code:

import java.util.*;

  public class Exercise6 {
  public static void main(String[] args) {
         // Create a empty hash set
     HashSet<String> h_set = new HashSet<String>();
   // use add() method to add values in the hash set
          h_set.add("Red");
          h_set.add("Green");
          h_set.add("Black");
          h_set.add("White");
          h_set.add("Pink");
          h_set.add("Yellow");
    System.out.println("Original Hash Set: " + h_set);
    HashSet <String> new_h_set = new HashSet <String> ();
          new_h_set = (HashSet)h_set.clone();
          System.out.println("Cloned Hash Set: " + new_h_set);         
   }
}

Sample Output:

Note: Exercise6.java uses unchecked or unsafe operations.              
Note: Recompile with -Xlint:unchecked for details.                     
Original Hash Set: [Red, White, Pink, Yellow, Black, Green]            
Cloned Hash Set: [Red, White, Pink, Yellow, Black, Green] 

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to clone a HashSet using the clone() method and verify that changes in the clone do not affect the original.
• Write a Java program to create a deep copy of a HashSet containing custom objects ensuring immutability of the clone.
• Write a Java program to duplicate a HashSet using Java streams and collect the elements into a new set.
• Write a Java program to compare the cloned HashSet with the original for equality after performing modifications.

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