Java: Convert a hash set to an array

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

7. Convert HashSet to Array

Write a Java program to convert a hash set to an array.

Sample Solution:

Java Code:

import java.util.*;
  public class Exercise7 {
  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);
      // Creating an Array
      String[] new_array = new String[h_set.size()];
      h_set.toArray(new_array);
 
     // Displaying Array elements
     System.out.println("Array elements: ");
      for(String element : new_array){
        System.out.println(element);
     }
   }
}

Sample Output:

Original Hash Set: [Red, White, Pink, Yellow, Black, Green]            
Array elements:                                                        
Red                                                                    
White                                                                  
Pink                                                                   
Yellow                                                                 
Black                                                                  
Green

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to convert a HashSet of integers to an array and then sort the array.
• Write a Java program to convert a HashSet to an array using the toArray() method and then search for a specific element in the array.
• Write a Java program to convert a HashSet to an array and then iterate over it using a for-each loop.
• Write a Java program to convert a HashSet to an array, then compute and print the sum of its elements.

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