w3resource
Java Exercises

Java Collection, HashSet Exercises: Empty an hash set

Java Collection, HashSet Exercises: Exercise-4 with Solution

Write a Java program to empty an hash set.

Sample Solution:

Java Code:

import java.util.*;

  public class Exercise4 {
  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);
    // Remove all elements
    h_set.removeAll(h_set);
    System.out.println("Hash Set after removing all the elements "+h_set);   
   }
}

Sample Output:

Original Hash Set: [Red, White, Pink, Yellow, Black, Green]            
Hash Set after removing all the elements [] 

Flowchart:

Flowchart: Empty an hash set.

Java Code Editor:

Contribute your code and comments through Disqus.

What is the difficulty level of this exercise?



New Content: Composer: Dependency manager for PHP, R Programming