Java Collection, HashSet Exercises: Remove all of the elements from a hash set

Java Collection, HashSet Exercises: Exercise-12 with Solution

Write a Java program to remove all of the elements from a hash set.

Sample Solution:

Java Code:

import java.util.*;
  public class Exercise12 {
  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
           System.out.println("Original hash set contains: "+ h_set);
      //  clear() method removes all the elements from a hash set
      // and the set becomes empty.
     // Display original hash set content again
          System.out.println("HashSet content: "+h_set);

Sample Output:

Original hash set contains: [Red, White, Black, Green]                 
HashSet content: []

Pictorial Presentation:

Java Collection, ArrayList Exercises: Remove all of the elements from a hash set


Flowchart: Remove all of the elements from a hash set.

Java Code Editor:

Contribute your code and comments through Disqus.

Previous: Compare two sets and retain elements which are same on both sets.
Next: Create a new tree set, add some colors and print out the tree set.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

Share this Tutorial / Exercise on : Facebook and Twitter

Java: Tips of the Day


Converts to enum to Map where key is the name and value is Enum itself.

public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) {
    return Arrays.stream(enumClass.getEnumConstants())
            .collect(Collectors.toMap(Enum::name, Function.identity()));

Ref: https://bit.ly/3xXcFZt