Remove all elements from HashSet : HashSet « Collections « Java Tutorial

1. Java Tutorial
2. Collections
3. HashSet

import java.util.HashSet;

public class Main {
  public static void main(String[] args) {
    HashSet<Integer> hSet = new HashSet<Integer>();

    hSet.add(new Integer("1"));
    hSet.add(new Integer("2"));
    hSet.add(new Integer("3"));

    System.out.println(hSet);

    hSet.clear();

    System.out.println(hSet);

    System.out.println(hSet.isEmpty());

  }

}
/*
[1, 2, 3]
[]
true
*/