Check out example codes for "HashSet clear() method in java". It will help you in understanding the concepts better.

Code Example 1

import java.util.HashSet;
public class HashSetClearMethodExample
{
   public static void main(String[] args)
   {
      HashSet<String> hs = new HashSet<String>();
      hs.add("Welcome");
      hs.add("hello");
      hs.add("world");
      hs.add("core");
      hs.add("java");
      System.out.println("HashSet before using clear() method: " + hs);
      // HashSet clear() method
      hs.clear();
      System.out.println("HashSet after using clear() method: " + hs);
   }
}

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