java hashset contains class => code example

Example 1: HashSet contains(Object o) method in java

import java.util.HashSet;
public class HashSetContainsObjectMethodExample
{
   public static void main(String[] args)
   {
      HashSet<String> hs = new HashSet<String>();
      hs.add("hello");
      hs.add("world");
      hs.add("java");
      // check if element exists
      boolean bool = hs.contains("world");
      System.out.println("Is element 'world' exists: " + bool);
   }
}

Example 2: hashset contains java

HashSet<Integer> set = new HashSet<Integer>();      
set.contains(110)//public boolean contains(Object o)