Java Hashmap containsValue() Method

import java.util.*;

public class Main
{
  public static void main (String[]args)
  {

    // Creating an empty HashMap
    HashMap < Integer, String > hash_map = new HashMap < Integer, String > ();

    // Mapping string values to int keys
    hash_map.put (10, "Java");
    hash_map.put (20, "Hashmap");
    hash_map.put (25, "containsValue");
    hash_map.put (30, "method");

    //checking if the value 'Java' is mapped or not
    System.out.println ("'Java' is mapped : " +
			hash_map.containsValue ("Java"));

    // checking if the value 'Python' is mapped or not
    System.out.println ("'Python' is mapped' : " +
			hash_map.containsValue ("Python"));


  }
}