Java WeakHashMap .containsValue (Object value)

public boolean containsValue(Object value)

//from w  w  w . j  av a  2 s .c o  m
import java.util.Map;
import java.util.WeakHashMap;

public class Main {
   public static void main(String[] args) { 
      Map<String, String>  weakHashMap = new WeakHashMap<String, String> ();
      
            
      weakHashMap.put("1", "first");
      weakHashMap.put("2", "two");
      weakHashMap.put("3", "from java2s.com");
      
      // check existence of value "from java2s.com"
      System.out.println("Checking value 'three'");
      System.out.println(weakHashMap.containsValue("from java2s.com"));
   }    
}