Java WeakHashMap .containsKey (Object key)

public boolean containsKey(Object key)

//from  w  w w.  j a  va  2s  . c om
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 key value 
      System.out.println("Checking value for key 1");
      System.out.println(weakHashMap.containsKey("1"));
   }    
}