Java WeakHashMap.keySet()

public Set <K> keySet()

/*from  w  w w.  ja  va  2  s.c o  m*/

import java.util.Map;
import java.util.WeakHashMap;
import java.util.Set;

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");
      
      // printing the contents of the Map
      System.out.println("Contents of the Map");
      System.out.println(weakHashMap);
      
      // populating the set
      Set set = weakHashMap.keySet();
      System.out.println("Contents of the set");
      System.out.println(set);
   }     
}