Java Collection Tutorial - Java WeakHashMap.entrySet()


WeakHashMap.entrySet() has the following syntax.

public Set <Map.Entry <K, V>> entrySet()


In the following code shows how to use WeakHashMap.entrySet() method.

//from w w w.j a v  a 2s.  c o m
import java.util.Map;
import java.util.Set;
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");
      // printing the Map
      System.out.println("Map: "+weakHashMap);
      // returns a Set view of the Map
      Set set=weakHashMap.entrySet();
      // printing the set
      System.out.println("Set: "+set);
      // change Map value
      weakHashMap.put("3", "new value");
      // print Map and set
      System.out.println("Changed Map: "+weakHashMap);
      System.out.println("Changed Set: "+set);

The code above generates the following result.