Java Collection Tutorial - Java WeakHashMap.isEmpty()


WeakHashMap.isEmpty() has the following syntax.

public boolean isEmpty()


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

import java.util.Map;
import java.util.WeakHashMap;
/*from   w  w  w  .j  a  v  a2s  . com*/
public class Main {
   public static void main(String[] args) { 
      Map<String, String>  weakHashMap = new WeakHashMap<String, String> ();
      // check map contents
      System.out.println("Checking the map entries");
      System.out.println("Map is empty: "+weakHashMap.isEmpty());
      System.out.println("Putting values into the Map");
      weakHashMap.put("1", "first");
      weakHashMap.put("2", "two");
      weakHashMap.put("3", "from");
      // checking Map
      System.out.println("Map is empty: "+weakHashMap.isEmpty());

The code above generates the following result.