java.util.WeakHashMap.values() 方法

package com.codingdict;
import java.util.*;


public class WeakHashMapDemo {
   public static void main(String[] args) {
      Map<String, String> weakHashMap = new WeakHashMap<String, String>();

      // put keys and values in the Map
      System.out.println("Putting values into the Map");
      weakHashMap.put("1", "first");
      weakHashMap.put("2", "two");
      weakHashMap.put("3", "three");

      // checking the size of the Map
      System.out.println("Map values: "+weakHashMap);  

      Collection col = weakHashMap.values();
      System.out.println("Collection values: "+col);  
   }      
}