Java.util.EnumMap.putAll() 方法

package com.codingdict;

import java.util.*;

public class EnumMapDemo {

   // create an enum
   public enum Numbers {
      ONE, TWO, THREE, FOUR, FIVE
   };

   public static void main(String[] args) {

      EnumMap<Numbers, String> map1 =
         new EnumMap<Numbers, String>(Numbers.class);
      EnumMap<Numbers, String> map2 =
         new EnumMap<Numbers, String>(Numbers.class);

      // associate values in map1
      map1.put(Numbers.ONE, "1");
      map1.put(Numbers.TWO, "2");
      map1.put(Numbers.THREE, "3");
      map1.put(Numbers.FOUR, "4");

      // print the maps
      System.out.println("Map1: " + map1);
      System.out.println("Map2: " + map2);

      // put all mapping from map1 to map 2
      map2.putAll(map1);

      // print the maps
      System.out.println("Map1: " + map1);
      System.out.println("Map2: " + map2);
   }
}