Java Map. Putall() method: append another map object to the current map collection
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Java
putAll(Mapm)
Typical application
public static void main(String[] args){ Map map1 = new HashMap(); //定义Map集合对象 map1.put("apple","新鲜的苹果"); //向集合中添加对象 map1.put("computer","配置优良的计算机"); map1.put("book","堆积成山的图书"); System.out.println("第一个Map集合大小为:"+map1.size()) //输出集合长度 Map map2 = new HashMap(); //定义Map集合map2 map2.put("apple2","新鲜的苹果"); //向集合中添加对象 map2.put("computer2","配置优良的计算机"); map2.put("book","堆积成山的图书"); System.out.println("第二个Map集合大小为:"+map2.size()); //输出集合长度 System.out.println("把第二个Map集合添加到第一个Map集合中"); map1.putAll(map2); //将map2中的对象添加到map1中 System.out.println("整合后的第一个Map集合大小为:"+map1.size()); }
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