如何将HashMap中的key替换为newMap的值？

Question

HashMap<String,String> map1 = new HashMap<String,String>(); 
map1.put("1","Russia"); 
map1.put("2","USA");

//从map2到map1或newMap中的键的值

HashMap<String,String> map2 = new HashMap<String,String>(); 
map2.put("1","Moskow"); 
map2.put("2","New York");

//如何将值重新放置到键？在新地图中

HashMap<String,String> newMap = new HashMap<String,String>(); 
newMap.put("New York","USA"); //key "2" from map1 & map2

Answer 1

你描述的方式，看起来是这样的

Set<String> kyes = map1.keySet();

for(String key: keys){
 String newKey = map2.get(key);
 String newValue = map1.get(key);
 newMap.put(newKey,newValue); 

}