如何將 HashMap 中的鍵替換為 newMap 中的值？

Question

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

//map2中的值到map1或newMap中的鍵

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

//如何將值替換為鍵？ 在新 Map

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

Answer 1

你描述它的方式，它看起來像這樣

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

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

}