[英]how replace key from HashMap to values in newMap?
HashMap<String,String> map1 = new HashMap<String,String>();
map1.put("1","Russia");
map1.put("2","USA");
//map2中的值到map1或newMap中的键
HashMap<String,String> map2 = new HashMap<String,String>();
map2.put("1","Moskow");
map2.put("2","New York");
//如何将值替换为键? 在新 Map
HashMap<String,String> newMap = new HashMap<String,String>();
newMap.put("New York","USA"); //key "2" from map1 & map2
你描述它的方式,它看起来像这样
Set<String> kyes = map1.keySet();
for(String key: keys){
String newKey = map2.get(key);
String newValue = map1.get(key);
newMap.put(newKey,newValue);
}
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