是否可以重命名Hashmap密钥？

I'm looking for a way to rename a Hashmap key, but i don't know if it's possible in Java.

我正在寻找一种重命名Hashmap密钥的方法，但我不知道它是否可以在Java中使用。

5 个解决方案

#1

Try to remove the element and put it again with the new name. Assuming the keys in your map are String, it could be achieved that way:

尝试删除元素并使用新名称再次添加。假设地图中的键是String，则可以通过以下方式实现：

Object obj = map.remove("oldKey");
map.put("newKey", obj);

#2

Assign the value of the key, which need to be renamed, to an new key. And remove the old key.

将需要重命名的密钥值分配给新密钥。并删除旧密钥。

hashMap.put("New_Key", hashMap.get("Old_Key"));
hashMap.remove("Old_Key");

#3

hashMap.put("New_Key", hashMap.remove("Old_Key"));

This will do what you want but, you will notice that the location of the key has changed.

这将做你想要的，但你会注意到键的位置已经改变。

#4

You don't rename a hashmap key, you have to insert a new entry with the new key and delete the old one.

您不重命名hashmap键，您必须使用新键插入新条目并删除旧键。

#5

You cannot rename/modify the hashmap key once added.

添加后，您无法重命名/修改hashmap键。

Only way is to delete/remove the key and insert the new key and value pair.

唯一的方法是删除/删除密钥并插入新的密钥和值对。

Reason : In hashmap internal implementation the Hashmap key modifier marked as final.

原因：在hashmap内部实现中，Hashmap键修饰符标记为final。

static class Entry<K ,V> implements Map.Entry<K ,V>
{
 final K key;
 V value;
 Entry<K ,V> next;
 final int hash;
...//More code goes here
}

For Reference : HashMap

供参考：HashMap

#1