Java 如何更改哈希映射中键的值？
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How can I change the value of a key in a hash map?
提问by pgray10
I have created a hash map that the users input the key and the value. I want to be able to change the value of the hash map if a specific key is entered. I tried the setValuemethod but got nothing. The value and the key are both strings. What method would I use to change this?
我创建了一个哈希映射，用户输入键和值。如果输入特定键，我希望能够更改哈希映射的值。我尝试了该setValue方法，但一无所获。值和键都是字符串。我会用什么方法来改变这个？
回答by Luiggi Mendoza
Just use Map#putusing the current oldkey and the new value:
只需使用Map#put当前的旧键和新值：
Map<String, String> map = new HashMap<>();
map.put("user", "Luiggi Mendoza");
System.out.println(map);
//replacing the old value
map.put("user", "Oli Charlesworth");
System.out.println(map);
Output:
输出：
{user=Luiggi Mendoza}
{user=Oli Charlesworth}
