带有Hash-map的2维数组

Is there a way to put a 2d array into a Hash map setup?

有没有办法将二维数组放入哈希映射设置?

Example of the array would be two strings {"John", "red"}, {"George", "blue}

数组的示例是两个字符串{“John”,“red”},{“George”,“blue}

And I would want red to correspond to john etc.

我希望红色对应约翰等。

I know I can use a nested loop to go through every item in the 2d array but how would then set it up to add them to the hash-map

我知道我可以使用嵌套循环遍历2d数组中的每个项目但是如何设置它以将它们添加到哈希映射

hashMap.put("John", "red");

2 个解决方案

#1

Assuming every array has 2 items in the form of {Name, Color}, you can just iterate over it

假设每个数组都有{Name,Color}形式的2个项目,你可以迭代它

for(String[] combo : some2DArray){
   someHashMap.Put(combo[0], combo[1]); // Or swap them, depending on what you 
                                        // want to be the key and the value
}

If you want to avoid the possibility of removing data because you happen to have two people with the same name there are a few approaches you can take:

如果您想避免删除数据的可能性,因为您碰巧有两个同名的人,您可以采取以下几种方法:

Keep the old data

保留旧数据
Keep the new data

保留新数据
Assign the new data to a new key

将新数据分配给新密钥
Combine the data in the same key

将数据组合在同一个键中

Keep the old data

保留旧数据

Perform a check before using HashMap#put and see if the key already exists.
Only add the data if it doesn't exist yet.

在使用HashMap #put之前执行检查并查看密钥是否已存在。仅添加数据(如果尚不存在)。

Keep the new data

保留新数据

Use the current code, it will overwrite the old value.

使用当前代码,它将覆盖旧值。

Assign the new data to a new key

将新数据分配给新密钥

Create a new key based on your own rules and insert that.

根据您自己的规则创建一个新密钥并插入。

Combine the data in the same key

将数据组合在同一个键中

Define your HashMap as HashMap<String, List<String>> and add the values to the list.

将HashMap定义为HashMap >并将值添加到列表中。 ,list>

#2

-2

How about implementing a Pair class, so you can use HashMap<Pair<String,String>> ?

如何实现Pair类,这样你就可以使用HashMap >?

EDIT: Might be that I misunderstood your question, is that what yoe were asking?

编辑:可能是我误解了你的问题,是什么哟问的?

#1