給定哈希圖中的鍵，如何更新值？ - How to update a value, given a key in a hashmap?

問題：

Suppose we have a HashMap<String, Integer> in Java. 假設咱們在Java中有一個HashMap<String, Integer> 。

How do I update (increment) the integer-value of the string-key for each existence of the string I find? 如何爲找到的每一個字符串更新（遞增）字符串鍵的整數值？

One could remove and reenter the pair, but overhead would be a concern. 能夠刪除並從新進入該對，可是開銷將是一個問題。
Another way would be to just put the new pair and the old one would be replaced. 另外一種方法是隻放置新的一對，而舊的將被替換。

In the latter case, what happens if there is a hashcode collision with a new key I am trying to insert? 在後一種狀況下，若是哈希碼與我要插入的新密鑰發生衝突怎麼辦？ The correct behavior for a hashtable would be to assign a different place for it, or make a list out of it in the current bucket. 哈希表的正確行爲是爲其分配一個不一樣的位置，或在當前存儲桶中列出該列表。

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解決方案：

參考一： https://stackoom.com/question/HRg4/給定哈希圖中的鍵-如何更新值
參考二： https://oldbug.net/q/HRg4/How-to-update-a-value-given-a-key-in-a-hashmap