问题描述
假设我们在Java中有一个HashMap<String, Integer>.
Suppose we have a HashMap<String, Integer> in Java.
对于找到的每个字符串，如何更新(递增)字符串键的整数值?
How do I update (increment) the integer-value of the string-key for each existence of the string I find?
一个人可以删除并重新输入该对，但是开销会成为问题.
另一种方法是只放置新的一对，而旧的将被替换.
One could remove and reenter the pair, but overhead would be a concern.
Another way would be to just put the new pair and the old one would be replaced.
在后一种情况下，如果哈希码与我尝试插入的新密钥发生冲突，该怎么办?哈希表的正确行为是为其分配一个不同的位置，或在当前存储桶中列出该列表.
In the latter case, what happens if there is a hashcode collision with a new key I am trying to insert? 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.
推荐答案
map.put(key, map.get(key) + 1);
应该没问题.它将更新现有映射的值.请注意，这使用自动装箱.
should be fine. It will update the value for the existing mapping. Note that this uses auto-boxing.
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