本文介绍了查找Java String中出现的字符的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想计算字符串中字符的出现次数，假设我有字符串aaaab，我如何计算其中的数量？
I would like to count the occurrences of a character in a string, suppose I have the string "aaaab", how would i count the amount of a's in it?
推荐答案
如果不使用正则表达式，代码看起来更容易阅读。
The code looks way easier to read if you don't use regular expressions.
int count = 0;
for(int i =0; i < string.length(); i++)
if(string.charAt(i) == 'a')
count++;
count 现在包含'a'的数量在你的字符串中。并且，这在最佳时间内执行。
count now contains the number of 'a's in your string. And, this performs in optimal time.
正则表达式适用于模式匹配。但只需一个常规循环即可完成工作。
Regular expressions are nice for pattern matching. But just a regular loop will get the job done here.
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