Question

java怎么判断一个字符串中字母出现的次数

Answer 1

1、根据length获取字符串长度

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String s = "abcdedfae";//定义一个字符串
int len = s.length();//获取原来的字符串长度

2、通过replaceAll方式，把字符串中该字母替换成空

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String <a href="https://www.baidu.com/s?wd=s1&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Y3PWNBrHnYnW6sPH7WPj9-0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPH6YPWDsrjD3" target="_blank" class="baidu-highlight">s1</a> = s.replaceAll(要统计的字母,"");

3、获取替换后的字符串长度

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int len2 = <a href="https://www.baidu.com/s?wd=s1&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Y3PWNBrHnYnW6sPH7WPj9-0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPH6YPWDsrjD3" target="_blank" class="baidu-highlight">s1</a>.length();

4、原来的字符串长度减去替换后的字符串长度就是该字母出现的次数

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int lenTimes = len1-len2;//出现的次数