找出字符串中出现次数最多的字符和其出现的数量

2019-11-06 09:12:38

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public static void main(String [] params){ //查询一个字符串中出现在最多的字符 String str = "aaCSSdefeffffettgggeewwwwwggggrhhh"; String maxChar = ""; //出现次数最多的字符 int maxCount = 0; //出现的次数 Map<Character , Integer> charMap = new HashMap<>(); for (int i = 0; i < str.length(); i++) { //当前字符 Character currChar = str.charAt(i); if(!charMap.containsKey(currChar)){ //不重复的字符作为key charMap.put(currChar,0 ); } } //计算每个字符出现的数量 for (int i = 0; i < str.length(); i++) { //当前字符 Character currChar = str.charAt(i); for (Character key : charMap.keySet()) { if(key.equals(currChar)){ Integer val = charMap.get(key); val++; charMap.put(key, val); if(val>maxCount){ maxCount = val; maxChar =String.valueOf(currChar); } } } } //循环输出每个字符出现的数量 for (Character key : charMap.keySet()) { System.out.PRintln(key+"出现的数量为："+charMap.get(key)); } System.out.println("出现次数最多的是"+maxChar+"，总出现"+maxCount+"次"); }

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