Question

java怎么实现统计一个字符串中字符出现的次数？

java新手
就是比如“my name is jim,what your name?”统计这句话各个字符出现的字数

Answer 1

import java.util.*;
public class Test {
public static void main(String args[]){
String s = "abcdad"; //待测试的字符串
Map<Character, Integer> result = getCharMaps(s);
System.out.println(result);//打印出字符串中各字符出现的次数！

}
public static Map<Character, Integer> getCharMaps(String s) {
Map<Character, Integer> map = new HashMap<Character, Integer>();
for(int i = 0; i < s.length(); i++) {
Character c = s.charAt(i);
Integer count = map.get(c);
map.put(c, count == null ? 1 : count + 1);
}
return map;

}

}

Answer 2

/**
* @param selectStr 查询字符
* @param targetStr 目标字符串
* @return
*/
public static int findStrIndexOfCount(String selectStr, String targetStr) {
int selectLength = selectStr.length();
int targetLength = targetStr.length();
if (selectLength > 0 && selectLength < targetLength) {
return (targetLength - targetStr.replaceAll(selectStr, "").length()) / selectLength;
}
return -1;
}

public static void main(String[] args) {
System.out.println(findStrIndexOfCount("w", "wawawow"));
}

Answer 3

public class CharCounter{
public static int counter(String s,char c){
int count=0;
for(int i=0;i<s.length();i++){
if(s.charAt(i)==c){
count++;
}
}
return count;
}
public static void main(String args[]){
System.out.println(new CharCounter().counter("LOVELOVEYOU",'O'));
}
}
试试这个，调试好了，可以直接运行，祝工作学习顺利
另外,站长团上有产品团购,便宜有保证

Answer 4

字符？java的字符范围很广的，你的意思是不是指 字母啊？
字母的话就好做多了，数组+if+for，搞定！多想想，实在不懂再问！

Answer 5

题意不完整呀，你这么说出来能有好多做法！