java怎么实现统计一个字符串中字符出现的次数

Question

如题所述

Answer 1

package com.zuidaima.util.string;
import java.io.*;
public class CountString {

public static int count(String result, String target) {
int count = 0;
int index = 0;
while (true) {
index = result.indexOf(target, index + 1);
if (index > 0) {
count++;
} else {
break;
}
}
br.close();
return count;
}

public static void main(String[] args) {
try {
System.out.println(count("asdajklsdjklasjdkalsj", "a"));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

}

Answer 2

String str1 = "nihaoksdoksad";
String str2 = "ok";
int total = 0;
for (int i = 0; i < str1.length(); i ++){
if(str1.indexOf(str2) == 0){
total ++;
}
}
System.out.println(str1+"中含有"+total+"个"+str2);