求字符串中某个字符出现的次数

经典的用String的indexOf和substring组合方法来求字符串中某个字符出现的次数

 

import java.util.Scanner; public class Practise04 { public static void main(String[] args) { // TODO Auto-generated method 
        String str = "jstubavajfiewjavajfiowfjavagkljjava"; System.out.println("请输入一个要查找的字符:"); Scanner sc = new Scanner(System.in); String str1 = sc.next(); System.out.println(str1 + "在字符串中出现了"+getCount(str,str1)+"次"); } //经典的用String的indexOf和substring组合方法来求字符串中某个字符出现的次数
public static int getCount(String str,String scan){ int count = 0; int index = 0; while(((index = str.indexOf(scan)) != -1)){ //想个办法截取字符串中查找字符,并将查找当前匹配字符之后的字符串重新 //赋值给字符串
            str = str.substring(index+1); count++; } return count; } }