求帮！！编写个代码……

import java.sql.*;
import java.util.Scanner;

class CountSubString{
    void countSubString(String s,String substring){
        int count=0,i;
        while(s.contains(substring)){
            i=s.indexOf(substring);
            s=s.substring(i+substring.length());
            count++;
        }
        System.out.println("检索到"+count+"个子串"+substring);
    }
}

public class CountString {

    public static void main(String[] args) {
        Scanner reader= new Scanner(System.in);
        System.out.println("请输入字符串：");
        String s = reader.nextLine();
        System.out.println("请输入你要检索的子串：");
        String substring = reader.nextLine();
        CountSubString a = new CountSubString();
        a.countSubString(s,substring);
    }
}

 觉得有用的话采纳一下哈

粗糙的代码，基本能用，你可以自己润色一下吧