java实现查找子字符串出现次数

package com.atguigu.java1;

import java.util.Scanner;


public class huoqucishu {
    public static void main(String[] args) {
        String s1 = "abc abc abc abc abc";
        huoqucishu h = new huoqucishu();
        System.out.println(h.getNode(s1));
    }
    public String getNode(String s){
        String s1;
        System.out.println("请输入要查找的子字符串");
        Scanner scan = new Scanner(System.in);
        String in = scan.nextLine();
        int index = s.indexOf(in);
        if(index == -1){
            return String.valueOf(-1);
        }
        s1 = s.substring(index + in.length() - 1);
        int total = 0;
        while (index != -1) {
            s1 = s1.substring(index + in.length());
            index = s1.indexOf(in);
            total++;
        }

        return String.valueOf(total);
    }
}