字符串查找判断

字符串查找判断

输入两个字符串s1和s2，判断s1是否包含s2，给出结论，若包含，还需计算s1中s2的个数。要求使用string类型

import java.util.Scanner;
public class Study {
    public static void main(String[] args) {
        String str1, str2, str3;
        int m, n;
        int count = 0;
        Scanner in = new Scanner(System.in);
        System.out.print("请输入字符串s1：");
        str1 = in.nextLine();
        System.out.print("请输入字符串s2：");
        str2 = in.nextLine();
        // 判断字符串s1是否包含s2
        if ((str1.indexOf(str2)) != -1) {
            System.out.println("s1包含s2");
        } else {
            System.out.println("s1不包含s2");
        }
        m = str1.length();
        n = str2.length();
        // 判断s1中s2的个数
        for (int i = 0; i < m - n + 1; i++) {
            str3 = str1.substring(i, i + n);
            if (str3.equals(str2)) {
                count++;
            }
        }
        System.out.println("包含个数为：" + count);
    }
}