用Java写1、 给定一个字符串,判断该字符串中是否包含某个子串.如果包含,求出子串的所有出现位置，:"he is a good student and he is a good boy too"中,"good"子串的出现位置为: 9,34，字符串和子串均由用户输入

好的，以下是用Java实现上述需求的代码：

import java.util.ArrayList;
import java.util.Scanner;

public class SubstringSearch {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入字符串：");
        String str = scanner.nextLine();
        System.out.println("请输入子串：");
        String subStr = scanner.nextLine();
        ArrayList<Integer> result = new ArrayList<>();
        int index = str.indexOf(subStr);
        while (index != -1) {
            result.add(index);
            index = str.indexOf(subStr, index + 1);
        }
        if (result.size() == 0) {
            System.out.println("该字符串中不包含该子串。");
        } else {
            System.out.println("该字符串中共出现了" + result.size() + "个\"" + subStr + "\"子串，位置分别为：" + result.toString());
        }
    }
}

Hope it helps!