题解 | 开学？

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        // 注意 while 处理多个 case
            int a = in.nextInt();
            int b = in.nextInt();
            if(a+b>7){
                int c = (a+b)%7;
        switch (c){
            case 0:
                System.out.println("7");
                break;
            case 1:
                System.out.println("1");
                break;
            case 2:
                System.out.println("2");
                break;
                case 3:
                System.out.println("3");
                break;
                case 4:
                System.out.println("4");
                break;
                case 5:
                System.out.println("5");
                break;
                case 6:
                System.out.println("6");
                break;
                case 7:
                System.out.println("7");
                break;
        }
    }else{
        int f = a + b;
        System.out.println(f);
    }
}
}