键盘输入一个整数1~7代表今天周几，再输入间隔天数n，判断n天后是周几

代码如下（示例）：

public static void main(String[] args) {
        java.util.Scanner scanner = new Scanner(System.in);
        boolean determine = true;
        int today=0,interval=0;
        while (determine){
            System.out.print("请输入今天周几： ");
            today=scanner.nextInt();
            if (today>0&&today<8){
                determine=false;
            }else{
                System.out.println("输入有误。");
            }
        }
        System.out.print("请输入间隔天数： ");
        interval=scanner.nextInt();
        if ((today+interval%7)<=7){
            System.out.println("间隔"+interval+"天后是周"+(today+interval%7));
        }else {
            System.out.println("间隔"+interval+"天后是周"+(today+interval%7-7));
        }
    }