JAVA程序设计基础第四章习题

class Test{

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num = scanner.nextInt();
        if(num%3 == 0 && num%7 == 0){
            System.out.println(true);
        }else{
            System.out.println(false);
        }
    }
}

采纳下吧

 public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("请输入一个整数：");
        if (scan.hasNext()) {
            int str1 = scan.nextInt();
            System.out.println("输入的数据为：" + str1);
            if(str1%3==0&&str1%7==0){
                System.out.println("该数可以同时被3和7整除");
            }else {
                System.out.println("该数不可以同时被3和7整除");
            }
        }
        scan.close();
    }