java - 我该怎么做才能再次打印菜单选项？

Question

     while(flag)
     {       
        System.out.println("Press 1 to Add Student details");
        System.out.println("Press 2 to Display Student details");
        System.out.println("Press 3 to Sort");
        System.out.println("Press 4 to Search");
        System.out.println("Press 5 to Exit");
        System.out.println("Enter your choice: ");

        while(!sc1.hasNextInt())
        {
            System.out.println("Please enter proper Integer input!");
            sc1.next();
        }

        choice = sc1.nextInt();
      //more code..
    }

在上面的代码中，我从用户那里获取输入。如果用户输入除 int 之外的任何内容，则不会被接受。假设给出一个字符串而不是一个整数，则打印消息并且不再显示菜单。我希望菜单在消息之后显示。我该怎么做？

Answer 1

这可能对你有帮助

while (flag) {
    System.out.println("Press 1 to Add Student details");
    System.out.println("Press 2 to Display Student details");
    System.out.println("Press 3 to Sort");
    System.out.println("Press 4 to Search");
    System.out.println("Press 5 to Exit");
    System.out.println("Enter your choice: ");

    if (sc1.hasNextInt()) {
        choice = sc1.nextInt();
        //more code here
    } else {
        System.out.println("Please enter proper Integer input!\n");
        sc1.next();
    }
}

我添加了一个额外的“\n”以提高可读性。这样当打印警告时，选项就不会打印在下一行。