Question

我正在尝试为学校作业创建一个小/简单菜单驱动的银行应用程序。我正在运行一个do-while循环来询问用户想要使用哪个命令。在我获得用户输入并且循环运行一次后，第二次显示命令列表时，它会打印两次。

do {
        System.out.println("Here is a list of possible commands:");
        System.out.println("Create Customer:'c'");
        System.out.println("Exit Application:'x'");

        read = keyboard.nextLine();

        if (read.equalsIgnoreCase("c")) {
            System.out.println("You have chosen to create a new customer!");

            System.out.println("\nPlease enter the customers first name: ");
            firstName = keyboard.nextLine();

            System.out.println("\nPlease enter the customers last name:");
            lastName = keyboard.nextLine();

            System.out.println("\nPlease enter the customers address: ");
            address = keyboard.nextLine();

            System.out.println("\nPlease enter the customers email: ");
            email = keyboard.nextLine();

            System.out.println("\nPlease enter the customers phone number: ");
            phoneNum = keyboard.nextLine();

            System.out.println("\nPlease enter the customers age: ");
            age = keyboard.nextInt();

            System.out.println("\nPlease enter the customers initial deposit: ");
            deposit = keyboard.nextDouble();

            Customer tempCust = new Customer(firstName, lastName, address, email, age, phoneNum);
            tempCust.createAccount(deposit);
            customers.add(tempCust);

            System.out.println("\nThank you! A new customer has been created!\n");
        }
    } while (!read.equalsIgnoreCase("x"));

第一次循环运行时会显示：

以下是可能的命令列表：创建客户：＆＃39; c＆＃39; 退出申请：＆＃39; x＆＃39;

但第二次运行它会显示：

以下是可能的命令列表：创建客户：＆＃39; c＆＃39; 退出申请：＆＃39; x＆＃39; 以下是可能的命令列表：创建客户：＆＃39; c＆＃39; 退出申请：＆＃39; x＆＃39;

非常感谢您的帮助！

Answer 1

添加read = keyboard.nextLine（）;在你之后： System.out.println（“\ n谢谢！创建了一个新客户！\ n”）;

read = keyboard.nextLine();
System.out.println("\nThank you! A new customer has been created!\n");

你指的是不等于'x'或'c'的东西，你必须将指针移动到空行，否则你的程序将不会等待你的输入。

Java - 在do while循环首次运行后重复输出

1 个答案: