Java一起打印两行 [英] Java print two lines together

问题描述

我正在尝试在屏幕上打印一条消息，然后从键盘上获取一个值.我连续打印4张照片，但它们之间有扫描方法.当我运行代码时，前两次打印会同时运行，并且在第一次打印之后，我无法在第一个变量中插入值.

I'm trying to print a message on the screen and after that, take a value from the keyboard. i have 4 prints in a row but i have scan methods between them. When i run my code, the first two prints run together and i can't insert a value at the first variable, after the first print.

case 1:
            System.out.println("###Book Data###");
            System.out.print("Name of the book:\t");
            String Name = key.nextLine();

            System.out.print("ISBN of the book:\t");
            String ISBN = key.nextLine();

            System.out.print("Author of the book:\t");
            String author = key.nextLine();

            System.out.print("Copies of the book:\t");
            int copies = key.nextInt();
            book Book = new book(ISBN,Name,author,copies);
            lib.AddBook(Book);
            break;


#########Text Printed######
Please enter your selection:    1
###Book Data###
Name of the book:       ISBN of the book:

提前感谢您的帮助！

推荐答案

这是因为switch语句上方的行具有key.nextInt() ^* .

This is because the line above your switch statement has key.nextInt() ^*.

扫描程序读取整数，但是它将行尾字符'\n'留在缓冲区中.在switch语句内的key.nextLine();向您返回一些相关数据之前，您需要以某种方式消耗该'\n'字符.

The scanner reads the integer, but it leaves the end-of-line character '\n' in the buffer. You need to consume that '\n' character somehow, before the key.nextLine(); inside the switch statement returns some relevant data to you.

要解决此问题，请插入

key.nextLine();

在switch语句之前.

^* 不要问我我怎么知道:-)

^* don't ask me how I know that :-)

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