如何使用 Java 中的 Scanner 类从控制台读取输入? [英] How can I read input from the console using the Scanner class in Java?

问题描述

如何使用 Scanner 类从控制台读取输入?像这样:

How could I read input from the console using the Scanner class? Something like this:

System.out.println("Enter your username: ");
Scanner = input(); // Or something like this, I don't know the code

基本上，我想要的只是让扫描器读取用户名的输入，并将输入分配给 String 变量.

Basically, all I want is have the scanner read an input for the username, and assign the input to a String variable.

推荐答案

一个简单的例子来说明 java.util.Scanner 的工作原理是从 System.in<读取单个整数/代码>.真的很简单.

A simple example to illustrate how java.util.Scanner works would be reading a single integer from System.in. It's really quite simple.

Scanner sc = new Scanner(System.in);
int i = sc.nextInt();

要检索用户名，我可能会使用 sc.nextLine().

To retrieve a username I would probably use sc.nextLine().

System.out.println("Enter your username: ");
Scanner scanner = new Scanner(System.in);
String username = scanner.nextLine();
System.out.println("Your username is " + username);

您也可以使用 next(String pattern) 如果你想对输入有更多的控制，或者只是验证 username 变量.

You could also use next(String pattern) if you want more control over the input, or just validate the username variable.

您可以在 java.util.Scanner

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