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?这样的事情:
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,我想要的只是扫描程序读取用户名的输入,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
如何工作将从 System.in $读取一个整数C $ C>。这真的很简单。
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);
你也可以使用 next(字符串模式)
如果你想要更多地控制输入,或者只是验证用户名
变量。
你会发现有关<* c的 API文档中的实现的更多信息$ c> java.util.Scanner
You'll find more information on their implementation in the API Documentation for java.util.Scanner
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