用Java打印字符串变量 [英] Printing string variable in Java

问题描述

运行（看似简单）代码时，我得到了一些奇怪的输出。这就是我所拥有的：

I'm getting some weird output when running (seemingly simple) code. Here's what I have:

import java.util.Scanner;

public class TestApplication {
  public static void main(String[] args) {
    System.out.println("Enter a password: ");
    Scanner input = new Scanner(System.in);
    input.next();
    String s = input.toString();
    System.out.println(s);
  }
}

编译成功后得到的输出是：

And the output I get after compiling successfully is:

Enter a password: 
hello
java.util.Scanner[delimiters=\p{javaWhitespace}+][position=5][match valid=true][need input=false][source closed=false][skipped=false][group separator=\,][decimal separator=\.][positive prefix=][negative prefix=\Q-\E][positive suffix=][negative suffix=][NaN string=\Q�\E][infinity string=\Q∞\E]

这有点奇怪。发生了什么以及如何打印 s的值？

Which is sort of weird. What's happening and how do I print the value of s?

推荐答案

您将获得Scanner对象本身返回的 toString（）值，这不是您想要的，也不是您使用Scanner对象的方式。您想要的是通过 Scanner对象获得的数据。例如，

You're getting the toString() value returned by the Scanner object itself which is not what you want and not how you use a Scanner object. What you want instead is the data obtained by the Scanner object. For example,

Scanner input = new Scanner(System.in);
String data = input.nextLine();
System.out.println(data);

请阅读有关如何使用它的教程，因为它将解释所有内容。

Please read the tutorial on how to use it as it will explain all.

编辑

请看这里：扫描仪教程

另外看看扫描仪API ，它将解释Scanner方法和属性的一些细节。 。

Also have a look at the Scanner API which will explain some of the finer points of Scanner's methods and properties.

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