如何在Eclipse项目中使用外部类文件 [英] How to Use External Class Files in an Eclipse Project

问题描述

我的讲师没有为我们提供教程的.java文件。我的问题是，我如何使用他的类文件在我的eclipse项目，并击败以下错误？

My lecturer didn't provide us with the .java files for a tutorial. My question is, how would i use his class files in my eclipse project, and defeat the following error?

错误：

  Exception in thread "main" java.lang.NoClassDefFoundError: lec/utils/InputReader
 at randomIt.main(randomIt.java:17)
    Caused by: java.lang.ClassNotFoundException: lec.utils.InputReader
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
            at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     ... 1 more

这是我的代码：

 import java.util.Random;
    import lec/utils.InputReader;

    public class randomIt {

 public static void main(String[] args) {
  Random generator = new Random();
  InputReader myReader = new InputReader();
  //Pick a number randomly between 1 and 10!
   int number = generator.nextInt(10)+1;
  //Ask user to guess...!
   System.out.println("Take a guess (1 to 10)");
   if (number == myReader.readInt()){
    System.out.println("You win");
   }
   else {
    System.out.println("It was " + number + ", tough Luck");
  }
 }

这里是我的文件夹结构：

随机 /
$
* / bin

* / lec / utils / InputReader

* / src / randomIt.java

And here is my Folder Structure:
Random /
*/ bin
* / lec / utils /InputReader
* / src / randomIt.java

注意：他的类文件是InputReader.class

Note: his class file is "InputReader.class"

推荐答案

我已经玩过一个Eclipse的工作这一个。提供以下内容：

I've had a play with Eclipse to work this one out. Give the following a go:

1. 创建以下目录结构（您的桌面会执行）classes / lec / utils


2. 将InputReader类文件放在utils目录中。


3. 删除您在构建路径中目前拥有的对InputReader的任何引用。


4. 使用（右键单击项目）属性 - > Java构建路径 - >库选择添加外部类文件夹，然后选择您在桌面上创建的classes文件夹， 。


5. 现在在项目文件夹中的'Referenced Libraries'中，你应该有一个叫做'classes'和一个名为'lec.utils'的包路径，它包含InputReader类。 / li>
   
6. 您可以在自己的类中使用'import lec.utils.InputReader'。

1. Create the following directory structure (your desktop will do) classes/lec/utils
2. Place the InputReader class file in the utils directory.
3. Remove any references you have to InputReader you currently have in your build path.
4. Using (right click on project) Properties->Java Build Path->Libraries select the 'Add external class folder' and select the 'classes' folder you created on your desktop and click OK.
5. Now in the 'Referenced Libraries' in the project folder you should have one called 'classes' and a package path under that called 'lec.utils' which contains the InputReader class.
6. You can use that class using 'import lec.utils.InputReader' in you own class.

希望有助于。

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