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I'm a little lost here. We were given a jar file which contained 3 different .class files in it. I successfully built the path to the jar file, but I don't know how to use them. The class files obviously contain methods that can be used, but I've never worked with a jar file before so I don't know how to use them. I'm not sure if I have to import them somehow, how to instantiate them or anything. I have searched for tutorials to no avail.

All I'm looking for is some guidance so I can get moving on this project. If it is a case where I have to import them somehow how would I do it? For example, I have WikiEdits.class contained in WikiEdits.jar. The name of my main class is P2. Can someone show me a brief example of how this works?

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3 回答 3

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如果您使用的是 IDE，请将 jar 添加到您的类路径中。

然后，使用它的 java 类看起来像这样：

package p2;
import blah.WikiEdits;  //references a class in the jar

public final class P2 {  //(this is a strange name for a class, by the way)
  public static void main(String... args){
     //builds a new object of the given class
     WikiEdits thing = new WikiEdits();
  }
}

如果您使用命令行，这些示例可能会有所帮助： http ://www.javapractices.com/topic/TopicAction.do?Id=243

于 2013-09-28T16:06:50.080 回答
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您需要将 WikiEdits.jat 添加到您的路径项目中，然后导入并实例化该类。

import WikiEdits

P2 p = new P2();
p.somemethod();

静态类：

WikiEdit.someMethod();
于 2013-09-28T16:01:59.103 回答
0

在您的 java 类中添加importsjar 中的相关内容。然后从命令行，您可以通过定义正确的类路径，使用 jar 中的类来编译和运行您的类：

汇编

在窗户上：

javac -cp .;pathtoyourjar YourClass.java

在 Linux 上：

javac -cp .:pathtoyourjar YourClass.java

执行

在窗户上：

java -cp .;pathtoyourjar YourClass

在 Linux 上：

java -cp .:pathtoyourjar YourClass

如果您使用的是 Eclipse，请按照此链接了解将 jar 添加到项目的步骤：

http://www.cs.duke.edu/courses/cps004g/fall05/assign/final/addlibrary.html

于 2013-09-28T16:03:48.780 回答