如何创建自己的库(Jar包)?_搭建自己的jar包1库-优快云博客

本文介绍如何在Eclipse中创建并使用Java库。通过简单的步骤，包括创建项目、导出为jar文件及在其他项目中引用该库，实现代码复用。

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Build a Java library by using jar file

Code reuse is one of the most important factors in software development. It is a very good idea to put frequently-used functions together and build a library for yourself. Whenever some method is used, just simply make a method invocation.

For Java, it’s straightforward to manage such a library. Here a simple example in Eclipse.

The library will contain only one “add” method.

Step 1: Create a “Java Project” named as “MyMath”, and a simple “add” method under “Simple” class.

Package structure is as follows:

Simple.java

public class Simple {
    public static int add(int a, int b){
        return a+b;
    }
}

Step 2: Export as a .jar file.

Right Click the project and select “export”, a window is show as follows.

Following the wizard, to get the .jar file.

Step 3: Use the jar file.

Right click the target project, and select “Build Path”->”Add External Archives”->following wizard to add the jar file.

Now you can make a simple method call.

public class Main {
    public static void main(String[] args) {
        System.out.println(Simple.add(1, 2));
    }
}

转自：http://www.programcreek.com/2011/07/build-a-java-library-for-yourself/