How to use *.jar file in a Java project?
jar, java
Solution
You probably have a project folder for your Eclipse project. Go ahead and make a `lib` folder inside of your project folder, in the same directory as `src` and `bin`. There's nothing special about the `lib` folder specifically, it's just a convenient name. Copy the .jar file into your newly created folder. Back in Eclipse, right click your project and click `Refresh`. The `lib` folder should pop up, including your JAR! Right click the JAR file and go to Build Path --> Add To Build Path. At this point, any class in the project should be able to use Twitter4J features.
Problem
I'm a complete novice to Java, and I'm stuck in trying to use an external jar library in a Java project I'm working on. The library is Twitter4J (http://twitter4j.org/), a complex group of files which I can't understand how to include. I'm using Eclipse on Windows. I understood the meaning of CLASSPATH enviroment variable (or well, I think I did), but I can't understand how to link it to the Eclipse enviroment. This blog post seemed to be what I was looking for: http://jasperpeilee.wordpress.com/2012/01/25/how-to-set-up-twitter4j-quickly-in-your-java-project/ But: ``` Add twitter4j-core-2.2.5.jar into project for general use. ``` 1) Where should I copy the `core` file? In the `/bin/` folder? Or in a completly unrelated `/lib/` folder, as this question in SO stated? ``` Copy Twitter API property file into your project/bin directory. ``` 2) What is the Twitter API property file? 3) How can I include JavaDoc jar files too? Is it possibile to get them into Elipse? Any kind of help, even just a link, will be very appreciated!