How do you use a Java Library?

Question

I'm trying to use an open source java library to visualize nodes and edges in a graph, but I'm completely lost.

I have a bunch of jar files in a folder. Clicking on some of the jar files makes java swing windows pop open with graphs displayed. Clicking other jar files does nothing.

If I figured that out, would I just stick the jar files in there with the other ones, or would that still not work?

And if I ever figure out how to use these files, does that mean that I have to include them if I transfer my java project to another computer? How would I go about doing that?

Answer 1

Have you included those libraries in your classpath?

If you are using eclipse, you could

Project - > properties -> Java build path ->addJar.

And the Jar file should be placed in a directory inside your workspace (lib/ for example)

If you have to take your project to another computer, you could take these steps

1. Before doing anything, export your project (as a Jar file, for example).
2. Save it into your favorite drive (cd / usb drive/ diskette/ tape).
3. On "the other" computer, you can import this project into your workspace

Answer 2

I believe if you put the jars in your classpath, you can import and use classes just like you would a standard library. Figuring out the classpath can be confusing, but you can just set it when you start your jvm. Your IDE may have options for it, too.

Most java problems are classpath problems.