如何从jar或目录加载类

Question

I have found code to load classes from a directory, and code to load from a jar. My project needs to do both - use a directory when it is stand alone, and use a jar when it is jarred up for other projects.

Right now I test if the jar exists and use one function, otherwise I use the other. And while the code is vaguely similar, I can't see how to unify them.

It seems to me there must be some way that works in both cases....

Answer 1

You should NOT do this by hand. Use appropriate classpath depending on where it is running.

Running on stand-alond

java -classpath <path-to-folder> <main-class>

Elsewhere

java -classpath <path-to-jar> <other-main-class>

But why can't you use the jar when running stand-alone?