How to make Java plugins?

Question

If I want to make my Java program to be able accept plugins, how can I make Java plugins to use classes of core program without including all the code to the plugin code? How plugin can have access to programs interface without including it to it's own jar file?

Answer 1

Have a look at the Java Plugin Framework. It uses the concept of extension points or places in your application that are designed to be extended. Plugins are the means that your application is then extended.