Load the compiled class and deploy programmatically

Question

so, i am making a compiler,
the compilation part is using java compiler api
i want to ask, is there any api to run the generated class
and is there any api to deploy it??
or is it a must to use Runtime.getRuntime().exec ?
thanks

Answer 1

In outline it's pretty easy. The URLClassLoader can load classes from either .jar files and class directories. For dynamic class generation it's not worth using the .jar format, compile into a directory.
Then you just need to create a URLClassLoader using a file: type URL poiting to the base class directory (packages are represented as nested directories inside.)
File classDir = ......
ClassLoader cl = new URLClassLoader(new URL[]{classDir.toURL()});
Class loadedClass = cl.loadClass(className);Some complications:
This will not load the dynamic class if there's a class with the same name and package on the class path.
Having loaded a class, you need to know how to use it. Typically you create an instance with newInstance() and cast it to some interface that these classes are supposed to implement (and which is on the class path).