Get Java Class from PsiClass Follow

Hi all ,

I am creating a plugin to be used with Maven based Java projects.

I like to get all classes in the project classpath that extends a particular class in the project. For now I am able to do this as below.

PsiClass aClass = JavaPsiFacade.getInstance(project).findClass("com.purus.BaseModule", GlobalSearchScope.everythingScope(project));

Collection<PsiClass> allClasses = ClassInheritorsSearch.search(aClass).findAll();

After getting all the PsiClass, how do I get Java classes from them, so that I can execute a method on those classes?