Listing abstract classes within a Java package [duplicate]

With Guava's ClassPath class you can list all top level classes in a package. You can then use the Modifier class to find out if the class is abstract.

Here's a small example

public static void main(String[] args) throws IOException { ClassPath p = ClassPath.from(ClassLoader.getSystemClassLoader()); // might need to provide different ClassLoader ImmutableSet<ClassInfo> classes = p.getTopLevelClasses("com.example"); for (ClassInfo classInfo : classes) { Class clazz = classInfo.load(); int modifiers = clazz.getModifiers(); if (Modifier.isAbstract(modifiers)) { System.out.println("Class '" + clazz.getName() + "' is abstract."); } } }