Question

Can I get a child attributte in parent class? I see in PHP5 OOP that getting child attribute in parent class is possible, but in Java, I do not know.

Answer 1

If you want the subclasses, look here.

Then you can use Reflection to get the fields and methods of each subclass:

for(Class c : subclasses) {
  for(Field f : c.getFields())
    // Do stuff with the fields
  for(Method m : c.getMethods())
    // Do stuff with the methods
}

You can look at the Java API entry on Class for more information.