How to create instance of subclass with constructor from super class

Question

I\'d like to create a registry for classes which are subclasses of a super class. The classes are stored in a map which acts as registry. A class is picked from the registry dep

Answer 1

• Use clazz.getDeclaredConstructors() to get all constructors of the class;
• Iterate through them to find the best applicable constructor, e.g. pick the zero-args one if a single-Object-arg constructor is not available;
• Invoke that constructor using the appropriate parameters.

There is no way for this to be entirely safe, since you can't know in advance whether any applicable public constructors exist for a given class, e.g. the ctor might be private, or the available constructors might not accept parameters of the type you want (e.g. needs a String, but you only have an Object).