How can I get the type of a class to use as a method parameter?

Question

I have the following class:

public abstract class A<T extends Event> {
  void onEvent(T event);
}

and a Class<? extends Event> clazz Class<? extends Event> clazz object. How can I create an anonymous subclass of A with the same generic type parameter as my class object? In other words, how can I get the type from my class object and pass it into a new subclass of A ?
Something like this:

new A<clazz.getType()>() {
  @Override
  public void onEvent(clazz.getType() event) {}
}

Answer 1

Java is a compiling language so you cannot dynamically change the class type so we have to define if blocks to change the type as per the data.

Your main Event class:

public class Event {}

The A class which get the type of class

public abstract class A<T extends Event> {
    void onEvent(T t){};
}

Sample inherited class

public class Sample extends Event {}

Simple implementation

Sample sample = new Sample();

if (sample instanceof Sample) {

    A<Sample> a = new A<Sample>() {

        @Override
        public void onEvent(Sample t) {
            System.out.println(t.toString());
        }
    };

    // Simple implementation
    a.onEvent(sample);
}