Reflection API

It started 2 years ago, when I have to develop a web based system using PHP.
I'm not a PHP expert, so I asked my friends who works as PHP Developer a question
"What are they usually need for developing system? What is the best framework did they
use?" So 2 frameworks comes, Eocene and Mojavi.

I'm trying to learn about Mojavi, and I have to learn so many things to start my
project. Oh my god. So I stopped and think "Why don't I learn the concepts, and create
the framework by myself, so I don't have to waste time to learn features and
regret if the framework didn't fit to me".
So I started my simple framework using OO on PHP.
The problem is "how can I handle with unexists class on code time, but exist on
run time?" Google comes to help and I found "reflection".
So there is reflection API on PHP as well.
After that I learn reflection on Java.

Here is an example of how to use reflection API.

package uudashr.reflection;

public class Example {
  public void hello() {
      System.out.println("This is hello method");
  }

  public String toString() {
      return "This is example instance [from toString method]";
  }
}

How to handle this simple class using reflection API? watch this.

package uudashr.reflection;

import java.lang.reflect.Method;

public class GettingClass {
  public static void main(String[] args) {
      testCreateInstance();
    
      testExecutingMethod();
  }

  public static void testCreateInstance() {
      try {
          Class exampleClass = Class.forName("uudashr.reflection.Example");
          Object obj = exampleClass.newInstance();
          System.out.println(obj.toString());
      } catch (Exception e) {
          e.printStackTrace();
      }
  }

  public static void testExecutingMethod() {
      try {
          Class exampleClass = Class.forName("uudashr.reflection.Example");
        
          Object obj = exampleClass.newInstance();
        
          Method helloMethod = exampleClass.getMethod("hello", null);
          helloMethod.invoke(obj, null);
      } catch (Exception e) {
          e.printStackTrace();
      }
  }
}