Dynamic Method invocation in Apex

gistfile1.cls

public interface Executable {
   void execute(String method);
}

public class DoAwesomeStuff implements Executable {
   public override void execute(String method) {
       if (method == 'method1') method1();
       else if (method == 'method2') method2();
   }

   private void method1(){
     /* method 1 body */
   }

   private void method2(){
     /* method 2 body */
   }

}

public class RidiculousStuff implements Executable {
   public override void execute(String method) {
       if (method == 'foo') foo();
       else if (method == 'bar') bar();
   }

   private void foo(){
     /* do foo */
   }

   private void bar(){
     /* do bar */
   }

}

public class Main {
   public Main() {
       Map<String,String> params = ApexPages.currentPage().getParameters();
       System.Type t = System.Type.forName(params.get('class'));
       if (t == null) return;
       Executable x = (Executable) t.newInstance();
       x.execute(params.get('method'));
   }
}