Anything wrong with the code to call method of an external class ??

Question

I have written this code to invoke metod1 in MethodList.java. :
import java.io.File;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import com.sun.org.apache.bcel.internal.util.ClassLoader;
public class RunMthdRef
public static void main(String[] args)
URLClassLoader loader = null;
     File file = new File("C:\\Documents and Settings\\227951\\workspace\\Methodcaller\\");
     String classpath = System.getProperty("java.class.path") + System.getProperty("path.separator") + file.getPath();
     System.setProperty("java.class.path",classpath);
     try
loader = new URLClassLoader(new URL[]{file.toURL()});
     catch (MalformedURLException e)
// TODO Auto-generated catch block
e.printStackTrace();
     Thread.currentThread().setContextClassLoader(loader);
     try
          Class B=loader.loadClass("MethodCaller.MethodList");
          Object objectInstance = B.newInstance();
          Method startup =B.getMethod("Method1", null);
startup.invoke(objectInstance,null);
     catch (Exception e)
          e.printStackTrace();
I want to invoke the Method1 in this class present in the same project :
public class MethodList {
     // declaring method 1
     public void Method1()
          Method2();
          Method4();
     // declaring method 2
     public void Method2()
          Method3();
//     declaring method 2
     public void Method3()
          System.out.println("End of method list");
     // declaring method 4
     public void Method4()
          Method3();
     * @param args
}

Answer 1

I have written this code to invoke metod1 in MethodList.java. :Why?
import com.sun.org.apache.bcel.internal.util.ClassLoader;Why?
     System.setProperty("java.class.path",classpath);That won't work. It's read-only, and too late to set it anyway.
          Class B=loader.loadClass("MethodCaller.MethodList");If 'MethodCaller' is the name of a package you need to study the standard Java coding conventions. Google will find them.
          Object objectInstance = B.newInstance();
          Method startup =B.getMethod("Method1", null);
startup.invoke(objectInstance,null);Do you really have to do all this reflectively?
I want to invoke the Method1 in this class present in the same project :If it's in the same project why do you need reflection? and dynamic class-loading?