Fire an Activity with a ListActivity

package com.example.threads;

import android.app.ListActivity;
import android.content.Intent;
import android.database.DataSetObserver;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;

public class Menu extends ListActivity{
	
	String[] classes = {"HelloActivity","exmaples","exmaples","exmaples","exmaples"};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setListAdapter(new ArrayAdapter<String>(Menu.this,android.R.layout.simple_list_item_1,classes));
	}
	

	@Override
	protected void onListItemClick(ListView l, View v, int position, long id) {
		// TODO Auto-generated method stub
		super.onListItemClick(l, v, position, id);
		
		Class ourClass;
		try 
		{
			String positionSelected = classes[position];
			ourClass = Class.forName("com.example.threads." + positionSelected);
			Intent i = new Intent(Menu.this,ourClass);
			startActivity(i);
		} 
		catch (ClassNotFoundException e) 
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}

	
	

}