Really Basic Java Template

//Basic Java application template
import java.io.*;
import java.util.*;
import java.lang.*;

public class Template{
	
	Template(){	
            go();		
	}

	public void go(){
            try{	
		//do stuff
	    }catch(Exception e){
		e.printStackTrace();
	    }
	}
	
	public static void main(String [] args){	
            new Template();
	}
}

//Basic servlet
import java.io.*;
import java.util.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class ServletTemplate extends HttpServlet
{

    public void init(ServletConfig servletconfig) throws ServletException
    {
        super.init(servletconfig);
    }
    public void doGet(HttpServletRequest request, HttpServletResponse response) 
                                            throws ServletException,IOException {
           doPost(request, response);
    }
    
    public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
       response.setContentType("text/html; charset=UTF-8");
       request.setCharacterEncoding("UTF-8");
            
       PrintWriter out = response.getWriter();
       out.println("ok");
    }
}

//Basic applet
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Color;

public class AppletTemplate extends Applet{

  String text = null;

  public void init() {
	text = "AppletTemplate";
        setSize(100,30);
  }

  public void start() {

  }

  public void stop() {

  }

  public void destroy() {

  }

  public void paint(Graphics g){
	g.setColor(Color.red);
	g.drawString(text, 20, 20);
  }
}

//Basic Midlet
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class MidletTemplate extends MIDlet implements CommandListener
{
  public Command exitCommand;
  public Form f;

  public MidletTemplate() 
  {
    exitCommand = new Command("Exit", Command.EXIT, 1);
    f = new Form("MidletTemplate");
  }

  protected void startApp() 
  {
    f.addCommand(exitCommand);
    f.setCommandListener(this);
    Display.getDisplay(this).setCurrent(f);
  }  

  protected void pauseApp() {}

  protected void destroyApp(boolean bool) {}

  public void commandAction(Command cmd, Displayable disp) 
  {
    if (cmd == exitCommand) {
    destroyApp(false);
    notifyDestroyed();
    }
  }
}
---------------
Or with a menu..

//Basic Midlet with a menu
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class MidletTemplate extends MIDlet implements CommandListener
{
  public Command exitCommand,selectCommand=null;
  public List list=null;

  public MidletTemplate() 
  {
    exitCommand = new Command("Exit", Command.EXIT, 1);
    selectCommand = new Command("Select", Command.BACK, 0);
    list = new List("Midlet with Menu", List.IMPLICIT, new String[]{"Option 0","Option 1","About"}, null);
  }

  protected void startApp() 
  {
    list.addCommand(selectCommand);	
    list.addCommand(exitCommand);	
    list.setCommandListener(this);
    Display.getDisplay(this).setCurrent(list);
  }  

  protected void pauseApp() {}

  protected void destroyApp(boolean bool) {}

  public void commandAction(Command cmd, Displayable disp) 
  {
    if (cmd == exitCommand) {
       destroyApp(false);
       notifyDestroyed();
    }
    else if(cmd == selectCommand) {
       if(list.getSelectedIndex()==0){
            //Option 0
       }
       else if(list.getSelectedIndex()==1){
            //Option 1
       }
       else if(list.getSelectedIndex()==2){
            //About
       } 
    }
  }
}

//Basic Xlet
import javax.microedition.xlet.*;

public class XletTemplate implements Xlet {
    private XletContext context;

    public XletTemplate(){
    }

    public void destroyXlet( boolean unconditional )
	   throws XletStateChangeException {
	exitXlet();
    }

    public void exitXlet(){
	context.notifyDestroyed(); // destroys Xlet
    }

    public XletContext getContext(){ // for convenience
	return context;
    }

    public void initXlet( XletContext context )
	   throws XletStateChangeException {
	this.context = context;
    }

    public void pauseXlet(){

    }

    public void startXlet() throws XletStateChangeException {

    }
}

//Basic Android App
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidTemplate extends Activity
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        TextView tv = new TextView(this);
        tv.setText("Test");
        setContentView(tv);	
    }
}