J2ME: Contoh TextField dalam Form

/*
 * File name: FormMidlet.java 
 */


import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
/**
 * @author Daniel Siagian
 */
public class FormMidlet extends MIDlet implements CommandListener{
    Display display;
    public Command keluar=new Command("Keluar",Command.EXIT,0);
    public Form form=new Form("Contoh form");
    public TextField tf1=new TextField(null,null,32,TextField.ANY);
    public void startApp() {
        if (display==null)
                display=Display.getDisplay(this);
        
        form.append("Aplikasi mobile");
        form.append("dibuat dengan java");
        form.append("\noleh :");
        form.append("\nDaniel Siagian");
        form.append("-------------");
        form.append("Nama :");
        form.append(tf1);
 TextField tf2=new TextField(null,null,32,TextField.EMAILADDR);
        form.append("Email :");
        form.append(tf2);
        
 TextField tf3=new TextField(null,null,32,TextField.NUMERIC);
        form.append("Umur :");
        form.append(tf3);
 
 TextField tf4=new TextField(null,null,32,TextField.PHONENUMBER);
        form.append("Telpon :");
        form.append(tf4);
        
 TextField tf5=new TextField(null,null,32,TextField.URL);
        form.append("Alamat Web :");
        form.append(tf5);
 
TextField tf6=new TextField(null,null,32,TextField.DECIMAL);
        form.append("DECIMAL :");
        form.append(tf6);
        
        form.addCommand(keluar);
        form.setCommandListener(this);
        display.setCurrent(form);
    }
    public void commandAction(Command cmd, Displayable d){
        System.out.print(cmd.toString());
        if (cmd==keluar) {
            destroyApp(true);
            notifyDestroyed();
        }
    }
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
    }
}