Tugas Mobile Programing : Mencari Luas Bangun

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import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

//Nama : Surya Kharisma Karnefo
//NoBP : 10101152630292
//Kelas: IF-7
//Mobail Programing


/**
 * @author 9niNEFOur4
 */

public class Tugas extends MIDlet implements CommandListener{
    private Display layar;
    private Form formUtama,f2;
    private Command cmdKeluar,cmdKembali,cmdProses;
    private Image img;
    private TextField txtSisi;
    public Tugas (){
    layar=Display.getDisplay(this);
        formUtama=new Form("Halaman Utama");
        cmdKeluar=new Command("Keluar",Command.EXIT,0);
        cmdProses=new Command("Proses",Command.OK,1);
         try{
        img=Image.createImage("/sisi.png");
        }catch(Exception e){
            System.out.println("Gambar Tidak Ada");
        }
        txtSisi=new TextField("panjang sisi = ","",10,TextField.NUMERIC);
 
        formUtama.append(txtSisi);
        formUtama.setTicker(new Ticker ("9niNEFOur4"));
    
        formUtama.addCommand(cmdKeluar);
        formUtama.addCommand(cmdProses);
        formUtama.append(img);
        formUtama.setCommandListener(this);
       
    }
    public void startApp() {
        layar.setCurrent(formUtama);
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
    }
    public void commandAction (Command c, Displayable s){
            if(c==cmdKeluar){
             destroyApp(true);
             notifyDestroyed();
         }else if(c==cmdProses){
             int Sisi,Luas;
             Sisi=Integer.parseInt(txtSisi.getString());
           
             Luas=Sisi*Sisi;
             f2=new Form("Hasil");
             cmdKembali=new Command("Kembali",Command.BACK,0);
             f2.addCommand(cmdKembali);
             f2.append("Sisi:"+txtSisi.getString()+"\n");
            
             f2.append("Luas:"+Luas);

             layar.setCurrent(f2);
             f2.setCommandListener(this);

            }else if(s==f2);
            if(c==cmdKembali){
                layar.setCurrent(formUtama);
            }

         }
}