kiem tra

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

public class Ktra1 extends MIDlet implements

ItemStateListener, CommandListener

{

private Display display;

private Form fmMain;

private Command cmExit;

private Command cmketqua;

private StringItem siketqua;

private String diem="0";

private ChoiceGroup cgtracnghiem;

private int cgtracnghiemIndex;

public Ktra1()

{

display = Display.getDisplay(this);

// Tao ra cau hoi trac nghiem

cgtracnghiem = new ChoiceGroup("Cau hoi trac nghiem", Choice.EXCLUSIVE);

// cac tuy chon

cgtracnghiem.append("Cau hoi 0", null);

cgtracnghiem.append("Cau hoi 1", null);

cgtracnghiem.append("Cau hoi 2", null);

cgtracnghiem.append("Cau hoi 3", null);

siketqua = new StringItem("Ket Qua: ", null);

cmExit = new Command("Exit", Command.EXIT, 1);

cmketqua = new Command("Ket Qua", Command.SCREEN,2);

fmMain = new Form("");

fmMain.append("Danh sach nhom :\n");

fmMain.append("Chu Lan Phuong\n");

fmMain.append("Pham Bao Thach\n");

cgtracnghiemIndex = fmMain.append(cgtracnghiem);

fmMain.addCommand(cmExit);

fmMain.addCommand(cmketqua);

fmMain.setCommandListener(this);

fmMain.setItemStateListener(this);

}

public void startApp()

{

display.setCurrent(fmMain);

}

public void pauseApp()

{ }

public void destroyApp(boolean unconditional)

{ }

public void commandAction(Command c, Displayable s)

{

if (c == cmketqua)

{

siketqua.setText(diem);

fmMain.append(siketqua);

fmMain.removeCommand(cmketqua);

fmMain.delete(cgtracnghiemIndex);

display.setCurrent(fmMain);

}

else if (c == cmExit)

{

destroyApp(false);

notifyDestroyed();

}

}

public void itemStateChanged(Item item)

{

if (item == cgtracnghiem)

{

if (cgtracnghiem.getSelectedIndex()==0) diem = "0";

if (cgtracnghiem.getSelectedIndex()==1) diem = "1";

if (cgtracnghiem.getSelectedIndex()==2) diem = "2";

if (cgtracnghiem.getSelectedIndex()==3) diem = "3";

}

}

}