package develop.org;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
/**
* @author Jose Luis Pino Cofre
*/
public class Calculate extends MIDlet implements CommandListener {
private Command exitCommand = new Command (“Exit”, Command.EXIT, 1);
private Command okCommand = new Command(“Calcular”, Command.OK,2);
private TextField t = new TextField(“Porcentaje “,”",4,TextField.DECIMAL);
private StringItem si = new StringItem(“Nota: “, “”);

private boolean firstTime;
private Form mainForm;

public Calculate () {
firstTime = true;
mainForm = new Form (“Calcular Nota”);
}

protected void startApp () {
if (firstTime) {
mainForm.append (“App que permite calcular nota con 60% corte”);
mainForm.append(t);
mainForm.append(si);
mainForm.addCommand (exitCommand);
mainForm.addCommand(okCommand);
mainForm.setCommandListener (this);
firstTime = false;
}
Display.getDisplay (this).setCurrent (mainForm);
}
public void commandAction (Command c, Displayable s) {
if (c == exitCommand) {
destroyApp (false);
notifyDestroyed ();
}
else
if (c == okCommand) {
double nota;
int p = Integer.parseInt(t.getString());
if (p<60)
nota = (double)p/2+10;
else
nota = (double)p*75/100-5;
si.setText(String.valueOf(nota));
}
}
protected void destroyApp (boolean unconditional) {
}
protected void pauseApp () {
}
}

Esta nota se calcula con un porcentaje de corte del 60%.

Imagen de la aplicación funcionando,

jp