Calculadora Para Dispositivos móveis

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import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

/**

* @author IMITIEL

*/

public class calc extends MIDlet implements CommandListener {

private Display display;

private Form forIndex;

private TextField tFValueA;

private TextField tFValueB;

private StringItem sIValue;

private Command cMSoma;

private Command cMSubtracao;

private Command cMMultiplicacao;

private Command cMDivisao;

private Command cMExit;

private Form formIndex;

public void startApp() {

display = Display.getDisplay(this);

getFormIndex();

}

public void pauseApp() {

}

public void destroyApp(boolean unconditional) {

}

public void getFormIndex() {

formIndex = new Form ("calculadora");

tFValueA = new TextField("valor: ", "", 15, TextField.DECIMAL);

tFValueB = new TextField("valor: ", "", 20, TextField.DECIMAL);

sIValue = new StringItem("resultado: ", "");

cMSoma = new Command("+", Command.ITEM, 1);

cMSubtracao = new Command("-", Command.ITEM, 2);

cMMultiplicacao = new Command("x", Command.ITEM, 3);

cMDivisao = new Command("/", Command.ITEM, 4);

cMExit = new Command("Sair", Command.EXIT, 1);

formIndex.append(tFValueA);

formIndex.append(tFValueB);

formIndex.append(sIValue);

formIndex.addCommand(cMSoma);

formIndex.addCommand(cMSubtracao);

formIndex.addCommand(cMMultiplicacao);

formIndex.addCommand(cMDivisao);

formIndex.addCommand(cMExit);

display.setCurrent(formIndex);

formIndex.setCommandListener(this);

}

private void getormIndex() {

}

public void commandAction(Command c, Displayable d) {