Notes

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import java.io.*;
public class calculator extends MIDlet implements CommandListener
{
private Form form;
private Display display;
private TextField input1, input2;
private Command add, sub, mul,div;
private StringItem item;

public calculator()
{

}
public void startApp()
{
display = Display.getDisplay(this);
Form form = new Form("Calculator");
form.append("Hello everybody");
item = new StringItem("Result", "");

input1 = new TextField("First Number:", "", 30, TextField.NUMERIC);
input2 = new TextField("Second Number", "", 30, TextField.NUMERIC);
form.append(input1);
form.append(input2);
add = new Command("Addition", Command.OK, 1);
sub = new Command("Subtraction", Command.OK, 1);
mul = new Command("Multiplication", Command.OK, 1);
div = new Command("Division", Command.OK, 1);
form.addCommand(add);
form.addCommand(sub);
form.addCommand(mul);
form.addCommand(div);
form.append(item);

form.setCommandListener(this);

display.setCurrent(form);
}

public void pauseApp() { }

public void destroyApp(boolean uncondn)
{
notifyDestroyed();
}
private void calculate()
{int one=Integer.parseInt(input1.getString());
int two= Integer.parseInt(input2.getString());
int result=one+two;
item.setText( result + "" );

}
private void calculate1()
{
int one = Integer.parseInt(input1.getString());
int two = Integer.parseInt(input2.getString());
int result = one - two;
item.setText(result + "");

}
private void calculate2()
{
int one = Integer.parseInt(input1.getString());
int two = Integer.parseInt(input2.getString());
int result = one * two;
item.setText(result + "");

}
private void calculate3()
{
int one = Integer.parseInt(input1.getString());
int two = Integer.parseInt(input2.getString());
int result = one / two;
item.setText(result + "");

}
public void commandAction(Command c, Displayable d)
{
String label = c.getLabel();
if (label.equals("Addition"))
{
calculate();

}

else if (label.equals("Subtraction"))
{
calculate1();

}

else if (label.equals("Multiplication"))
{
calculate2();
form.append("The Answer is:");
}

else if (label.equals("Division"))
{
calculate3();
form.append("The Answer is:");
}
}
}