import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.TextField;


public class IOTemp extends Form implements CommandListener
{
    TextField txtInput;
    Command cmdOutput;
    /** Creates a new instance of IOTemp */
    public IOTemp()
    {
        super("IOSample");
        txtInput = new TextField("Input :", "", 10, TextField.ANY);/* passing input value  */ 
        append(txtInput);
        cmdOutput = new Command("Add", Command.OK, 0);/* display required output value */
        setCommandListener(this);
        addCommand(cmdOutput);
    }

    public void commandAction(Command command, Displayable displayable)
    {
        try
        {
            int input = Integer.parseInt(txtInput.getString());
            append("\nOutput :" + add(input));
        }
        catch (NumberFormatException e)
        {
            
        }
    }
    
    public int add(int input)  // calculation method
    {
        return input + input;
    }
    
}