Thread: Simple Calculator

Hi there, I'm building a simple GUI calc with swing + netbeans.
I'm a little puzzled on how to organise input and output given that the screen needs to default back to 0.0 instead of just a blank bar. I need it so when you enter text the 0.0 disappears, and control when it reappears/disappears.

I've tried things like
(This will be pressing the 0 button.)

 
if(txtDisplay.getText() == "0.0"){
           reset();
           txtDisplay.setText("0")
}else{
            txtDisplay.setText(txtDisplay.getText() + " 0");
}

Thanks.

First off, don't use == with String. Do a search of these forums or on google for great explanations on what you should use instead.

Secondly, you don't tell us what this code actually does. Does it work? Throw an error? Something else?