calculations on text box inputs

[Dark Knight]

Hi guys,

I have made a simple form, it consists of 3 text box's textbox1, textbox2 and textbox3 as well as 1 button button1. What I want to be able to do is put numbers into textbox 1 and 2 and then show the multiplication of these numbers in textbox 3 when the button is pressed and I was wondering what is the standard way of reading these numbers from the text box and allowing us to do the conversion obviously in the textbox its a string and we need to convert to an int or double or whatever to be able to perform calculations on them then convert it back into a string to display in text box 3?

Any help would be greatly appreciated. Thanks.

[jim829]

You don't read the numbers. They are just typed in the text box (I assume JTextField). They can be retrieved with the getText() method.

Regards,
Jim

[Dark Knight]

Thanks for the input but I cant do textBox3.setText(textBox1.getText() * textBox2.getText());

[pj6444]

The thing that you need to do is convert those both into numbers(ints, doubles, floats, longs). When you use the getText() method it returns a String which you can not use operators on. You need to convert the two Strings to numbers, multiply them and then set the text to that number in String form.

So what you could do is:

textbox3.setText("" + (Integer.parseInt(textBox1.getText()) * Integer.parseInt(textBox2.getText())));