Java Intermediate Programming Tutorial #5 - Forms 2: ActionListeners

Today we will be going over ActionListeners, the backbone behind making forms actually functional.

[ケン-wk]

Thanks alot again!This would help alot on my subsequent lessons :)

[parandersson]

Hi I got a error message and do not understand what is wrong?
"[line: 20]
Error: cannot find symbol
symbol: variable JOptionPane
location: class plusOneAction5"

I wrote this line:
{
JOptionPane.showMessageDialog(null, "The base value you have entered is either too large, too small, or not a number.");
tempValueStorage = -1;
}