Number Validation: Only numbers in TextField using Java GUI
Some of my students before always asked how to filter a textbox with only numbers that can be inputted. Right away, they always made a mistake on writing the code because they are just using the NumberFormatException code. But actually it isn't wrong, it is just sometimes not applicable and not functioning at times when I can still remember my college days.
But now, I wrote this code to filter numbers on textbox or any controls in Java. I want to share and teach about this code.
Now let's begin this tutorial!
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