Detecting JTextField “deselect” event

谁说我不能喝 提交于 2019-11-27 02:07:15
David Kroukamp

At first though use a FocusAdapter and override focusLost(FocusEvent fe) which will be called when JTextField loses focuses, i.e another component is selected.

However because you have a purpose:

I want to check my users forms for any illegal characters before they try to submit their data

Id suggest a read on How to Use the Focus Subsystem - Validating Input

Better options than a FocusAdapter - tailored made for validating/restricting user input:

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