Is there some way to detect if a JTextField is deselected, i.e. the field WAS selected but now you have selected something else. The reason why I want to do this is because I want to check my users forms for any illegal characters before they try to submit their data. If there is some easier way to do that, instead of the way I'm trying to solve it, I'll gladly accept enlightenment.
Detecting JTextField "deselect" event
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At first though use a
FocusAdapterand overridefocusLost(FocusEvent fe)which will be called whenJTextFieldloses focuses, i.e another component is selected.However because you have a purpose:
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:DocumentFilter. See here and this variation for an example.InputVerifier. See here for an exampleJFormattedTextField. See here for an example