applet - Java: How to activate a button only if a textfield has a specific value? -

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i making applet in people have enter 4-number pincode can withdraw sum of money. however, withdraw button deactivated default, , activated when single code entered in pin textfield. best way this?

you need create listener , attach textfield. listener fire e time contents of textfield changes. have listener test contents of textfield, , if correct activate button.

documentation of textfield should give need know.


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