Different computer applications and their uses.

You need to write some code that responds to a text change in a jtextfield. how can you do that? create a class that implements the interface actionlistener and override the method textfieldchanged create a class that extends the superclass actionlistener and override the method actionperformed create a class that implements the interface actionlistener and override the method actionperformed create a class that extends the superclass actionlistener and override the method textfieldchanged

Larry sent an email to andy. andy didn't open larry's email but still understood what the message was. how did andy determine the message without opening the email?

Im doing this last minute and literally none of my neighbors or people that my dad works with use excel so if anyone could me make up an example