Re: thread with MouseListener

Thomas Hawtin <>
Fri, 22 Dec 2006 14:46:21 +0000
devphylosoff wrote:

I have big class extends Frame (electronic clock) and implemented 3
interfaces:WindowListener, ActionListener, MouseListener.

I suggest start by refactoring your code into something much simpler.
Bad text books like to extend Frame and implement loads of classes
because it reduces line count slightly. However, it does produce bad
code. There is rarely any need to extend Frame. Use inner classes for

BTW: AWT components are very old fashioned. There is little reason not
to use Swing.

just now I want to add Alarm, which can be closed by any from 2 buttons
clicked by mouse
i think that the best idea is run new thread with countdown to start
alarm (because of avoid alarm check in some states of my clock)

You really want to avoid threads if you can. If you use
javax.swing.Timer, the actions are fired in the same thread as input
events are fired in (the Event Dispatch Thread, EDT).

ok, so i will have new thread with countdown
when it reaches 0 alarm function starting and beeper beep through 1
minute or until user press any key (it means : click any button). I
expect MouseListener with my parent class will be sleep in this case.

Don't do anything *too* complicated within listener methods. If it
starts to get complicated, or you feel the need to call the listener
methods yourself, have them call another method having extracted any
relevant information from the event object. The interface of the new
method should make sense in the situation it is defined.

btw: how use static variable in functions
I receive error while compiling code with that declaration in function
- only in class scope I can do that.

You can't (well there is a hack to do with local classes). In general,
you should avoid any mutable static. Just place your constants in the
outer class.

Tom Hawtin

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