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From: bilsch <bilsch01@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: I need a different approach - suggestions please
Date: Wed, 27 Jun 2012 18:48:59 -0700
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On 6/27/2012 3:13 PM, Eric Sosman wrote:
> On 6/27/2012 5:44 PM, bilsch wrote:
>> On 6/26/2012 2:21 PM, Eric Sosman wrote:
>>> [...]
>>> You needn't use the same listener for the 7 key as for
>>> the Backspace key ...
>>>
>> The listeners all call a statement in the second file:
>>
>> public void actionPerformed(ActionEvent event)
>>
>> so I don't understand how a button listener can be different from
>> another button listener.
>>
>> Could you explain please?
>
> In your code there's a class called CrunchQ1, and because it
> implements the ActionListener interface you can (and do) tell
> your buttons to use an instance of that class as their action
> listeners:
>
> CrunchQ1 crunchNu = new CrunchQ1(this);
> ...
> dot.addActionListener(crunchNu);
> zro.addActionListener(crunchNu);
> one.addActionListener(crunchNu);
> ...
>
> What I'm suggesting is that you could perfectly have another
> class, maybe CrunchQ2, that also implements ActionListener but does
> something different in its ActionPerformed method. Then you could
> make yourself an instance of the CrunchQ2 class, and use it instead
> of the CrunchQ1 instance for some of your buttons:
>
> CrunchQ1 crunchNu = new CrunchQ1(this);
> CrunchQ2 dotty = new CrunchQ2(...whatever...);
> ...
> dot.addActionListener(dotty);
> zro.addActionListener(crunchNu);
> one.addActionListener(crunchNu);
> ...
>
> If you have other buttons with idiosyncratic behaviors, you
> could give them their own ActionListener implementations, too.
> There is no reason in the world why every button in your program
> should share the same listener!
>
Thanks for the info.