ActionListeners & Classes

[T Walsh]

Hello all, I have a question about ActionListeners, my application class entends from JFrame and implements ActionListener so it has a actionPerformed method within that class.

So can i get access to that actionPerformed method in a different class? and if so how?

Kind Regards

Tim

[Joel Christophel]

From another class, you would call a component's addActionListener() method and pass in an instance of your JFrame/ActionListener class. For example:

JButton button = new JButton();
button.addActionListener(new YourClassName());

So whenever 'button' is clicked, the actionPerformed() method from your JFrame/ActionListener class will execute.

[I Wayan Saryada]

Isn't it more light weight to implements the ActionListener in other separate class instead of in JFrame? Where later on it can be use by the JFrame and other classes that reuse this ActionListener.

[Joel Christophel]

I Wayan Saryada wrote:Isn't it more light weight to implements the ActionListener in other separate class instead of in JFrame? Where later on it can be use by the JFrame and other classes that reuse this ActionListener.

That's generally the way to go. Who knows, though, maybe the OP is doing what he's doing for a specific reason.

[Campbell Ritchie]

I shall move this discussion to our GUIs forum.

There is no difference in weight between having Listeners in different sorts of classes. No design is heavyweight or lightweight. There are object‑oriented and non‑object‑oriented versions however. I have a little rule of thumb about Listeners, and where you put their classes.