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Groups > comp.lang.java.programmer > #34877

Re: Event overhead, does it matter?

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On 7/13/2016 9:51 AM, Eric Douglas wrote:
> Is one method more efficient (speed, memory) or is it just a matter of personal preference?

> Method 1:
> public class MyTree extends JTree implements FocusListener {

 > scrollPane.addFocusListener(this);
> addFocusListener(this);

> public void focusGained(final FocusEvent e) {
> if (e.getComponent() == this) {
> // tree gained focus
> }
> if (e.getComponent() == scrollPane) {
> // scroll pane gained focus
> }
> }

> Method 2:
> public class MyTree extends JTree {

> scrollPane.addFocusListener(new FocusListener() {
> public void focusGained(final FocusEvent e) {
> // scroll pane gained focus
> }

> });
> addFocusListener(new FocusListener() {
> public void focusGained(final FocusEvent e) {
> // tree gained focus
> }

> });

You should totally ignore speed and memory considerations.

The difference will be white noise.

Criteria should be readability and a natural design.

I would be inclined to go for method 2, because
it is really two focus listeners, using the same and
having an if within the methods is a design kludge.

Arne

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Event overhead, does it matter? Eric Douglas <e.d.programmer@gmail.com> - 2016-07-13 06:51 -0700
  Re: Event overhead, does it matter? Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-13 10:36 -0400
  Re: Event overhead, does it matter? Arne Vajhøj <arne@vajhoej.dk> - 2016-07-13 10:45 -0400

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