Swing - replacement for Qt signal/slots

Question

In Qt GUIs it is very convenient use signals & slots - it decouple events passing. When I create some widget that throw signal, I don't have to know in advance who can get it, and later with connect I specify connections.

What is parallel in Java/Swing? Can you point to good resources on this issue?

It's been a long time since I used Java, but don't you just add listeners to the events? — San Jacinto, Jun 01 '11 at 14:37
@San Jacinto: Qt also has events, but also signals & slots which is more convenient frequently — zaharpopov, Jun 01 '11 at 14:38
Qt events are not analogous to Swing events. Swing event listeners are closer to Qt's event filters. — San Jacinto, Jun 09 '11 at 15:19

score 5 · Accepted Answer · edited May 23 '17 at 12:14

If none of the existing EventListener implementations meet your requirements, you can create your own custom event. Every JComponent contains a field of type EventListenerList. You can use the approach outlined in the EventListenerList API to enable your custom JComponent subclass to fire your custom event.

Regarding the signal/slot mechanism, Swing has several ways to implement the observer pattern, outlined here.

score 1 · Answer 2 · edited Jun 20 '20 at 09:12

1

This Event Listener tutorial goes through the basics of handling events with listeners.

Connecting your slot for a signal is analogous to adding your EventListener to an event-producing object.

edited Jun 20 '20 at 09:12

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answered Jun 01 '11 at 14:41

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Swing - replacement for Qt signal/slots

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