What is the effect of consuming at end? _____ node.setOnMouseClicked(e - {
System.out.println("Node clicked"); e.consume(); });

Question

What is the effect of consuming at end? _____ node.setOnMouseClicked(e -> {
System.out.println("Node clicked"); e.consume(); });

BlackTom AI · Accepted Answer

The code snippet uses e.consume() inside a mouse click handler. This method marks the event as consumed, which affects how the event is propagated through the scene graph.
Option a: 'Prevents further bubbling handlers from running' is correct. In JavaFX, consuming an event stops it from being delivered to any further event handlers in the bubbling chain (i.e., ancestor nodes' handlers in the bubbling phase), so no additional bubbling handlers will run.
Option b: 'Prevents current handler' is incorrect. The current handler executes before consume() is called, and consume() only affects later delivery, not the handler that invoked it.
Option c: 'Prevents rendering' is incorrect. Consuming an event does not disable rendering or affect the visual update of the scene.
Option d: 'Prevents capturing' is incorrect. Capturing refers to the event-fire order from root down to the target (the capturing phase) in some event models, but in JavaFX the relevant effect of consume() is on subsequent handlers in the bubbling phase, not on a rendering or capture stage.
Option e: 'Removes node' is incorrect. consume() does not remove the node from the scene graph; it only influences event delivery.

Advanced Programming (202509-LLecture)

What is the effect of consuming at end? _____ node.setOnMouseClicked(e -> { System.out.println("Node clicked"); e.consume(); });

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