Question

If I have code similar to the following:

public Constructor(final Object o) {
    taskSystem.add(new CycleTask(15, 15, -1) {

        @Override
        public void execute() throws Throwable {
            //access o here every 15 cycles forever
        }
    });
}

When would o be garbage collected, if ever? Only when the task has been collected, or will it remain in memory forever because it’s final?

Answer 1

o might get garbage collected once it is not reachable any longer, whether it is final or not. Obviously, as long as execute is running, if it needs to access o, it will prevent GC.

When execute is done running, and assuming you have not stored any references to o (for example in a collection), it will be flagged as ready for garbage collection.