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Message: [QUOTE="-, post: 614761"] In my case, since Gap is my class, I can pass to its constructor, or in your case the NewGap's constructor, a reference of the class that has the doLayout() method. I'm trying to avoid doing that because it looks out of place if you do a new Gap(someClass, x, y) rather than a new Gap(x, y); I'm wondering whether in the real world, the way I am going about doing it is accepted - that is to leave it up to the user to call setGap(Gap gap) again after he has set any new values of gap. [/QUOTE]