Good examples of closures / first order functions in java is through a visitor; example below is like the ones in A Little Java, A Few Patterns new Top(new Anc

Good examples of closures / first order functions in java is through a visitor; example below is like the ones in A Little Java, A Few Patterns new Top(new Anchovy(), new Top(new Tuna(), new Top(new Lettuce(), new Bot()))) .accept( new RemVisitor(new Anhovy() ); This removes those smelly Anchovies from your tuna sandwich -- and can be implemented with a closure or not. If accept() method returns a new Top w/o Anchovies and RemoveVisitor stores what to remove in its field then it is a closure. This book is cool for lisp programmers to learn programming with recursive objects like composites and decorators.