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Using Collections through Interfaces

It is an advantage to use collections via interfaces instead of classes

If possible, only use collection classes in instantiations, just after new

This leads to programs with fewer bindings to concrete implementations of collections

With this approach, it is easy to replace a collection class with another

An animal program - firmly bound to Collections - a problematic choice.
A program based on ICollection<Animal> - with a Collection<Animal>.
A program based on ICollection<Animal> - with a List<Animal>.
Output from animal collection programs.