My early attempts in my career did that and I have learnt. Programming to interfaces always has an advantage. I always get questions from junior developers about handling cases where only subtypes have the methods/functionality required. Say Animal class with Dog subtype having method bark(). They want bark() functionality. The actual challenge is that they want a behaviour of animal communication not bark() but animal speak(). So a new Cat sub class would not require meow(). What about this then: - My dog's form a pack, but cats don't. The answer pack() behaviour is not owned by a single dog. Pack is a different aspect, pass a pack to all objects and ask the objects to join the pack. My Wolf class can use the same behaviour. Am I rigid about this, no if it is only 1 off instance I am fine. If the answer is I am not sure, then you better play safe by working at interface contracts. Cast element in Java For Each statement up vote 9 down vote favorite 2 Is it possible (or even advisable). It is in fact possible to combine the cast with the for loop, like so: List<BaseType> list = DAO.getList(); for (SubType subType : ((List<SubType>) list)). The Loop is Canada’s source for social lifestyle and entertainment content. From life hacks and beauty tips to sex advice from the Golden Girls, we serve up fresh content daily with a dash of perspective and plenty of humour. It’s just what you need, just when you. The Loop is a career network for creative talent. Get your creative portfolio online and in front of the best employers. Secure your next dream creative job FREE on The Loop.
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