?? duckfactory.java
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package headfirst.combining.observer;public class DuckFactory extends AbstractDuckFactory { public Quackable createMallardDuck() { return new MallardDuck(); } public Quackable createRedheadDuck() { return new RedheadDuck(); } public Quackable createDuckCall() { return new DuckCall(); } public Quackable createRubberDuck() { return new RubberDuck(); }}
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