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public interface Subject { void registerObserver(Observer observer); void notifyObservers(); }

public class TurkeyAdapter implements Duck { private Turkey turkey; public TurkeyAdapter(Turkey turkey) { this.turkey = turkey; } @Override public void quack() { turkey.gobble(); } } Their travels next took them to the domain. Here, they encountered the Observer, a pattern that allowed objects to notify others of changes without creating tight couplings. The Code Crusaders saw how this pattern facilitated loose coupling and improved extensibility. dive into design patterns pdf github top

public interface Observer { void update(String message); } they encountered the Observer

public class Dog extends Animal { @Override public void sound() { System.out.println("Woof!"); } } dive into design patterns pdf github top