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public interface Duck { void quack(); }

And so, armed with their newfound knowledge, the Code Crusaders returned home, ready to tackle the challenges of software development with the power of design patterns at their side. dive into design patterns pdf github top

public class Dog extends Animal { @Override public void sound() { System.out.println("Woof!"); } } public interface Duck { void quack(); } And

public class Singleton { private static Singleton instance; private Singleton() {} public static Singleton getInstance() { if (instance == null) { instance = new Singleton(); } return instance; } } Next, they encountered the Factory, a versatile pattern that allowed them to create objects without specifying the exact class. The Code Crusaders saw how this pattern enabled them to write more flexible and maintainable code. public interface Observer { void update(String message); }

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

public interface Turkey { void gobble(); }