(PDF and GitHub links can be found in the references below)

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.

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.