Mastering Java Design Patterns - Day 2: Factory Method Pattern

Welcome back to our journey through Java Design Patterns! Yesterday, we explored the Singleton Pattern. Today, we’ll dive into the Factory Method Pattern.

What is the Factory Method Pattern?

The Factory Method Pattern defines an interface for creating an object but allows subclasses to alter the type of objects that will be created. This pattern promotes loose coupling by eliminating the need to instantiate objects directly.

Why Use the Factory Method Pattern?

• Flexibility: It provides a way to encapsulate object creation, making the system more flexible and reusable.
• Decoupling: By using a factory method, the client code becomes independent of the concrete classes it needs to instantiate.
• Scalability: It allows the introduction of new types of objects without modifying existing code, enhancing scalability.

How to Implement the Factory Method Pattern in Java

Here's a basic implementation of the Factory Method Pattern:

// Product interface
interface Product {
    void use();
}        

// Concrete Product
class ConcreteProductA implements Product {

    public void use() {
        System.out.println("Using ConcreteProductA");
    }
}        

// Concrete Product
class ConcreteProductB implements Product {

    public void use() {
        System.out.println("Using ConcreteProductB");
    }
}        

// Creator
abstract class Creator {

    public abstract Product factoryMethod();

    public void doSomething() {
        Product product = factoryMethod();
        product.use();
    }
}        

// Concrete Creators
class ConcreteCreatorA extends Creator {

    public Product factoryMethod() {
        return new ConcreteProductA();
    }
}        

// Concrete Creators
class ConcreteCreatorB extends Creator {

    public Product factoryMethod() {
        return new ConcreteProductB();
    }

}        

// Client code
public class FactoryMethodPatternDemo {

    public static void main(String[] args) {

        Creator creatorA = new ConcreteCreatorA();

        creatorA.doSomething();

        Creator creatorB = new ConcreteCreatorB();

        creatorB.doSomething();
    }
}        

Discussion:

Do you prefer using the Factory Method Pattern over direct instantiation? Have you found it useful in managing dependencies and creating flexible architectures? Share your experiences and thoughts in the comments below!

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Looking forward to your insights!

Stay tuned for tomorrow's topic: Abstract Factory Pattern.

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