What is the difference between factory and simple factory in Java?

Randy 161 Published: 10/20/2024

What is the difference between factory and simple factory in Java?

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Java factory developer tutorial

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Java Factory Developer Tutorial

The factory design pattern is a creational design pattern that provides an interface for creating an object, but it lets subclasses decide which class to instantiate. It's often used when you need to create objects of different classes based on certain conditions or runtime information.

Here's a step-by-step guide to developing a Java factory developer tutorial:

Define the Interface: Start by defining an interface that represents the type of object you want to create. Let's call it Product. This interface should have methods that are common among all products, such as getName() and getDescription().

public interface Product {
String getName();
String getDescription();
}

Create Concrete Products: Next, create concrete product classes that implement the Product interface. For example, let's say you want to create a factory for creating cars, trucks, and buses.

public class Car implements Product {
@Override
public String getName() {
return "Car";
}
@Override
public String getDescription() {
return "A four-wheeled vehicle.";
}
}
public class Truck implements Product {
@Override
public String getName() {
return "Truck";
}
@Override
public String getDescription() {
return "A large vehicle for transporting goods.";
}
}
public class Bus implements Product {
@Override
public String getName() {
return "Bus";
}
@Override
public String getDescription() {
return "A large vehicle for transporting people.";
}
}

Define the Factory: Now, create a factory interface that provides the method for creating objects of different classes.

public interface VehicleFactory {
Product createVehicle();
}

Implement the Factory: Implement the VehicleFactory interface to provide the method for creating objects of different classes. For example, you can create a car factory and truck factory.

public class CarFactory implements VehicleFactory {
@Override
public Product createVehicle() {
return new Car();
}
}
public class TruckFactory implements VehicleFactory {
@Override
public Product createVehicle() {
return new Truck();
}
}

Use the Factory: Finally, use the factory to create objects of different classes.

Here's a simple example:

public class Main {
public static void main(String[] args) {
VehicleFactory carFactory = new CarFactory();
Product car = carFactory.createVehicle();
System.out.println("Name: " + car.getName());
System.out.println("Description: " + car.getDescription());
VehicleFactory truckFactory = new TruckFactory();
Product truck = truckFactory.createVehicle();
System.out.println("Name: " + truck.getName());
System.out.println("Description: " + truck.getDescription());
}
}

That's it! This is a basic tutorial on how to develop a Java factory developer. By following these steps, you can create a factory that provides the method for creating objects of different classes.