Factory Pattern is a kind of Creation Pattern. Factory Pattern provides an interface for integration and hidden the complex implementation of related components.
The tutorial will help you create a factory pattern based on concept above.
Contents
I. Technology use for Factory Pattern
– Java 8
– Eclipse: Version: Mars.2 Release (4.5.2)
II. Overview Tutorial
Create a Car Factory Pattern as Java classes:
– Car interface
– Implements Car interface: Audi class, BMW class, Mercedes class.
– Implements Car Factory: CarFactory class.
– CarType class: defines all kind of car that Car Factory products.
III. Practices
1. Create a Car Interface
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public interface Car { String info(); } |
2. Implement Car Interface
– Create Audi class:
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public class Audi implements Car { int id; public Audi() { Random randomno = new Random(); id = randomno.nextInt(); } @Override public String info() { String msg = String.format("Hello World! I'm a new %s. My Id = %d", "Audi", id); return msg; } } |
– Create BMW class:
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public class BMW implements Car{ int id; public BMW() { Random randomno = new Random(); id = randomno.nextInt(); } @Override public String info() { String msg = String.format("Hello World! I'm a new %s. My Id = %d" , "BMW", id); return msg; } } |
– Create Mercedes class:
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public class Mercedes implements Car{ int id; public Mercedes() { Random randomno = new Random(); id = randomno.nextInt(); } @Override public String info() { String msg = String.format("Hello World! I'm a new %s. My Id = %d" , "Mercedes", id); return msg; } } |
3. Define Car Type
– Create CarType enum:
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public enum CarType { Mercedes, Audi, BMW } |
4. Create Car Factory
– Create CarFactory class:
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public class CarFactory { public Car produce(CarType type){ Car car = null; switch(type){ case Mercedes: car = new Mercedes(); break; case Audi: car = new Audi(); break; case BMW: car = new BMW(); break; default: break; } return car; } } |
5. Create Main Class
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public class MainClass { public static void main(String[] args) { List<Car> cars = new ArrayList<Car>(); CarFactory carFactory = new CarFactory(); cars.add(carFactory.produce(CarType.Mercedes)); cars.add(carFactory.produce(CarType.Audi)); cars.add(carFactory.produce(CarType.BMW)); for(Car c: cars){ System.out.println(c.info()); } } } |
IV. Run
Result
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Hello World! I'm a new Mercedes. My Id = 528695596 Hello World! I'm a new Audi. My Id = 1347512690 Hello World! I'm a new BMW. My Id = -2050050610 |
V. Sourcecode
Last updated on June 4, 2017.