Product：抽象产品角色，它定义了这个产品的通用属性，相当于模子，它定义了一些功能，这些功能可以由子类去实现

ConcreteProduct：具体产品角色，它实现了抽象产品所定义的功能，每个 ConcreteProduct 相当于一个产品种类

Factory：抽象工厂，它定义了所有工厂都应该具有的功能

ConcreteFactory：具体工厂模式类，它实现了抽象工厂定义的所有功能，负责创建具体的产品，它根据这个工厂的具体实现来生产具体的产品，但是这个产品也都具有符合抽象产品类定义的功能

 

 

Client:

package design.pattern.factory;public class Client {    public static void main(String[] args) {        Factory factory = new ConcreteFactory();        try {            System.out.println(factory.getProduct(ProductType.PA));            System.out.println(factory.getProduct(ProductType.PB));        } catch (Exception e) {            e.printStackTrace();            System.out.println("NO SUCH PRODUCT");        }    }}

 

Factory:

public interface Factory {    public Product getProduct(ProductType product) throws Exception;}

 

Product:

package design.pattern.factory;public abstract class Product {    protected String type;        protected Product(String type) {        this.type = type;    }        @Override    public String toString() {        return type;    }}

 

ConcreteFactory:

package design.pattern.factory;public final class ConcreteFactory implements Factory {    @Override    public Product getProduct(ProductType product) throws Exception {        switch (product) {        case PA:            return new ConcreteProductA("ConcreteProductA");        case PB:            return new ConcreteProductB("ConcreteProductB");        case PC:            return new ConcreteProductC("ConcreteProductC");        default:            throw new Exception();        }    }}

 

ConcreteProductA:

package design.pattern.factory;public final class ConcreteProductA extends Product {        public ConcreteProductA(String type) {        super(type);    }    }

 

ConcreteProductB:

package design.pattern.factory;public final class ConcreteProductB extends Product{    public ConcreteProductB(String type) {        super(type);    }}

 

ConcreProductC:

package design.pattern.factory;public final class ConcreteProductC extends Product{    public ConcreteProductC(String type) {        super(type);    }}

 

ProductType:

package design.pattern.factory;public enum ProductType {    PA,PB,PC;}