【GOF23设计模式】工厂模式

来源：http://www.bjsxt.com/ 
一、【GOF23设计模式】_简单工厂模式详解、面向对象设计原则、开闭原则、依赖反转原则、迪米特法则 

没有工厂模式的情况

package com.test.factory.simple;

public interface Car {
    public void run();
}

package com.test.factory.simple;

public class Audi implements Car{
    @Override
    public void run() {
        System.out.println("奥迪在跑");
    }
}

package com.test.factory.simple;

public class Byd implements Car{
    @Override
    public void run() {
        System.out.println("比亚迪在跑");
    }
}

package com.test.factory.simple;
/**
 * 测试没有工厂模式的情况下
 */
public class Client01 { //调用者   依赖Audi、Byd
    public static void main(String[] args) {
        Car c1 = new Audi();
        Car c2 = new Byd();

        c1.run();
        c2.run();
    }
}

简单工厂模式的情况

package com.test.factory.simple;

public class CarFactory {
    public static Car createCar(String type){
        if("奥迪".equals(type)){
            return new Audi();
        }else if("比亚迪".equals(type)){
            return new Byd();
        }else{
            return null;
        }
    }
}

package com.test.factory.simple;
/**
 * 简单工厂情况下
 */
public class Client02 { //调用者   不依赖Audi、Byd
    public static void main(String[] args) {
        Car c1 = CarFactory.createCar("奥迪");
        Car c2 = CarFactory.createCar("比亚迪");

        c1.run();
        c2.run();
    }
}

 
或者

package com.test.factory.simple;

public class CarFactory2 {
    public static Car createAudi(){
        return new Audi();
    }
    public static Car createByd(){
        return new Byd();
    }
}

package com.test.factory.simple;
/**
 * 简单工厂情况下
 */
public class Client03 { //调用者   不依赖Audi、Byd
    public static void main(String[] args) {
        Car c1 = CarFactory2.createAudi();
        Car c2 = CarFactory2.createByd();

        c1.run();
        c2.run();
    }
}

二、【GOF23设计模式】_工厂方法模式详解

package com.test.factory.factorymethod;

public interface Car {
    public void run();
}

package com.test.factory.factorymethod;

public class Audi implements Car{
    @Override
    public void run() {
        System.out.println("奥迪在跑");
    }
}

package com.test.factory.factorymethod;

public class Byd implements Car{
    @Override
    public void run() {
        System.out.println("比亚迪在跑");
    }
}

package com.test.factory.factorymethod;

public interface CarFactory {
    Car createCar();
}

package com.test.factory.factorymethod;

public class AudiFactory implements CarFactory{
    @Override
    public Car createCar() {
        return new Audi();
    }
}

package com.test.factory.factorymethod;

public class BydFactory implements CarFactory{
    @Override
    public Car createCar() {
        return new Byd();
    }
}

package com.test.factory.factorymethod;

public class Client {
    public static void main(String[] args) {
        Car c1 = new AudiFactory().createCar();
        Car c2 = new BydFactory().createCar();

        c1.run();
        c2.run();
    }
}

三、【GOF23设计模式】_抽象工厂模式详解 

package com.test.factory.abstractfactory;

public interface Engine {
    void run();
    void start();
}

class LuxuryEngine implements Engine{
    @Override
    public void run() {
        System.out.println("转得快");
    }

    @Override
    public void start() {
        System.out.println("启动快！可以自动启停");
    }
}

class LowEngine implements Engine{
    @Override
    public void run() {
        System.out.println("转得慢");
    }

    @Override
    public void start() {
        System.out.println("启动慢！");
    }
}

package com.test.factory.abstractfactory;

public interface Seat {
    void massage();
}

class LuxurySeat implements Seat{
    @Override
    public void massage() {
        System.out.println("可以自动按摩");
    }
}

class LowSeat implements Seat{
    @Override
    public void massage() {
        System.out.println("不能按摩");
    }
}

package com.test.factory.abstractfactory;

public interface Tyre {
    void revolve();
}

class LuxuryTyre implements Tyre{
    @Override
    public void revolve() {
        System.out.println("旋转不磨损");
    }
}

class LowTyre implements Tyre{
    @Override
    public void revolve() {
        System.out.println("旋转磨损快");
    }
}

package com.test.factory.abstractfactory;

public interface CarFactory {
    Engine createEngine();
    Seat createSeat();
    Tyre createTyre();
}

package com.test.factory.abstractfactory;

public class LuxuryFactory implements CarFactory{

    @Override
    public Engine createEngine() {
        return new LuxuryEngine();
    }

    @Override
    public Seat createSeat() {
        return new LuxurySeat();
    }

    @Override
    public Tyre createTyre() {
        return new LuxuryTyre();
    }
}

package com.test.factory.abstractfactory;

public class LowFactory implements CarFactory{

    @Override
    public Engine createEngine() {
        return new LowEngine();
    }

    @Override
    public Seat createSeat() {
        return new LowSeat();
    }

    @Override
    public Tyre createTyre() {
        return new LowTyre();
    }
}

package com.test.factory.abstractfactory;

public class Client {
    public static void main(String[] args) {
        CarFactory factory = new LuxuryFactory();
        Engine e = factory.createEngine();
        e.run();
        e.start();
    }
}