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Java 工厂模式学习
工厂模式分三种：简单工厂、工厂方法、抽象工厂。其中抽象工厂是用于多个产品族的情况。所谓产品族就是不同产品组成的有机整体，各不同产品之间相互依赖。打个比方，一台电脑有CPU、主板、内存和硬盘等，这些不同产品组成了一个产品族。就好比Dell和HP要把这些产品进行不同的组装，这时就需要用到抽象工厂。以下是代码演示：
简单工厂，可以用反射实现：
首先定义产品的抽象接口
package com.demo.SimpleFactory;public interface CPU { public void run();}
定义具体产品
package com.demo.SimpleFactory;public class Intel implements CPU { @Override public void run() { // TODO Auto-generated method stub System.out.println("This is Intel!"); }}
package com.demo.SimpleFactory;public class Amd implements CPU { @Override public void run() { // TODO Auto-generated method stub System.out.println("This is Amd!"); }}
定义工厂类
package com.demo.SimpleFactory;public class Factory { public static CPU create(String str) { CPU c = null; try { c = (CPU) Class.forName("com.demo.SimpleFactory." + str) .newInstance(); } catch (Exception e) { e.printStackTrace(); } return c; }}
测试如下
package com.demo.SimpleFactory;public class Test { public static void main(String[] args){ CPU c=Factory.create("Amd"); c.run(); }}
打印结果：
This is Amd!
工厂方法
首先定义产品的抽象接口
package com.demo.SimpleFactory;public interface CPU { public void run();}
定义具体产品
package com.demo.SimpleFactory;public class Intel implements CPU { @Override public void run() { // TODO Auto-generated method stub System.out.println("This is Intel!"); }}package com.demo.SimpleFactory;public class Amd implements CPU { @Override public void run() { // TODO Auto-generated method stub System.out.println("This is Amd!"); }}
定义抽象工厂，具体现实由其子类负责
package com.demo.FactoryMethod;public interface FactoryMethod { public CPU create();}
具体子类工厂
package com.demo.FactoryMethod;public class AmdFactory implements FactoryMethod { @Override public CPU create() { // TODO Auto-generated method stub return new Amd(); }}
package com.demo.FactoryMethod;public class IntelFactory implements FactoryMethod { public CPU create() { return new Intel(); }}
测试
package com.demo.FactoryMethod;public class Test { public static void main(String[] args) { FactoryMethod af=new IntelFactory(); CPU c=af.create(); c.run(); }}
打印结果：
This is Intel!
抽象工厂
首先定义产品的抽象接口
package com.demo.SimpleFactory;public interface CPU { public void run();}
定义具体产品
package com.demo.SimpleFactory;public class Intel implements CPU { @Override public void run() { // TODO Auto-generated method stub System.out.println("This is Intel!"); }}package com.demo.SimpleFactory;public class Amd implements CPU { @Override public void run() { // TODO Auto-generated method stub System.out.println("This is Amd!"); }}
package com.demo.AbstractFactory;public interface Memory { public void read(String str);}
package com.demo.AbstractFactory;public class KingstonMemory implements Memory { public KingstonMemory() { // TODO Auto-generated constructor stub } @Override public void read(String str) { // TODO Auto-generated method stub System.out.println("Kingston Read data is:"+str); }}
package com.demo.AbstractFactory;public class AdataMemory implements Memory { public AdataMemory() { // TODO Auto-generated constructor stub } @Override public void read(String str) { // TODO Auto-generated method stub System.out.println("Adata read data is:"+str); }}
定义抽象工厂
package com.demo.AbstractFactory;public interface AbstractFactory { public CPU createCPU(); public Memory createMemory();}
不同子类产生不同产品族
package com.demo.AbstractFactory;public class DellFactory implements AbstractFactory { @Override public CPU createCPU() { // TODO Auto-generated method stub return new Intel(); } @Override public Memory createMemory() { // TODO Auto-generated method stub return new KingstonMemory(); }}
package com.demo.AbstractFactory;public class HPFactory implements AbstractFactory { @Override public CPU createCPU() { // TODO Auto-generated method stub return new Amd(); } @Override public Memory createMemory() { // TODO Auto-generated method stub return new AdataMemory(); }}
测试
package com.demo.AbstractFactory;public class Test { public static void main(String[] args){ AbstractFactory hp=new HPFactory(); CPU cpu=hp.createCPU(); Memory memory=hp.createMemory(); cpu.run(); memory.read("Pass"); }}
打印结果：
This is Amd!
Adata read data is:Pass
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