工厂模式
工厂模式：“工厂”生活中是生产东西的地方，在Java世界里工厂是生产对象实例的。工厂的作用：使代码与实现类分离，这样方便我们替换实现。
工厂的动作：选择实现——根据条件提供对应的对象实例。
这几天学习了下《Thinking in Java》中“接口”这个章节。觉得该章中关于工厂的设计例子蛮有意思的，参照它写了如下一个例子：public interface Cycle {public void run();}
public class UniCycle implements Cycle {@Overridepublic void run() {// TODO Auto-generated method stubSystem.out.println("Cycle Run");}}
public class BiCycle implements Cycle {@Overridepublic void run() {// TODO Auto-generated method stubSystem.out.println("BiCycle Run");}}
public class TriCycle implements Cycle {@Overridepublic void run() {// TODO Auto-generated method stubSystem.out.println("TriCycle Run");}}
下面是工厂：public interface CycleFactory {public Cycle getCycle();}
public class UniCycleFactory implements CycleFactory {@Overridepublic Cycle getCycle() {// TODO Auto-generated method stubreturn new UniCycle();}}
public class BiCycleFactory implements CycleFactory {@Overridepublic Cycle getCycle() {// TODO Auto-generated method stubreturn new BiCycle();}}
public class TriCycleFactory implements CycleFactory {@Overridepublic Cycle getCycle() {// TODO Auto-generated method stubreturn new TriCycle();}}
测试代码：public class FactoryTest {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubrun(new UniCycleFactory().getCycle());run(new BiCycleFactory().getCycle());run(new TriCycleFactory().getCycle());run(new UniCycleFactory());run(new BiCycleFactory());run(new TriCycleFactory());}public static void run(Cycle cycle){cycle.run();}public static void run(CycleFactory cycleFactory){Cycle cycle = cycleFactory.getCycle();cycle.run();}}
运行结果:
Cycle Run
BiCycle Run
TriCycle Run
Cycle Run
BiCycle Run
TriCycle Run
感觉这样设计工厂有点做作，可能为了强调“接口”吧http://www.agoit.com/images/smiles/icon_smile.gif
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