Thinking in Java(7)

1.1 Java工厂模式(不适用匿名类)

public interface Service {    public void method1();    public void method2();}public interface ServiceFactory {    public Service getService();}import java.io.*;class Factory1 implements Service{    Factory1() {}    @Override    public void method1() {        // TODO Auto-generated method stub        System.out.println("工厂1生产了1号产品");    }    @Override    public void method2() {        // TODO Auto-generated method stub        System.out.println("工厂1生产了2号产品");    }}class Factory1Service implements ServiceFactory {    @Override    public Service getService() {        // TODO Auto-generated method stub        return new Factory1();    }}class Factory2 implements Service {    @Override    public void method1() {        // TODO Auto-generated method stub        System.out.println("工厂2生产了1号产品");    }    @Override    public void method2() {        // TODO Auto-generated method stub        System.out.println("工厂2生产了2号产品");    }    }class Factory2Service implements ServiceFactory {    @Override    public Service getService() {        // TODO Auto-generated method stub        return new Factory2();    }}public class Factories1 {    public static void go(ServiceFactory servicefactory) {        Service serv = servicefactory.getService();        serv.method1();        serv.method2();    }    public static void main(String[] args) {        go(new Factory1Service());        go(new Factory2Service());    }}

1.2 使用匿名类的实现

注意将工厂构造函数设为私有， 个人觉得这种方式很优雅

import java.io.*;class Factory3 implements Service {    private Factory3() {}    @Override    public void method1() {        // TODO Auto-generated method stub        System.out.println("工厂3生产了1号产品");    }    @Override    public void method2() {        // TODO Auto-generated method stub        System.out.println("工厂3生产了2号产品");    }    public static ServiceFactory factory3 =             new ServiceFactory() {                @Override                public Service getService() {                    // TODO Auto-generated method stub                    return new Factory3();                }            };}class Factory4 implements Service {    private Factory4() {}    @Override    public void method1() {        // TODO Auto-generated method stub        System.out.println("工厂4生产了1号产品");    }    @Override    public void method2() {        // TODO Auto-generated method stub        System.out.println("工厂4生产了2号产品");    }    public static ServiceFactory factory4 =             new ServiceFactory() {                @Override                public Service getService() {                    // TODO Auto-generated method stub                    return new Factory4();                }            };}public class Factories2 {    public static void go(ServiceFactory sf) {        Service serv = sf.getService();        serv.method1();        serv.method2();    }    public static void main(String[] args) {        go(Factory3.factory3);        go(Factory4.factory4);    }}