《大话设计模式》java实现之装饰器模式

Decorator模式个人觉得应该翻译装饰器模式，书中用了装饰模式，个人习惯吧
UML图

代码结构

public class BigTrouser extends Finery {    @Override    public void show() {        super.show();               //书中装饰顺序反过来了，所以这里先写super可以使得顺序的正确        System.out.println("垮裤");    }}

public class Client {    public static void main(String[] args) {        Person xc = new Person("小菜");        System.out.println("第一种装扮");        BigTrouser kk = new BigTrouser();        Tshirts dtx = new Tshirts();        kk.decorate(xc);        dtx.decorate(kk);  //这两步体现了装饰的过程，与书中不使用模式的代码对比        dtx.show();    }}

public class Finery extends Person {    private Person component;    @Override    public void show() {        if(component != null) {            component.show();        }    }    public void decorate(Person component) {        this.component = component;    }}

public class Person {    private String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Person(String name) {        super();        this.name = name;    }    public Person() {        super();    }    public void show() {        System.out.println("装扮的" + name);    }}

public class Tshirts extends Finery {    @Override    public void show() {        super.show();                //书中装饰顺序反过来了，所以这里先写super可以使得顺序的正确        System.out.println("大T恤");    }}

注：注释中先写了super，书中在最后写super，主要是顺序的问题
其实java中有一个经典的装饰器模式，就是IO流，换一种实现方法就可以体现了，改后的代码如下：

public class BigTrouser extends Finery {    public BigTrouser(Person person) {        super(person);    }    @Override    public void show() {        super.show();        System.out.println("垮裤");    }}

public class Client {    public static void main(String[] args) {        Person person = new Person("小菜");        Finery finery = new TShirts(new BigTrouser(person));  //初始化时一层包一层，典型的java流的写法        finery.show();    }}

public abstract class Finery extends Person {    private Person person;    public Finery(Person person) {        this.person = person;    }    @Override    public void show() {        person.show();    }}

public class Person {    private String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Person(String name) {        super();        this.name = name;    }    public Person() {        super();    }    public void show() {        System.out.println("装扮的" + name);    }}

public class TShirts extends Finery {    public TShirts(Person person) {        super(person);    }    @Override    public void show() {        super.show();        System.out.println("T恤");    }}

主要关注Client中初始化的写法，new xxx(new xxx)这种写法就与java的IO流的写法一致。
装饰器模式主要是可以体现装饰的过程，就像前面中写的http://blog.csdn.net/linlinxie/article/details/78455946