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Decorator定义:(动态给一个对象添加一些额外的职责,就象在墙上刷油漆.使用Decorator模式相比用生成子类方式达到功能的扩充显得更为灵活.
为什么使用Decorator?
我们通常可以..
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贴一个学习当中的写的代码
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2003年10月07日 00:10
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标签列表
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public interface CoffeeImp {
public void pourCoffeeImp();
}
public class MilkCoffeeImp implements CoffeeImp {
public void pourCoffeeImp() {
System.out.println("加奶");
}
}
public class CandyCoffeeImp implements CoffeeImp {
public void pourCoffeeImp() {
System.out.println("加糖");
}
}
public class CrotonCoffeeImp implements CoffeeImp {
public void pourCoffeeImp() {
System.out.println("加巴豆:)");
}
}
public interface Coffee {
public void addFavoring();
public void pourCoffee();
}
public class MediumCoffee implements Coffee {//标准中杯咖啡
public void addFavoring(){
System.out.println("普通调料");
}
public void pourCoffee() {
System.out.println("中杯咖啡");
}
}
public class DecMedCoffee implements Coffee {//加料中杯咖啡
private Coffee mediumCoffee;
private List otherAction = new ArrayList();
public DecMedCoffee(MediumCoffee _mediumCoffee) {
this.mediumCoffee = _mediumCoffee;
}
public void addFavoring(CoffeeImp coffeeImp) {
otherAction.add(coffeeImp);
}
public void pourCoffee() {
mediumcoffee.addFavoring();
mediumCoffee.pourCoffee();
otherMehtod();
}
private void otherMethod() {
if (it != null) {
Iterator it = otherAction.iterator();
while(it.hasNext()) {
(CoffeeImp)it.next().pourCoffeeImp();
}
}
}
}
public class CoffeeImpSingleton {
private static CoffeeImp coffeeImp;
public CoffeeImpSingleton(CoffeeImp _coffeeImp){
this.coffeeImp = _coffeeImp;
}
public static CoffeeImp getCoffeeImpInstance() {
return coffeeImp;
}
}
具体实现：
CoffeeImpSingleton milkSingleton = new CoffeeImpSingleton(new MilkCoffeeImp());
CoffeeImpSingleton candySingleton = new CoffeeImpSingleton(new CandyMilkCoffeeImp());
CoffeeImpSingleton crotonSingleton = new CoffeeImpSingleton(new CrotonCoffeeImp());
Coffee mediumCoffee = new DecMedCoffee();
mediumCoffee.addFavoring(milkSingleton.getCoffeeImpInstance());
mediumCoffee.addFavoring(candySingleton.getCoffeeImpInstance());
mediumCoffee.addFavoring(crotonSingleton.getCoffeeImpInstance());
mdeiumCoffee.pourCoffee();
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Re: 贴一个学习当中的写的代码
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2003年10月10日 14:13
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Bridge模式，Bridge模式在实际使用中经常不知不觉用上，自己都没意识到，也许Java血液里就是强调抽象和行为分开的。
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Re: 贴一个学习当中的写的代码
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2003年10月10日 23:20
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可是我写的时候，是按Decorator模式思维写的。
下面再贴几个，BANQ能不能帮我看看模式用的是否恰当。
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CoR pattern
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2003年10月10日 23:21
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//CoR pattern
public abstract class Handler {
public void handleRequest(String request) {
if (!doMyHandle(request)) {
Handler nextHandler = getNextHandler();
if (nextHandler == null) return;
getNextHandler().handleRequest(request);
}
execute();
}
public abstract Handler getNextHandler();
public abstract boolean doMyHandle(Request request);
protected abstract void execute();
}
public class HelpHandler extends Handler {
public Handler getNextHandler() {
return new PrintHandler();
}
public boolean doMyHandle(Request request) {
return request.equals("help");
}
protected void execute() {
System.out.println("recept help request");
}
}
public class PrintHandler extends Handler {
public Handler getNextHandler() {
return new FormatHandler();
}
public boolean doMyHandle(Request request) {
return request.equals("print");
}
protected void execute() {
System.out.println("recept print request");
}
}
public class FormatHandler extends Handler {
public Handler getNextHandler() { return null; }
public boolean doMyHandle(Request request) {
return request.equals("format");
}
protected void execute() {
System.out.println("recept format request");
}
}
public class Test {
public static void main(String[] args) {
if (args.length != 1) {
System.err.println("Usage:java Test help|print|format");
return;
}
Handler handler = new HelpHandler();
handler.handlerRequest(args[0]);
}
}
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Command pattern
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2003年10月10日 23:22
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//Command pattern
public interface Handler {
public void handleRequest();
}
public class HelpHandler implements Handler {
public void handleRequest() {
System.out.println("help command");
}
}
public class PrintHandler implements Handler {
public void handleRequest() {
System.out.println("print command");
}
}
public class FormatHandler implements Handler {
public void handleRequest() {
System.out.println("format command");
}
}
public class Producer {
public static HashMap producerRequest() {
HashMap hs = new HashMap();
hs.put("help",new HelpHandler);
hs.put("print",new PrintHandler();
hs.put("format",new FormatHandler();
return hs;
}
}
public class TestCommand {
public static void main(String[] args) {
if (args.length != 1) {
System.err.println("Usage:java TestCommand help|print|format");
return;
}
HashMap hs = Producer.producerRequest();
if (!hs.containsKey(args[0])) return;
(Handler)hs.get(args[0]).handleRequest();
}
}
public interface Handler {
public void handleRequest();
}
public class HelpHandler implements Handler {
public void handleRequest() {
System.out.println("help command");
}
}
public class PrintHandler implements Handler {
public void handleRequest() {
System.out.println("print command");
}
}
public class FormatHandler implements Handler {
public void handleRequest() {
System.out.println("format command");
}
}
public class Producer {
public static HashMap producerRequest() {
HashMap hs = new HashMap();
hs.put("help",new HelpHandler);
hs.put("print",new PrintHandler();
hs.put("format",new FormatHandler();
return hs;
}
}
public class TestCommand {
public static void main(String[] args) {
if (args.length != 1) {
System.err.println("Usage:java TestCommand help|print|format");
return;
}
HashMap hs = Producer.producerRequest();
if (!hs.containsKey(args[0])) return;
(Handler)hs.get(args[0]).handleRequest();
}
}
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Visitor pattern
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2003年10月10日 23:23
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//Visitor pattern
public interface Visitor {
public void visit(Visitable visitable);
}
public interface VisitLikedList {
public void visitLinkedList(LinkedList linkedList);
}
public interface VisitArrayList {
public void visitLinkedList(ArrayList arrayList);
}
public interface Visitable {
public void accept(Visitor visitor);
}
public class LinkedListElement implements Visitable {
private LinkedList lList;
public LinkedListElement(LinkedList lList) {
this.lList = lList;
}
public LinkedList getList() {
return lList;
}
protected void accept(Visitor visitor) {
(VisitLinkedList)visitor.visitLinkedList(this.getList());
}
}
public class ArrayListElement implements Visitable {
private ArrayList aList;
public ArrayListElement(ArrayList aList) {
this.aList = aList;
}
public ArrayList getList() {
return aList;
}
protected void accept(Visitor visitor) {
(VisitArrayList)visitor.visitArrayList(this.getList();
}
}
public class ConcreteVisitor implements Vistior,VisitLinkedList,VisitArrayList {
public void visit(Visitable visitable) {
visitable.accept(this);
}
public void visitLinkedList(LinkedList lList) {
Iteraotr it = lList.iterator();
while(it.hasNext) {
System.out.println(it.Next());
}
}
public void visitArrayList(ArrayList aList) {
for(int i=0;i<aList.size();i++) {
System.out.println(aList.get(i));
}
}
}
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Re: 贴一个学习当中的写的代码
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2003年10月11日 14:21
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冲咖啡这个例子你有两个接口Coffeee和CoffeeImp
Decorator模式的一个重要特点是接口不变，Decoratee被粉刷者和粉刷者Decorator应该继承的是同一个接口，完成同样的行为。
其它例子都基本不错，没有背离各自模式的定义
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