装饰模式的基本结构
classDiagram
class Component{
<<interface>>
+ operation();
}
class ConcreateComponent{
+ operation();
}
class Decrator{
- Component component;
+ operation();
}
class ConcreateDecrator1{
+ operation();
}
class ConcreateDecrator2{
+ operation();
}
ConcreateComponent ..|> Component
Decrator..|> Component
Decrator <|-- ConcreateDecrator1
Decrator <|-- ConcreateDecrator2
以实现不同的穿搭风格为例
classDiagram
class client{
main(String[] args)
}
class ICharacter{
<<interface>>
+ show();
}
class Finery{
- Component component;
+ operation();
}
class Persion{
- String name;
+ operation();
}
class Suit{
+ operation();
}
class Tie{
+ operation();
}
Persion ..|> ICharacter
Finery..|> ICharacter
Finery <|-- Suit
Finery <|-- Tie
client o-- Persion
Tie o-- Persion
Suit o-- Persion
个人形象抽象类
public interface ICharacter {
public void show();
}
人员实体类
public class Person implements ICharacter {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public void show() {
System.out.println("装扮的" + name);
}
}
装饰类
public class Finery implements ICharacter {
protected ICharacter component;
public void decorate(ICharacter component) {
this.component = component;
}
public void show() {
if (this.component != null) {
this.component.show();
}
}
}
服装类
西装
public class Suit extends Finery {
public void show() {
System.out.print(" 西装");
super.show();
}
}
领带
public class Tie extends Finery {
public void show() {
System.out.print(" 领带");
super.show();
}
}
调用
public static void main(String[] args) {
System.out.println("**********************************************");
System.out.println("《大话设计模式》代码样例");
System.out.println();
Person xc = new Person();
xc.setName("小菜");
System.out.println(" 第一种装扮：");
Tie ld = new Tie(); // 生成领带实例
ld.decorate(xc); // 领带装饰“有领带装饰的小菜”
Suit xz = new Suit(); // 生成西装实例
xz.decorate(ld); // 西装装饰“有领带西装装饰的小菜”
xz.show(); // 执行形象展示
System.out.println("**********************************************");
}