From 503cdee2a00bbb10e7189eb55573c0179bb3b23d Mon Sep 17 00:00:00 2001 From: Bunny <1319900154@qq.com> Date: Sat, 1 Feb 2025 14:51:47 +0800 Subject: [PATCH] =?UTF-8?q?feat:=20=E8=A3=85=E9=A5=B0=E8=80=85=E6=A8=A1?= =?UTF-8?q?=E5=BC=8F?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../设计模式/image-20250201105537485.png | Bin 0 -> 16980 bytes .../设计模式/image-20250201105612849.png | Bin 0 -> 20218 bytes .../设计模式/image-20250201135138918.png | Bin 0 -> 7312 bytes README/设计模式.md | 114 ++++++++++++++++++ .../src/main/java/cn/bunny/pattern2/Main.java | 1 - .../cn/bunny/pattern4/demo1/BasicCar.java | 8 ++ .../java/cn/bunny/pattern4/demo1/Car.java | 5 + .../cn/bunny/pattern4/demo1/CarDecorator.java | 14 +++ .../cn/bunny/pattern4/demo1/LuxuryCar.java | 14 +++ .../java/cn/bunny/pattern4/demo1/Main.java | 14 +++ .../cn/bunny/pattern4/demo1/SportsCar.java | 14 +++ .../pattern4/demo2/BeautyCameraDecorator.java | 16 +++ .../java/cn/bunny/pattern4/demo2/Camera.java | 9 ++ .../bunny/pattern4/demo2/CameraDecorator.java | 10 ++ .../pattern4/demo2/FilterCameraDecorator.java | 16 +++ .../java/cn/bunny/pattern4/demo2/Main.java | 20 +++ .../bunny/pattern4/demo2/TakePhotoCamera.java | 11 ++ 17 files changed, 265 insertions(+), 1 deletion(-) create mode 100644 README/images/设计模式/image-20250201105537485.png create mode 100644 README/images/设计模式/image-20250201105612849.png create mode 100644 README/images/设计模式/image-20250201135138918.png create mode 100644 pattern/src/main/java/cn/bunny/pattern4/demo1/BasicCar.java create mode 100644 pattern/src/main/java/cn/bunny/pattern4/demo1/Car.java create mode 100644 pattern/src/main/java/cn/bunny/pattern4/demo1/CarDecorator.java create mode 100644 pattern/src/main/java/cn/bunny/pattern4/demo1/LuxuryCar.java create mode 100644 pattern/src/main/java/cn/bunny/pattern4/demo1/Main.java create mode 100644 pattern/src/main/java/cn/bunny/pattern4/demo1/SportsCar.java create mode 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z754xsDYAKGeH;Ho)n^<3J)YAaH5q@ts&u=tG>+^Ve~1rt>2(EUM~Nr#C*vxi{KSp3wDyldNjL z#}LV4=qGwwJR!l(NLCjvy_E*y7T7B=|YG$jYUZTdtyvjVYXEEQfYu^MSC`cPC~Y9 zKhvD}U&az&?62{tG27X~a+5Yk+MT!FD77fhSo9u1m_VB`Mv0DrMXm+-oILXx{gmIw zAJ$LL!V2uxyC@pr5@cPcpcovKxc!E0`u<o59XTH)~g>(s0E89}Z6c(_!l0W5?GCUZlvz)f$4EKaGI4x`7%@ Ih($ literal 0 HcmV?d00001 diff --git a/README/设计模式.md b/README/设计模式.md index a599277..8f848f0 100644 --- a/README/设计模式.md +++ b/README/设计模式.md @@ -733,5 +733,119 @@ public class Main { ## 装饰者模式 +装饰器模式是一种结构型设计模式，允许在不修改对象代码的前提下，动态地给一个对象添加额外的功能。它通过“包装”原始对象，使用一个或多个装饰器类对其功能进行增强或修改。 +简单来说，装饰器模式通过“装饰”原有对象来扩展功能，而不是通过继承来修改对象的行为。 +**汽车案例** + +假设你有一辆普通的车（**基本功能**），如果你想让这辆车变成运动型车或豪华车（**添加新功能**），你可以将这辆车包装在不同的装饰器中。例如： + +- **基本车**：一辆普通的车。 +- **运动型车**：在基本车上增加运动功能，比如加速性能、运动座椅等。 +- **豪华车**：在基本车上增加奢华功能，如高档内饰、音响系统等。 + +通过使用装饰器模式，你可以自由组合这些功能（运动型 + 豪华型），而不需要修改原有的 `Car` 类。 + +![image-20250201105537485](./images/设计模式/image-20250201105537485.png) + +**相机案例** + +![image-20250201105612849](./images/设计模式/image-20250201105612849.png) + +### 装饰器模式的结构 + +1. **Component（组件接口）**：定义了被装饰对象的共同行为，通常是一个接口或抽象类。 +2. **ConcreteComponent（具体组件）**：实现了 `Component` 接口，表示被装饰的对象。 +3. **Decorator（装饰器）**：实现 `Component` 接口，并持有一个 `Component` 对象，目的是对其进行包装。 +4. **ConcreteDecorator（具体装饰器）**：扩展了 `Decorator` 类，为 `Component` 添加额外的功能。 + +#### 优点 + +1. **灵活性**：装饰器模式可以通过动态地组合多个装饰器来实现功能的拓展，而不需要修改现有类或创建大量的子类。 +2. **遵循开放-封闭原则**：类对扩展开放，对修改封闭。你可以通过装饰器添加新功能，而无需修改现有的类代码。 +3. **功能复用**：装饰器模式支持组合多个装饰器，通过不同的装饰器组合可以重用已有的功能。 +4. **避免类膨胀**：与继承不同，装饰器模式避免了大量的子类创建，能够更灵活地对对象功能进行增强。 + +#### 缺点 + +1. **增加复杂性**：由于需要创建多个装饰器类，系统的结构可能变得更加复杂，维护和理解装饰器链条可能变得较为困难。 +2. **多层装饰会导致性能开销**：装饰器模式通常会创建多个小对象进行嵌套包装，导致性能开销增加，尤其在装饰器链条很长时。 +3. **难以管理装饰器的组合**：如果装饰器有依赖关系或需要特定的顺序才能正确工作，那么组合多个装饰器可能会变得更加困难，增加了使用的难度。 + +### 相机 + +#### 相机接口 + +```java +public interface Camera { + + /** + * 操作 + */ + void operation(); +} +``` + +#### 相机实现 + +```java +public class TakePhotoCamera implements Camera { + /** + * 操作 + */ + @Override + public void operation() { + System.out.println("拍照。。。"); + } +} + +public abstract class CameraDecorator implements Camera { + + final Camera camera; + + public CameraDecorator(Camera camera) { + this.camera = camera; + } +} + +public class FilterCameraDecorator extends CameraDecorator { + public FilterCameraDecorator(Camera camera) { + super(camera); + } + + /** + * 操作 + */ + @Override + public void operation() { + camera.operation(); + System.out.println("滤镜功能。。。"); + } +} +``` + +### 运行 + +```java +public class Main { + public static void main(String[] args) { + System.out.println("------------------执行简单的拍照-------------------"); + + TakePhotoCamera takePhotoCamera = new TakePhotoCamera(); + takePhotoCamera.operation(); + + System.out.println("-------------------需要美颜功能------------------"); + + BeautyCameraDecorator beautyCameraDecorator = new BeautyCameraDecorator(takePhotoCamera); + beautyCameraDecorator.operation(); + + System.out.println("-------------------需要美颜功能之后滤镜------------------"); + + FilterCameraDecorator filterCameraDecorator = new FilterCameraDecorator(beautyCameraDecorator); + filterCameraDecorator.operation(); + } +} +``` + +![image-20250201135138918](./images/设计模式/image-20250201135138918.png) diff --git a/pattern/src/main/java/cn/bunny/pattern2/Main.java b/pattern/src/main/java/cn/bunny/pattern2/Main.java index 866a5aa..cb91c9b 100644 --- a/pattern/src/main/java/cn/bunny/pattern2/Main.java +++ b/pattern/src/main/java/cn/bunny/pattern2/Main.java @@ -11,7 +11,6 @@ public class Main { modelDuck.performFly(); modelDuck.performQuack(); modelDuck.swim(); - System.out.println("--------------------------------"); AbstractDuck woodDuck = new WoodDuck(); diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo1/BasicCar.java b/pattern/src/main/java/cn/bunny/pattern4/demo1/BasicCar.java new file mode 100644 index 0000000..c5583d3 --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo1/BasicCar.java @@ -0,0 +1,8 @@ +package cn.bunny.pattern4.demo1; + +public class BasicCar implements Car { + @Override + public void assemble() { + System.out.println("Basic Car."); + } +} diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo1/Car.java b/pattern/src/main/java/cn/bunny/pattern4/demo1/Car.java new file mode 100644 index 0000000..7574fcf --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo1/Car.java @@ -0,0 +1,5 @@ +package cn.bunny.pattern4.demo1; + +public interface Car { + void assemble(); +} diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo1/CarDecorator.java b/pattern/src/main/java/cn/bunny/pattern4/demo1/CarDecorator.java new file mode 100644 index 0000000..2d2892f --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo1/CarDecorator.java @@ -0,0 +1,14 @@ +package cn.bunny.pattern4.demo1; + +public class CarDecorator implements Car { + protected Car decoratedCar; + + public CarDecorator(Car car) { + this.decoratedCar = car; + } + + @Override + public void assemble() { + this.decoratedCar.assemble(); + } +} diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo1/LuxuryCar.java b/pattern/src/main/java/cn/bunny/pattern4/demo1/LuxuryCar.java new file mode 100644 index 0000000..b8936cb --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo1/LuxuryCar.java @@ -0,0 +1,14 @@ +package cn.bunny.pattern4.demo1; + +public class LuxuryCar extends CarDecorator { + + public LuxuryCar(Car car) { + super(car); + } + + @Override + public void assemble() { + super.assemble(); + System.out.println("Adding features of Luxury Car."); + } +} diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo1/Main.java b/pattern/src/main/java/cn/bunny/pattern4/demo1/Main.java new file mode 100644 index 0000000..e5286f6 --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo1/Main.java @@ -0,0 +1,14 @@ +package cn.bunny.pattern4.demo1; + +public class Main { + + public static void main(String[] args) { + Car sportsCar = new SportsCar(new BasicCar()); + sportsCar.assemble(); // 输出: Basic Car. Adding features of Sports Car. + + System.out.println("\n*****"); + + Car sportsLuxuryCar = new SportsCar(new LuxuryCar(new BasicCar())); + sportsLuxuryCar.assemble(); // 输出: Basic Car. Adding features of Luxury Car. Adding features of Sports Car. + } +} diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo1/SportsCar.java b/pattern/src/main/java/cn/bunny/pattern4/demo1/SportsCar.java new file mode 100644 index 0000000..92d7b11 --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo1/SportsCar.java @@ -0,0 +1,14 @@ +package cn.bunny.pattern4.demo1; + +public class SportsCar extends CarDecorator { + + public SportsCar(Car car) { + super(car); + } + + @Override + public void assemble() { + super.assemble(); + System.out.println("Adding features of Sports Car."); + } +} diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo2/BeautyCameraDecorator.java b/pattern/src/main/java/cn/bunny/pattern4/demo2/BeautyCameraDecorator.java new file mode 100644 index 0000000..94798f9 --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo2/BeautyCameraDecorator.java @@ -0,0 +1,16 @@ +package cn.bunny.pattern4.demo2; + +public class BeautyCameraDecorator extends CameraDecorator { + public BeautyCameraDecorator(Camera camera) { + super(camera); + } + + /** + * 操作 + */ + @Override + public void operation() { + camera.operation(); + System.out.println("美颜功能相机。。。"); + } +} diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo2/Camera.java b/pattern/src/main/java/cn/bunny/pattern4/demo2/Camera.java new file mode 100644 index 0000000..18ba080 --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo2/Camera.java @@ -0,0 +1,9 @@ +package cn.bunny.pattern4.demo2; + +public interface Camera { + + /** + * 操作 + */ + void operation(); +} diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo2/CameraDecorator.java b/pattern/src/main/java/cn/bunny/pattern4/demo2/CameraDecorator.java new file mode 100644 index 0000000..914abe4 --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo2/CameraDecorator.java @@ -0,0 +1,10 @@ +package cn.bunny.pattern4.demo2; + +public abstract class CameraDecorator implements Camera { + + final Camera camera; + + public CameraDecorator(Camera camera) { + this.camera = camera; + } +} diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo2/FilterCameraDecorator.java b/pattern/src/main/java/cn/bunny/pattern4/demo2/FilterCameraDecorator.java new file mode 100644 index 0000000..9683bb1 --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo2/FilterCameraDecorator.java @@ -0,0 +1,16 @@ +package cn.bunny.pattern4.demo2; + +public class FilterCameraDecorator extends CameraDecorator { + public FilterCameraDecorator(Camera camera) { + super(camera); + } + + /** + * 操作 + */ + @Override + public void operation() { + camera.operation(); + System.out.println("滤镜功能。。。"); + } +} diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo2/Main.java b/pattern/src/main/java/cn/bunny/pattern4/demo2/Main.java new file mode 100644 index 0000000..e68c1bc --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo2/Main.java @@ -0,0 +1,20 @@ +package cn.bunny.pattern4.demo2; + +public class Main { + public static void main(String[] args) { + System.out.println("------------------执行简单的拍照-------------------"); + + TakePhotoCamera takePhotoCamera = new TakePhotoCamera(); + takePhotoCamera.operation(); + + System.out.println("-------------------需要美颜功能------------------"); + + BeautyCameraDecorator beautyCameraDecorator = new BeautyCameraDecorator(takePhotoCamera); + beautyCameraDecorator.operation(); + + System.out.println("-------------------需要美颜功能之后滤镜------------------"); + + FilterCameraDecorator filterCameraDecorator = new FilterCameraDecorator(beautyCameraDecorator); + filterCameraDecorator.operation(); + } +} diff --git a/pattern/src/main/java/cn/bunny/pattern4/demo2/TakePhotoCamera.java b/pattern/src/main/java/cn/bunny/pattern4/demo2/TakePhotoCamera.java new file mode 100644 index 0000000..b818e83 --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern4/demo2/TakePhotoCamera.java @@ -0,0 +1,11 @@ +package cn.bunny.pattern4.demo2; + +public class TakePhotoCamera implements Camera { + /** + * 操作 + */ + @Override + public void operation() { + System.out.println("拍照。。。"); + } +}