From 21f806f2063e591aa75d5204e3fba2318fc4cb19 Mon Sep 17 00:00:00 2001 From: Bunny <1319900154@qq.com> Date: Sun, 2 Feb 2025 21:22:49 +0800 Subject: [PATCH] =?UTF-8?q?feat:=20=E8=B4=A3=E4=BB=BB=E9=93=BE=E6=A8=A1?= =?UTF-8?q?=E5=BC=8F-=E6=9C=AA=E5=AE=8C=E6=88=90=E3=80=82=E3=80=82?= =?UTF-8?q?=E3=80=82?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../设计模式-v2/image-20250201205232542.png | Bin 0 -> 20401 bytes .../设计模式-v2/image-20250201205350467.png | Bin 0 -> 13065 bytes .../设计模式-v2/image-20250202201204954.png | Bin 0 -> 15191 bytes README/设计模式-v2.md | 278 +++++++++++++++++- .../cn/bunny/pattern5/demo3/CommandDemo.java | 146 ++------- .../cn/bunny/pattern5/demo4/BakeDemo.java | 99 +++++++ .../java/cn/bunny/pattern6/BuilderDemo.java | 146 +++++++++ .../java/cn/bunny/pattern7/demo1/Chain.java | 69 +++++ 8 files changed, 613 insertions(+), 125 deletions(-) create mode 100644 README/images/设计模式-v2/image-20250201205232542.png create mode 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zXkhvw9%po`d#mFVHwi9p>EiJYyTCFWebu`>CaxR|H_!xbSs7iSpyaOeY4O1(KS6po zKaQX?_Q#77PyxbN2^Vx}4bCz}e7YHuUetO2)l}Y!9>s#iT^DiDAMq#xDal3eT zvfIP5_i&o7Tz&RG*VuS=mmb8qoDzM9_rCnvC+(=QK~1Ev&}CcR9CbANT6Fso)pGRp z8m%A#w%5 z2%_t32ghlTUuf{%0U0|KL@F3J41a2GF6u*&8<#XD{o);86}dChPWE$KU(qih5^H0+o?v~le;Tw5`Z=6Pb*rIpLtfSIpM1`xkAsO+8I2taulq{9 zDzSqj|K=k9m%+|I^<=-=z#$SdPS|PJxH{}~DW_OWLjiX92E(m3+EDk8(Gcw5XT8s# d_fFTc(=;bU62GAgv6ld-JXKdHfAaGE{{u?I&=LRu literal 0 HcmV?d00001 diff --git a/README/设计模式-v2.md b/README/设计模式-v2.md index 27f6720..e222a6c 100644 --- a/README/设计模式-v2.md +++ b/README/设计模式-v2.md @@ -479,7 +479,190 @@ public class CameraDemo { **Client**：客户端，负责创建并配置命令对象，将命令与接收者绑定，并传递给调用者执行。 +### 简单示例 +![image-20250201205350467](./images/设计模式-v2/image-20250201205350467.png) + +#### 示例代码 + +```java +public class CommandDemo { + public static void main(String[] args) { + Receiver receiver = new Receiver(); + + ConcreteCommand concreteCommand = new ConcreteCommand(receiver); + + Invoker invoker = new Invoker(); + invoker.setCommand(concreteCommand); + invoker.invoke(); + } + + // 命令接口 + interface Command { + + /** + * 执行方法 + */ + void execute(); + } + + // 接受者 + static class Receiver { + public void action() { + System.out.println("接受者 执行。。。"); + } + } + + // 具体的执行命令 + static class ConcreteCommand implements Command { + + private final Receiver receiver; + + public ConcreteCommand(Receiver receiver) { + this.receiver = receiver; + } + + /** + * 执行方法 + */ + @Override + public void execute() { + receiver.action(); + } + } + + @Setter + static class Invoker { + private Command command; + + public void invoke() { + command.execute(); + } + } +} +``` + +#### 执行结果： + +```java +接受者 执行。。。 +``` + +### 示例-烧烤店 + +![image-20250201205232542](./images/设计模式-v2/image-20250201205232542.png) + + + +#### 示例代码 + +```java +public class BakeDemo { + + // 充当客户端 + public static void main(String[] args) { + Waiter waiter = new Waiter(); + Barbecue barbecue = new Barbecue(); + + waiter.addCommand(new BakeChickenWing(barbecue)); + waiter.addCommand(new BakeMutton(barbecue)); + + waiter.notifyCommand(); + } + + // 接受者-厨师 + static class Barbecue { + + /** + * 烤串 + */ + public void bakeMutton() { + System.out.println("开始烤串。。。"); + } + + /** + * 烤鸡翅 + */ + public void bakeChickenWing() { + System.out.println("开始烤鸡翅。。。"); + } + } + + // 请求者-invoker-服务员 + public static class Waiter { + private final List commandList = new ArrayList<>(); + + public void addCommand(Command command) { + commandList.add(command); + } + + /** + * 通知厨师开始制作 + */ + public void notifyCommand() { + for (Command command : commandList) { + command.execute(); + } + } + } + + public static abstract class Command { + protected Barbecue barbecue; + + public Command(Barbecue barbecue) { + this.barbecue = barbecue; + } + + /** + * 执行方法 + */ + public abstract void execute(); + } + + // 命令-烤鸡翅 + public static class BakeChickenWing extends Command { + + public BakeChickenWing(Barbecue barbecue) { + super(barbecue); + } + + /** + * 执行方法 + */ + @Override + public void execute() { + barbecue.bakeChickenWing(); + } + } + + // 命令-烤串 + public static class BakeMutton extends Command { + + public BakeMutton(Barbecue barbecue) { + super(barbecue); + } + + /** + * 执行方法 + */ + @Override + public void execute() { + barbecue.bakeMutton(); + } + } +} +``` + +#### 执行结果： + +```java +开始烤鸡翅。。。 +开始烤串。。。 +``` + +--- + +## 工厂模式 --- @@ -536,11 +719,6 @@ public class Singleton { - 在低并发环境或单线程环境下，懒汉模式使用较为简单，不会有多线程安全问题。 - 对于高并发且需要频繁访问单例的场景，推荐使用**静态内部类**或**饿汉模式**来避免懒汉模式可能带来的性能问题。 -#### 总结 - -懒汉模式有时为了延迟初始化而牺牲了性能，特别是在多线程环境下。为了保证线程安全，可以采用双重检查锁定（DCL）或静态内部类的方式，而**静态内部类方式是最推荐的方式** -，它避免了同步开销，同时也能确保线程安全。 - - **优点**： 1. 延迟加载，节省资源。 2. 内存优化，只有在需要时才实例化。 @@ -579,8 +757,6 @@ public class Singleton { - **实例化不耗费太多资源**：如果单例对象的初始化过程非常轻量级且无须延迟初始化，可以使用饿汉模式。 - **类加载顺序固定**：如果不在乎单例对象在启动时是否初始化，且单例对象的初始化过程没有严重性能损失，可以选择饿汉模式。 -#### 总结 - - **优点**：简单、线程安全、性能高（没有锁机制）、实现方便。 - **缺点**：不支持延迟加载、可能会浪费资源（如果单例对象不常用时）。 @@ -775,7 +951,7 @@ public class CommandDemo { } ``` -#### 运行结果 +#### 运行结果： ```java CommandDemo.Computer(CPU=Low CPU, RAM=Low RAM, hardDrive=Low Driver) @@ -785,3 +961,89 @@ CommandDemo.Computer(CPU=Low CPU, RAM=Low RAM, hardDrive=Low Driver) CommandDemo.Computer(CPU=High CPU, RAM=High RAM, hardDrive=High Driver) ``` +## 责任链模式-未完成。。。 + +主要有两个角色：抽象处理者（Handler）、具体处理者（ConcreteHandler） + +![image-20250202201204954](./images/设计模式-v2/image-20250202201204954.png) + +### 简单示例 + +#### 代码示例 + +```java +public class Chain { + + // 过滤垃圾请求，为了演示需要清除【垃圾，辣鸡，腊鸡】这些词 + public static void main(String[] args) { + Handler handlerA = new ConcreteHandlerA(); + Handler handlerB = new ConcreteHandlerB(); + Handler handlerC = new ConcreteHandlerC(); + + // 设置责任链 + handlerA.setNextHandler(handlerB); + handlerB.setNextHandler(handlerC); + + // 发起请求 + handlerA.handleRequest("过滤垃圾请求，为了演示需要清除【垃圾，辣鸡，腊鸡】这些词"); + } + + // ConcreteHandler类 + static class ConcreteHandlerA extends Handler { + @Override + public void handleRequest(String request) { + // 处理"垃圾" + String updatedRequest = request.replaceAll("垃圾", ""); + System.out.println("Handler A处理后: " + updatedRequest); + + if (nextHandler != null) { + nextHandler.handleRequest(updatedRequest); // 传递修改后的请求 + } + } + } + + static class ConcreteHandlerB extends Handler { + @Override + public void handleRequest(String request) { + // 处理"辣鸡" + String updatedRequest = request.replaceAll("辣鸡", ""); + System.out.println("Handler B处理后: " + updatedRequest); + + if (nextHandler != null) { + nextHandler.handleRequest(updatedRequest); // 传递修改后的请求 + } + } + } + + static class ConcreteHandlerC extends Handler { + @Override + public void handleRequest(String request) { + // 处理"腊鸡" + String updatedRequest = request.replaceAll("腊鸡", ""); + System.out.println("Handler C处理后: " + updatedRequest); + + if (nextHandler != null) { + nextHandler.handleRequest(updatedRequest); // 传递修改后的请求 + } + } + } + + // Handler类 + @Setter + abstract static class Handler { + protected Handler nextHandler; + + public abstract void handleRequest(String request); + } +} +``` + +#### 运行结果： + +```java +Handler A处理后: 过滤请求，为了演示需要清除【，辣鸡，腊鸡】这些词 +Handler B处理后: 过滤请求，为了演示需要清除【，，腊鸡】这些词 +Handler C处理后: 过滤请求，为了演示需要清除【，，】这些词 +``` + +### diff --git a/pattern/src/main/java/cn/bunny/pattern5/demo3/CommandDemo.java b/pattern/src/main/java/cn/bunny/pattern5/demo3/CommandDemo.java index dc57cdf..9aa7c63 100644 --- a/pattern/src/main/java/cn/bunny/pattern5/demo3/CommandDemo.java +++ b/pattern/src/main/java/cn/bunny/pattern5/demo3/CommandDemo.java @@ -1,146 +1,58 @@ package cn.bunny.pattern5.demo3; -import lombok.Data; +import lombok.Setter; public class CommandDemo { public static void main(String[] args) { - ConcreteLowComputerBuilder concreteLowComputerBuilder = new ConcreteLowComputerBuilder(); - Director director = new Director(concreteLowComputerBuilder); - director.constructComputer(); - System.out.println(concreteLowComputerBuilder.getComputer()); + Receiver receiver = new Receiver(); - System.out.println("\n-----------------分割线-----------------\n"); - - ConcreteHighComputerBuilder concreteHighComputerBuilder = new ConcreteHighComputerBuilder(); - director = new Director(concreteHighComputerBuilder); - director.constructComputer(); - System.out.println(concreteHighComputerBuilder.getComputer()); + ConcreteCommand concreteCommand = new ConcreteCommand(receiver); + + Invoker invoker = new Invoker(); + invoker.setCommand(concreteCommand); + invoker.invoke(); } - // 构建产品接口 - interface ComputerBuilder { + // 命令接口 + interface Command { /** - * 构建 CPU 方法 + * 执行方法 */ - void buildCPU(); - - /** - * 构建 RAM 方法 - */ - void buildRAM(); - - /** - * 构建 磁盘 方法 - */ - void buildHardDrive(); - - /** - * 返回产品 - * - * @return Computer - */ - Computer getComputer(); + void execute(); } - // 产品类 - @Data - static class Computer { - private String CPU; - private String RAM; - private String hardDrive; - } - - // 构建低端产品 - static class ConcreteLowComputerBuilder implements ComputerBuilder { - private final Computer computer = new Computer(); - - /** - * 构建 CPU 方法 - */ - @Override - public void buildCPU() { - computer.setCPU("Low CPU"); - } - - /** - * 构建 RAM 方法 - */ - @Override - public void buildRAM() { - computer.setRAM("Low RAM"); - } - - /** - * 构建 磁盘 方法 - */ - @Override - public void buildHardDrive() { - computer.setHardDrive("Low Driver"); - } - - /** - * 返回产品 - * - * @return Computer - */ - @Override - public Computer getComputer() { - return computer; + // 接受者 + static class Receiver { + public void action() { + System.out.println("接受者 执行。。。"); } } - // 构建高端产品 - static class ConcreteHighComputerBuilder implements ComputerBuilder { - private final Computer computer = new Computer(); + // 具体的执行命令 + static class ConcreteCommand implements Command { - /** - * 构建 CPU 方法 - */ - @Override - public void buildCPU() { - computer.setCPU("High CPU"); + private final Receiver receiver; + + public ConcreteCommand(Receiver receiver) { + this.receiver = receiver; } /** - * 构建 RAM 方法 + * 执行方法 */ @Override - public void buildRAM() { - computer.setRAM("High RAM"); - } - - /** - * 构建 磁盘 方法 - */ - @Override - public void buildHardDrive() { - computer.setHardDrive("High Driver"); - } - - /** - * 返回产品 - * - * @return Computer - */ - @Override - public Computer getComputer() { - return computer; + public void execute() { + receiver.action(); } } - // 构建者 - public static class Director { - private final ComputerBuilder builder; + @Setter + static class Invoker { + private Command command; - public Director(ComputerBuilder builder) { - this.builder = builder; - } - - public void constructComputer() { - builder.buildCPU(); - builder.buildRAM(); - builder.buildHardDrive(); + public void invoke() { + command.execute(); } } } diff --git a/pattern/src/main/java/cn/bunny/pattern5/demo4/BakeDemo.java b/pattern/src/main/java/cn/bunny/pattern5/demo4/BakeDemo.java new file mode 100644 index 0000000..55921c1 --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern5/demo4/BakeDemo.java @@ -0,0 +1,99 @@ +package cn.bunny.pattern5.demo4; + +import java.util.ArrayList; +import java.util.List; + +public class BakeDemo { + + // 充当客户端 + public static void main(String[] args) { + Waiter waiter = new Waiter(); + Barbecue barbecue = new Barbecue(); + + waiter.addCommand(new BakeChickenWing(barbecue)); + waiter.addCommand(new BakeMutton(barbecue)); + + waiter.notifyCommand(); + } + + // 接受者-厨师 + static class Barbecue { + + /** + * 烤串 + */ + public void bakeMutton() { + System.out.println("开始烤串。。。"); + } + + /** + * 烤鸡翅 + */ + public void bakeChickenWing() { + System.out.println("开始烤鸡翅。。。"); + } + } + + // 请求者-invoker-服务员 + public static class Waiter { + private final List commandList = new ArrayList<>(); + + public void addCommand(Command command) { + commandList.add(command); + } + + /** + * 通知厨师开始制作 + */ + public void notifyCommand() { + for (Command command : commandList) { + command.execute(); + } + } + } + + public static abstract class Command { + protected Barbecue barbecue; + + public Command(Barbecue barbecue) { + this.barbecue = barbecue; + } + + /** + * 执行方法 + */ + public abstract void execute(); + } + + // 命令-烤鸡翅 + public static class BakeChickenWing extends Command { + + public BakeChickenWing(Barbecue barbecue) { + super(barbecue); + } + + /** + * 执行方法 + */ + @Override + public void execute() { + barbecue.bakeChickenWing(); + } + } + + // 命令-烤串 + public static class BakeMutton extends Command { + + public BakeMutton(Barbecue barbecue) { + super(barbecue); + } + + /** + * 执行方法 + */ + @Override + public void execute() { + barbecue.bakeMutton(); + } + } +} diff --git a/pattern/src/main/java/cn/bunny/pattern6/BuilderDemo.java b/pattern/src/main/java/cn/bunny/pattern6/BuilderDemo.java new file mode 100644 index 0000000..7a6287c --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern6/BuilderDemo.java @@ -0,0 +1,146 @@ +package cn.bunny.pattern6; + +import lombok.Data; + +public class BuilderDemo { + public static void main(String[] args) { + ConcreteLowComputerBuilder concreteLowComputerBuilder = new ConcreteLowComputerBuilder(); + Director director = new Director(concreteLowComputerBuilder); + director.constructComputer(); + System.out.println(concreteLowComputerBuilder.getComputer()); + + System.out.println("\n-----------------分割线-----------------\n"); + + ConcreteHighComputerBuilder concreteHighComputerBuilder = new ConcreteHighComputerBuilder(); + director = new Director(concreteHighComputerBuilder); + director.constructComputer(); + System.out.println(concreteHighComputerBuilder.getComputer()); + } + + // 构建产品接口 + interface ComputerBuilder { + + /** + * 构建 CPU 方法 + */ + void buildCPU(); + + /** + * 构建 RAM 方法 + */ + void buildRAM(); + + /** + * 构建 磁盘 方法 + */ + void buildHardDrive(); + + /** + * 返回产品 + * + * @return Computer + */ + Computer getComputer(); + } + + // 产品类 + @Data + static class Computer { + private String CPU; + private String RAM; + private String hardDrive; + } + + // 构建低端产品 + static class ConcreteLowComputerBuilder implements ComputerBuilder { + private final Computer computer = new Computer(); + + /** + * 构建 CPU 方法 + */ + @Override + public void buildCPU() { + computer.setCPU("Low CPU"); + } + + /** + * 构建 RAM 方法 + */ + @Override + public void buildRAM() { + computer.setRAM("Low RAM"); + } + + /** + * 构建 磁盘 方法 + */ + @Override + public void buildHardDrive() { + computer.setHardDrive("Low Driver"); + } + + /** + * 返回产品 + * + * @return Computer + */ + @Override + public Computer getComputer() { + return computer; + } + } + + // 构建高端产品 + static class ConcreteHighComputerBuilder implements ComputerBuilder { + private final Computer computer = new Computer(); + + /** + * 构建 CPU 方法 + */ + @Override + public void buildCPU() { + computer.setCPU("High CPU"); + } + + /** + * 构建 RAM 方法 + */ + @Override + public void buildRAM() { + computer.setRAM("High RAM"); + } + + /** + * 构建 磁盘 方法 + */ + @Override + public void buildHardDrive() { + computer.setHardDrive("High Driver"); + } + + /** + * 返回产品 + * + * @return Computer + */ + @Override + public Computer getComputer() { + return computer; + } + } + + // 构建者 + public static class Director { + private final ComputerBuilder builder; + + public Director(ComputerBuilder builder) { + this.builder = builder; + } + + public void constructComputer() { + builder.buildCPU(); + builder.buildRAM(); + builder.buildHardDrive(); + } + } +} diff --git a/pattern/src/main/java/cn/bunny/pattern7/demo1/Chain.java b/pattern/src/main/java/cn/bunny/pattern7/demo1/Chain.java new file mode 100644 index 0000000..5e39e23 --- /dev/null +++ b/pattern/src/main/java/cn/bunny/pattern7/demo1/Chain.java @@ -0,0 +1,69 @@ +package cn.bunny.pattern7.demo1; + +import lombok.Setter; + +public class Chain { + + // 过滤垃圾请求，为了演示需要清除【垃圾，辣鸡，腊鸡】这些词 + public static void main(String[] args) { + Handler handlerA = new ConcreteHandlerA(); + Handler handlerB = new ConcreteHandlerB(); + Handler handlerC = new ConcreteHandlerC(); + + // 设置责任链 + handlerA.setNextHandler(handlerB); + handlerB.setNextHandler(handlerC); + + // 发起请求 + handlerA.handleRequest("过滤垃圾请求，为了演示需要清除【垃圾，辣鸡，腊鸡】这些词"); + } + + // ConcreteHandler类 + static class ConcreteHandlerA extends Handler { + @Override + public void handleRequest(String request) { + // 处理"垃圾" + String updatedRequest = request.replaceAll("垃圾", ""); + System.out.println("Handler A处理后: " + updatedRequest); + + if (nextHandler != null) { + nextHandler.handleRequest(updatedRequest); // 传递修改后的请求 + } + } + } + + static class ConcreteHandlerB extends Handler { + @Override + public void handleRequest(String request) { + // 处理"辣鸡" + String updatedRequest = request.replaceAll("辣鸡", ""); + System.out.println("Handler B处理后: " + updatedRequest); + + if (nextHandler != null) { + nextHandler.handleRequest(updatedRequest); // 传递修改后的请求 + } + } + } + + static class ConcreteHandlerC extends Handler { + @Override + public void handleRequest(String request) { + // 处理"腊鸡" + String updatedRequest = request.replaceAll("腊鸡", ""); + System.out.println("Handler C处理后: " + updatedRequest); + + if (nextHandler != null) { + nextHandler.handleRequest(updatedRequest); // 传递修改后的请求 + } + } + } + + // Handler类 + @Setter + abstract static class Handler { + protected Handler nextHandler; + + public abstract void handleRequest(String request); + } +} +