feat: 责任链模式-未完成。。。
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@ -479,7 +479,190 @@ public class CameraDemo {
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**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。
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### 简单示例
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#### 示例代码
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```java
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public class CommandDemo {
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public static void main(String[] args) {
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Receiver receiver = new Receiver();
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ConcreteCommand concreteCommand = new ConcreteCommand(receiver);
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Invoker invoker = new Invoker();
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invoker.setCommand(concreteCommand);
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invoker.invoke();
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}
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// 命令接口
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interface Command {
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/**
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* 执行方法
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*/
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void execute();
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}
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// 接受者
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static class Receiver {
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public void action() {
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System.out.println("接受者 执行。。。");
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}
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}
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// 具体的执行命令
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static class ConcreteCommand implements Command {
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private final Receiver receiver;
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public ConcreteCommand(Receiver receiver) {
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this.receiver = receiver;
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}
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/**
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* 执行方法
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*/
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@Override
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public void execute() {
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receiver.action();
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}
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}
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@Setter
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static class Invoker {
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private Command command;
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public void invoke() {
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command.execute();
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}
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}
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}
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```
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#### 执行结果：
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```java
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接受者 执行。。。
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```
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### 示例-烧烤店
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#### 示例代码
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```java
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public class BakeDemo {
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// 充当客户端
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public static void main(String[] args) {
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Waiter waiter = new Waiter();
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Barbecue barbecue = new Barbecue();
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waiter.addCommand(new BakeChickenWing(barbecue));
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waiter.addCommand(new BakeMutton(barbecue));
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waiter.notifyCommand();
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}
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// 接受者-厨师
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static class Barbecue {
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/**
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* 烤串
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*/
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public void bakeMutton() {
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System.out.println("开始烤串。。。");
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}
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/**
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* 烤鸡翅
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*/
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public void bakeChickenWing() {
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System.out.println("开始烤鸡翅。。。");
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}
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}
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// 请求者-invoker-服务员
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public static class Waiter {
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private final List<Command> commandList = new ArrayList<>();
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public void addCommand(Command command) {
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commandList.add(command);
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}
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/**
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* 通知厨师开始制作
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*/
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public void notifyCommand() {
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for (Command command : commandList) {
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command.execute();
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}
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}
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}
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public static abstract class Command {
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protected Barbecue barbecue;
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public Command(Barbecue barbecue) {
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this.barbecue = barbecue;
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}
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/**
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* 执行方法
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*/
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public abstract void execute();
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}
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// 命令-烤鸡翅
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public static class BakeChickenWing extends Command {
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public BakeChickenWing(Barbecue barbecue) {
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super(barbecue);
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}
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/**
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* 执行方法
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*/
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@Override
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public void execute() {
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barbecue.bakeChickenWing();
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}
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}
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// 命令-烤串
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public static class BakeMutton extends Command {
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public BakeMutton(Barbecue barbecue) {
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super(barbecue);
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}
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/**
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* 执行方法
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*/
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@Override
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public void execute() {
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barbecue.bakeMutton();
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}
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}
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}
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```
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#### 执行结果：
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```java
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开始烤鸡翅。。。
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开始烤串。。。
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```
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---
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## 工厂模式
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---
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@ -536,11 +719,6 @@ public class Singleton {
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- 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。
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- 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。
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#### 总结
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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**
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，它避免了同步开销，同时也能确保线程安全。
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- **优点**：
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1. 延迟加载，节省资源。
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2. 内存优化，只有在需要时才实例化。
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@ -579,8 +757,6 @@ public class Singleton {
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- **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。
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- **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。
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#### 总结
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- **优点**：简单、线程安全、性能高（没有锁机制）、实现方便。
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- **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）。
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@ -775,7 +951,7 @@ public class CommandDemo {
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}
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```
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#### 运行结果
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#### 运行结果：
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```java
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CommandDemo.Computer(CPU=Low CPU, RAM=Low RAM, hardDrive=Low Driver)
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@ -785,3 +961,89 @@ CommandDemo.Computer(CPU=Low CPU, RAM=Low RAM, hardDrive=Low Driver)
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CommandDemo.Computer(CPU=High CPU, RAM=High RAM, hardDrive=High Driver)
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```
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## 责任链模式-未完成。。。
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主要有两个角色：抽象处理者（Handler）、具体处理者（ConcreteHandler）
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### 简单示例
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#### 代码示例
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```java
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public class Chain {
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// 过滤垃圾请求，为了演示需要清除【垃圾，辣鸡，腊鸡】这些词
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public static void main(String[] args) {
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Handler handlerA = new ConcreteHandlerA();
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Handler handlerB = new ConcreteHandlerB();
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Handler handlerC = new ConcreteHandlerC();
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// 设置责任链
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handlerA.setNextHandler(handlerB);
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handlerB.setNextHandler(handlerC);
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// 发起请求
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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");
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}
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// ConcreteHandler类
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static class ConcreteHandlerA extends Handler {
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@Override
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public void handleRequest(String request) {
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// 处理"垃圾"
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String updatedRequest = request.replaceAll("垃圾", "");
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System.out.println("Handler A处理后: " + updatedRequest);
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if (nextHandler != null) {
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nextHandler.handleRequest(updatedRequest); // 传递修改后的请求
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}
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}
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}
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static class ConcreteHandlerB extends Handler {
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@Override
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public void handleRequest(String request) {
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// 处理"辣鸡"
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String updatedRequest = request.replaceAll("辣鸡", "");
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System.out.println("Handler B处理后: " + updatedRequest);
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if (nextHandler != null) {
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nextHandler.handleRequest(updatedRequest); // 传递修改后的请求
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}
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}
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}
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static class ConcreteHandlerC extends Handler {
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@Override
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public void handleRequest(String request) {
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// 处理"腊鸡"
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String updatedRequest = request.replaceAll("腊鸡", "");
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System.out.println("Handler C处理后: " + updatedRequest);
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if (nextHandler != null) {
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nextHandler.handleRequest(updatedRequest); // 传递修改后的请求
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}
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}
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}
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// Handler类
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@Setter
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abstract static class Handler {
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protected Handler nextHandler;
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public abstract void handleRequest(String request);
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}
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}
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```
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#### 运行结果：
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```java
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Handler A处理后: 过滤请求，为了演示需要清除【，辣鸡，腊鸡】这些词
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Handler B处理后: 过滤请求，为了演示需要清除【，，腊鸡】这些词
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Handler C处理后: 过滤请求，为了演示需要清除【，，】这些词
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```
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###
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@ -1,146 +1,58 @@
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package cn.bunny.pattern5.demo3;
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import lombok.Data;
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import lombok.Setter;
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public class CommandDemo {
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public static void main(String[] args) {
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ConcreteLowComputerBuilder concreteLowComputerBuilder = new ConcreteLowComputerBuilder();
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Director director = new Director(concreteLowComputerBuilder);
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director.constructComputer();
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System.out.println(concreteLowComputerBuilder.getComputer());
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Receiver receiver = new Receiver();
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System.out.println("\n-----------------分割线-----------------\n");
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ConcreteCommand concreteCommand = new ConcreteCommand(receiver);
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ConcreteHighComputerBuilder concreteHighComputerBuilder = new ConcreteHighComputerBuilder();
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director = new Director(concreteHighComputerBuilder);
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director.constructComputer();
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System.out.println(concreteHighComputerBuilder.getComputer());
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Invoker invoker = new Invoker();
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invoker.setCommand(concreteCommand);
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invoker.invoke();
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}
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// 构建产品接口
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interface ComputerBuilder {
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// 命令接口
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interface Command {
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/**
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* 构建 CPU 方法
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* 执行方法
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*/
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void buildCPU();
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/**
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* 构建 RAM 方法
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*/
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void buildRAM();
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/**
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* 构建 磁盘 方法
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*/
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void buildHardDrive();
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/**
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* 返回产品
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*
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* @return Computer
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*/
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Computer getComputer();
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void execute();
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}
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// 产品类
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@Data
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static class Computer {
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private String CPU;
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private String RAM;
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private String hardDrive;
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}
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// 构建低端产品
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static class ConcreteLowComputerBuilder implements ComputerBuilder {
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private final Computer computer = new Computer();
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/**
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* 构建 CPU 方法
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*/
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@Override
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public void buildCPU() {
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computer.setCPU("Low CPU");
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}
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/**
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* 构建 RAM 方法
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*/
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@Override
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public void buildRAM() {
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computer.setRAM("Low RAM");
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}
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/**
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* 构建 磁盘 方法
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*/
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@Override
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public void buildHardDrive() {
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computer.setHardDrive("Low Driver");
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}
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/**
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* 返回产品
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*
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* @return Computer
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*/
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@Override
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public Computer getComputer() {
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return computer;
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// 接受者
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static class Receiver {
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public void action() {
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System.out.println("接受者 执行。。。");
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}
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}
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// 构建高端产品
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static class ConcreteHighComputerBuilder implements ComputerBuilder {
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private final Computer computer = new Computer();
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// 具体的执行命令
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static class ConcreteCommand implements Command {
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/**
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* 构建 CPU 方法
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*/
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@Override
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public void buildCPU() {
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computer.setCPU("High CPU");
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private final Receiver receiver;
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public ConcreteCommand(Receiver receiver) {
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this.receiver = receiver;
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}
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/**
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* 构建 RAM 方法
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* 执行方法
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*/
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@Override
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public void buildRAM() {
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computer.setRAM("High RAM");
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}
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/**
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* 构建 磁盘 方法
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*/
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@Override
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public void buildHardDrive() {
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computer.setHardDrive("High Driver");
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}
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/**
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* 返回产品
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*
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* @return Computer
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*/
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@Override
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public Computer getComputer() {
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return computer;
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public void execute() {
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receiver.action();
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}
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}
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// 构建者
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public static class Director {
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private final ComputerBuilder builder;
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@Setter
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static class Invoker {
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private Command command;
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public Director(ComputerBuilder builder) {
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this.builder = builder;
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}
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public void constructComputer() {
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builder.buildCPU();
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builder.buildRAM();
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builder.buildHardDrive();
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public void invoke() {
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command.execute();
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}
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}
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}
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@ -0,0 +1,99 @@
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package cn.bunny.pattern5.demo4;
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import java.util.ArrayList;
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import java.util.List;
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public class BakeDemo {
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// 充当客户端
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public static void main(String[] args) {
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Waiter waiter = new Waiter();
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Barbecue barbecue = new Barbecue();
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waiter.addCommand(new BakeChickenWing(barbecue));
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waiter.addCommand(new BakeMutton(barbecue));
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waiter.notifyCommand();
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}
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// 接受者-厨师
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static class Barbecue {
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/**
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* 烤串
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*/
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public void bakeMutton() {
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System.out.println("开始烤串。。。");
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}
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/**
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* 烤鸡翅
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*/
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public void bakeChickenWing() {
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System.out.println("开始烤鸡翅。。。");
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}
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}
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// 请求者-invoker-服务员
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public static class Waiter {
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private final List<Command> commandList = new ArrayList<>();
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public void addCommand(Command command) {
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commandList.add(command);
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}
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/**
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* 通知厨师开始制作
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*/
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public void notifyCommand() {
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for (Command command : commandList) {
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command.execute();
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}
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}
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}
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public static abstract class Command {
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protected Barbecue barbecue;
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public Command(Barbecue barbecue) {
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this.barbecue = barbecue;
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}
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||||
|
||||
/**
|
||||
* 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();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue