feat: 桥接模式
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@ -1517,6 +1517,119 @@ public class Proxy {
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## 桥接模式---结构型
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桥接模式通过“桥接”抽象和实现，使得两者可以独立地变化。它通常应用于那些有多个维度可扩展的系统中，这样可以避免类爆炸，减少子类的数量，提升代码的可维护性。
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**需要角色**
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**Abstraction（抽象化角色）**：
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- 定义了抽象部分的接口，并且保持一个指向实现部分的引用。
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**RefinedAbstraction（扩充抽象化角色）**：
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- 继承自 Abstraction，通常会扩展其接口。
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**Implementor（实现者角色）**：
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- 定义了实现类的接口，这个接口不会太复杂，可以和抽象角色分离。
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**ConcreteImplementor（具体实现者角色）**：
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- 实现了 Implementor 接口，定义了具体的实现方式。
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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 Bridge {
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public static void main(String[] args) {
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// 使用不同的绘制方式
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Shape circle1 = new Circle(5, 10, 2, new DrawingAPI1()); // 使用屏幕绘制
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Shape circle2 = new Circle(10, 20, 3, new DrawingAPI2()); // 使用打印机绘制
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circle1.draw();
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circle2.draw();
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// 调整圆形大小
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circle1.resize(1.5);
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circle2.resize(0.5);
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circle1.draw();
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circle2.draw();
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}
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// Implementor: 定义绘制图形的接口
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interface DrawingAPI {
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void drawCircle(double x, double y, double radius);
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}
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// ConcreteImplementor: 屏幕绘制实现
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static class DrawingAPI1 implements DrawingAPI {
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@Override
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public void drawCircle(double x, double y, double radius) {
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System.out.println("Drawing Circle on Screen: (" + x + ", " + y + ") with radius " + radius);
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}
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}
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// ConcreteImplementor: 打印机绘制实现
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static class DrawingAPI2 implements DrawingAPI {
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@Override
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public void drawCircle(double x, double y, double radius) {
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System.out.println("Drawing Circle on Printer: (" + x + ", " + y + ") with radius " + radius);
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}
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}
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// Abstraction: 定义图形接口
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static abstract class Shape {
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protected DrawingAPI drawingAPI;
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protected Shape(DrawingAPI drawingAPI) {
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this.drawingAPI = drawingAPI;
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}
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public abstract void draw();
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public abstract void resize(double factor);
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}
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// RefinedAbstraction: 圆形
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static class Circle extends Shape {
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private final double x;
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private final double y;
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private double radius;
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public Circle(double x, double y, double radius, DrawingAPI drawingAPI) {
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super(drawingAPI);
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this.x = x;
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this.y = y;
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this.radius = radius;
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}
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@Override
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public void draw() {
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drawingAPI.drawCircle(x, y, radius);
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}
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@Override
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public void resize(double factor) {
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radius *= factor;
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}
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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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Drawing Circle on Screen: (5.0, 10.0) with radius 2.0
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Drawing Circle on Printer: (10.0, 20.0) with radius 3.0
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Drawing Circle on Screen: (5.0, 10.0) with radius 3.0
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Drawing Circle on Printer: (10.0, 20.0) with radius 1.5
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```
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---
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## 策略模式---行为型
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@ -2716,13 +2829,197 @@ public class Iterator {
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## 访问者模式---行为型
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访问者模式（Visitor Pattern）是一种行为设计模式，它允许你在不修改元素类的前提下，定义新的操作。通过使用访问者模式，可以将操作和元素的结构分离，从而让你在不修改元素类的情况下，向其中添加新的操作。
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**需要角色**
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**Element（元素）**：所有的元素类都需要实现此接口，它定义了`accept()`方法来接受访问者的访问。
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**ConcreteElement（具体元素）**：这是实现Element接口的类，代表具体的对象，可以是任何你希望执行操作的对象。
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**Visitor（访问者）**：这个接口定义了对所有元素类的访问方法。
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**ConcreteVisitor（具体访问者）**：这是实现Visitor接口的类，具体执行对元素的操作。
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**Object Structure（对象结构）**：一个包含所有元素对象的容器。它遍历所有元素对象并调用它们的`accept()`方法，传入访问者进行操作。
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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 VisitorDemo1 {
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public static void main(String[] args) {
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BusinessReport report = new BusinessReport();
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System.out.println("-------------------CEO-------------------");
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report.showReport(new CEOVisitor());
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System.out.println("-------------------CTO-------------------");
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report.showReport(new CTOVisitor());
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}
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// 访问者
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interface Visitor {
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/**
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* 访问者-工程师
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*/
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void visit(Engineer engineer);
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/**
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* 访问者-经理
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*/
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void visit(Manger manger);
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}
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// 具体访问者-CEO
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static class CEOVisitor implements Visitor {
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/**
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* 访问者-工程师
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*
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* @param engineer 工程师
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*/
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@Override
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public void visit(Engineer engineer) {
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System.out.println("工程师：" + engineer.name + "，KPI：" + engineer.kpi);
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}
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/**
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* 访问者-经理
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*
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* @param manger 经理
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*/
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@Override
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public void visit(Manger manger) {
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System.out.println("经理：" + manger.name + "，KPI：" + manger.kpi);
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}
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}
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// 具体访问者-CTO
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static class CTOVisitor implements Visitor {
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/**
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* 访问者-工程师
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*
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* @param engineer 工程师
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*/
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@Override
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public void visit(Engineer engineer) {
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System.out.println("工程师：" + engineer.name + "，代码行数：" + engineer.getCodeLines());
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}
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/**
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* 访问者-经理
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*
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* @param manger 经理
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*/
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@Override
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public void visit(Manger manger) {
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System.out.println("经理：" + manger.name + "，产品数：" + manger.getProducts());
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}
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}
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// 员工抽象
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static abstract class Employee {
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public String name;
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public int kpi;
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public Employee(String name) {
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this.name = name;
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this.kpi = new Random().nextInt(10);
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}
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// 接受访问者访问
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public abstract void accept(Visitor visitor);
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}
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// 员工具体---工程师
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static class Engineer extends Employee {
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public Engineer(String name) {
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super(name);
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}
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/**
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* @param visitor 访问者
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*/
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@Override
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public void accept(Visitor visitor) {
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visitor.visit(this);
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}
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public int getCodeLines() {
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return new Random().nextInt(10000);
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}
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}
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// 员工具体---经理
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static class Manger extends Employee {
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public Manger(String name) {
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super(name);
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}
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/**
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* @param visitor 访问者
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*/
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@Override
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public void accept(Visitor visitor) {
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visitor.visit(this);
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}
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public int getProducts() {
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return new Random().nextInt(10);
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}
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}
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// 员工报表类
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static class BusinessReport {
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private final List<Employee> employeeList = new ArrayList<>();
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public BusinessReport() {
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employeeList.add(new Manger("经理-A"));
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employeeList.add(new Manger("经理-B"));
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employeeList.add(new Manger("经理-C"));
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employeeList.add(new Manger("经理-D"));
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employeeList.add(new Manger("经理-E"));
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}
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public void showReport(Visitor visitor) {
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for (Employee employee : employeeList) {
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employee.accept(visitor);
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}
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}
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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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-------------------CEO-------------------
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经理：经理-A，KPI：9
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经理：经理-B，KPI：6
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经理：经理-C，KPI：7
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经理：经理-D，KPI：6
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经理：经理-E，KPI：9
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-------------------CTO-------------------
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经理：经理-A，产品数：7
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经理：经理-B，产品数：4
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经理：经理-C，产品数：9
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经理：经理-D，产品数：9
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经理：经理-E，产品数：2
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```
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---
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## 解释器模式---行为型
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---
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## 责任链模式---行为型-未完成。。。
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## 责任链模式---行为型
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主要有两个角色：抽象处理者（Handler）、具体处理者（Concrete Handler）
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@ -0,0 +1,77 @@
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package cn.bunny.pattern19;
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public class Bridge {
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public static void main(String[] args) {
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// 使用不同的绘制方式
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Shape circle1 = new Circle(5, 10, 2, new DrawingAPI1()); // 使用屏幕绘制
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Shape circle2 = new Circle(10, 20, 3, new DrawingAPI2()); // 使用打印机绘制
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circle1.draw();
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circle2.draw();
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// 调整圆形大小
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circle1.resize(1.5);
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circle2.resize(0.5);
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circle1.draw();
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circle2.draw();
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}
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// Implementor: 定义绘制图形的接口
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interface DrawingAPI {
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void drawCircle(double x, double y, double radius);
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}
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// ConcreteImplementor: 屏幕绘制实现
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static class DrawingAPI1 implements DrawingAPI {
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@Override
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public void drawCircle(double x, double y, double radius) {
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System.out.println("Drawing Circle on Screen: (" + x + ", " + y + ") with radius " + radius);
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}
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}
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// ConcreteImplementor: 打印机绘制实现
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static class DrawingAPI2 implements DrawingAPI {
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@Override
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public void drawCircle(double x, double y, double radius) {
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System.out.println("Drawing Circle on Printer: (" + x + ", " + y + ") with radius " + radius);
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}
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}
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// Abstraction: 定义图形接口
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static abstract class Shape {
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protected DrawingAPI drawingAPI;
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protected Shape(DrawingAPI drawingAPI) {
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this.drawingAPI = drawingAPI;
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}
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public abstract void draw();
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public abstract void resize(double factor);
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}
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// RefinedAbstraction: 圆形
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static class Circle extends Shape {
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private final double x;
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private final double y;
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private double radius;
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public Circle(double x, double y, double radius, DrawingAPI drawingAPI) {
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super(drawingAPI);
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this.x = x;
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this.y = y;
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this.radius = radius;
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}
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@Override
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public void draw() {
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drawingAPI.drawCircle(x, y, radius);
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}
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@Override
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public void resize(double factor) {
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radius *= factor;
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}
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}
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}
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@ -0,0 +1,65 @@
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package cn.bunny.pattern20;
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import java.util.Random;
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public class VisitorDemo {
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public static void main(String[] args) {
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}
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// 访问者
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interface Visitor {
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void visit(Visitor visitor);
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}
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// 员工抽象
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static abstract class Employee {
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public String name;
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public int kpi;
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public Employee(String name) {
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this.name = name;
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this.kpi = new Random().nextInt(10);
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}
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// 接受访问者访问
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public abstract void accept(Visitor visitor);
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}
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static class Engineer extends Employee {
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public Engineer(String name) {
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super(name);
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}
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/**
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* @param visitor 访问者
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*/
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@Override
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public void accept(Visitor visitor) {
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visitor.visit(visitor);
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}
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public int getCodeLines() {
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return new Random().nextInt(10000);
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}
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}
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static class Manger extends Employee {
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public Manger(String name) {
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super(name);
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}
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/**
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* @param visitor 访问者
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*/
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@Override
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public void accept(Visitor visitor) {
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visitor.visit(visitor);
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}
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public int getProducts() {
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return new Random().nextInt(10);
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}
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}
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}
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@ -0,0 +1,150 @@
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package cn.bunny.pattern20;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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public class VisitorDemo1 {
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public static void main(String[] args) {
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BusinessReport report = new BusinessReport();
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System.out.println("-------------------CEO-------------------");
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report.showReport(new CEOVisitor());
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System.out.println("-------------------CTO-------------------");
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report.showReport(new CTOVisitor());
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}
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// 访问者
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interface Visitor {
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/**
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* 访问者-工程师
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*/
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void visit(Engineer engineer);
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/**
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* 访问者-经理
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*/
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void visit(Manger manger);
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}
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// 具体访问者-CEO
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static class CEOVisitor implements Visitor {
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/**
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* 访问者-工程师
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*
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* @param engineer 工程师
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*/
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@Override
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public void visit(Engineer engineer) {
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System.out.println("工程师：" + engineer.name + "，KPI：" + engineer.kpi);
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}
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/**
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* 访问者-经理
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*
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* @param manger 经理
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*/
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@Override
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public void visit(Manger manger) {
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System.out.println("经理：" + manger.name + "，KPI：" + manger.kpi);
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}
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}
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// 具体访问者-CTO
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static class CTOVisitor implements Visitor {
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/**
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* 访问者-工程师
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*
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* @param engineer 工程师
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*/
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@Override
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public void visit(Engineer engineer) {
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System.out.println("工程师：" + engineer.name + "，代码行数：" + engineer.getCodeLines());
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}
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/**
|
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* 访问者-经理
|
||||
*
|
||||
* @param manger 经理
|
||||
*/
|
||||
@Override
|
||||
public void visit(Manger manger) {
|
||||
System.out.println("经理：" + manger.name + "，产品数：" + manger.getProducts());
|
||||
}
|
||||
}
|
||||
|
||||
// 员工抽象
|
||||
static abstract class Employee {
|
||||
public String name;
|
||||
public int kpi;
|
||||
|
||||
public Employee(String name) {
|
||||
this.name = name;
|
||||
this.kpi = new Random().nextInt(10);
|
||||
}
|
||||
|
||||
// 接受访问者访问
|
||||
public abstract void accept(Visitor visitor);
|
||||
}
|
||||
|
||||
// 员工具体---工程师
|
||||
static class Engineer extends Employee {
|
||||
|
||||
public Engineer(String name) {
|
||||
super(name);
|
||||
}
|
||||
|
||||
/**
|
||||
* @param visitor 访问者
|
||||
*/
|
||||
@Override
|
||||
public void accept(Visitor visitor) {
|
||||
visitor.visit(this);
|
||||
}
|
||||
|
||||
public int getCodeLines() {
|
||||
return new Random().nextInt(10000);
|
||||
}
|
||||
}
|
||||
|
||||
// 员工具体---经理
|
||||
static class Manger extends Employee {
|
||||
|
||||
public Manger(String name) {
|
||||
super(name);
|
||||
}
|
||||
|
||||
/**
|
||||
* @param visitor 访问者
|
||||
*/
|
||||
@Override
|
||||
public void accept(Visitor visitor) {
|
||||
visitor.visit(this);
|
||||
}
|
||||
|
||||
public int getProducts() {
|
||||
return new Random().nextInt(10);
|
||||
}
|
||||
}
|
||||
|
||||
// 员工报表类
|
||||
static class BusinessReport {
|
||||
private final List<Employee> employeeList = new ArrayList<>();
|
||||
|
||||
public BusinessReport() {
|
||||
employeeList.add(new Manger("经理-A"));
|
||||
employeeList.add(new Manger("经理-B"));
|
||||
employeeList.add(new Manger("经理-C"));
|
||||
employeeList.add(new Manger("经理-D"));
|
||||
employeeList.add(new Manger("经理-E"));
|
||||
}
|
||||
|
||||
public void showReport(Visitor visitor) {
|
||||
for (Employee employee : employeeList) {
|
||||
employee.accept(visitor);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue