feat: 建造者模式
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@ -619,3 +619,169 @@ public class Main {
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}
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}
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```
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## 建造者模式
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### 简单示例
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比如我们要构建一个复杂的 `Computer`（计算机）对象。我们可以定义一个 `ComputerBuilder`，它将按顺序设置计算机的 CPU、内存、硬盘等组件，最后得到一个完整的 `Computer` 对象。
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#### 代码示例
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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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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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System.out.println("\n-----------------分割线-----------------\n");
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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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}
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// 构建产品接口
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interface ComputerBuilder {
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/**
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* 构建 CPU 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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}
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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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}
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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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/**
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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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}
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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("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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}
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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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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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}
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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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CommandDemo.Computer(CPU=Low CPU, RAM=Low RAM, hardDrive=Low Driver)
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-----------------分割线-----------------
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CommandDemo.Computer(CPU=High CPU, RAM=High RAM, hardDrive=High Driver)
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```
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@ -0,0 +1,146 @@
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package cn.bunny.pattern5.demo3;
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import lombok.Data;
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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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System.out.println("\n-----------------分割线-----------------\n");
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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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}
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// 构建产品接口
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interface ComputerBuilder {
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/**
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* 构建 CPU 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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}
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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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}
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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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/**
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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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}
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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("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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}
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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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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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}
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}
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}
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