假定现在有这样一个需求：电脑可以由主板、硬盘、CPU、内存、显卡、显示器和键盘等元素构成，华硕公司可以生产里面的各种元素，Lenovo公司也可以生产里面的各种元素。假定你现在就想要一台电脑，这个电脑可以全部是来自华硕的品牌机，也可以是来自Lenovo的品牌机，也可以一部分元素来自华硕、另一部分来自Lenovo，请根据上述要求对代码进行设计，给出设计思路和源码。

        以下这段代码展示了一个简单的电脑组装系统。首先定义了不同的电脑元素接口，如主板、硬盘、CPU等。然后定义了电脑类 Computer，包含各种电脑组件，并通过 set 方法设置各个组件，最后通过 showInfo 方法展示电脑信息。

        接着有一个电脑建造者类 ComputerBuilder，其中包含了建造不同品牌电脑的方法，如 buildHSComputer（华硕电脑）、buildLenovoComputer（联想电脑）、buildCustomComputer（混合电脑），最后通过 getComputer 方法获取组装好的电脑。

        最后是 Director 类，包含了导演的角色，负责调用建造者类中的方法来组装不同品牌的电脑，并展示电脑的信息。

电脑元素接口：

//电脑元素接口
interface IMotherboard {void makeIMotherboard();}interface IHardDisk {void makeIHardDisk();}interface ICPU {void makeICPU();}interface IMemory {void makeIMemory();}interface IGraphicsCard {void makeIGraphicsCard();}interface IDisplay {void makeIDisplay();}interface IKeyboard {void makeIKeyboard();}

电脑类

//电脑
public class Computer {private IMotherboard motherboard;private IHardDisk hardDisk;private ICPU cpu;private IMemory memory;private IGraphicsCard graphicsCard;private IDisplay display;private IKeyboard keyboard;public void setMotherboard(IMotherboard motherboard) {this.motherboard = motherboard;}public void setHardDisk(IHardDisk hardDisk) {this.hardDisk = hardDisk;}public void setCpu(ICPU cpu) {this.cpu = cpu;}public void setMemory(IMemory memory) {this.memory = memory;}public void setGraphicsCard(IGraphicsCard graphicsCard) {this.graphicsCard = graphicsCard;}public void setDisplay(IDisplay display) {this.display = display;}public void setKeyboard(IKeyboard keyboard) {this.keyboard = keyboard;}public void showInfo() {if (motherboard != null) {motherboard.makeIMotherboard();}if (hardDisk != null) {hardDisk.makeIHardDisk();}if (cpu != null) {cpu.makeICPU();}if (memory != null) {memory.makeIMemory();}if (graphicsCard != null) {graphicsCard.makeIGraphicsCard();}if (display != null) {display.makeIDisplay();}if (keyboard != null) {keyboard.makeIKeyboard();}}}}

电脑建造者类

//电脑建造者
class ComputerBuilder {private Computer computer;public ComputerBuilder() {computer = new Computer();}public void buildHSComputer() {//华硕电脑computer.setMotherboard(new HSMotherboard());computer.setHardDisk(new HSHardDisk());computer.setCpu(new HSCPU());computer.setMemory(new HSMemory());computer.setGraphicsCard(new HSGraphicsCard());computer.setDisplay(new HSDisplay());computer.setKeyboard(new HSKeyboard());}public void buildLenovoComputer() {//联想电脑computer.setMotherboard(new LenovoMotherboard());computer.setHardDisk(new LenovoHardDisk());computer.setCpu(new LenovoCPU());computer.setMemory(new LenovoMemory());computer.setGraphicsCard(new LenovoGraphicsCard());computer.setDisplay(new LenovoDisplay());computer.setKeyboard(new LenovoKeyboard());}public void buildCustomComputer() {//建造混合电脑computer.setMotherboard(new HSMotherboard());computer.setHardDisk(new LenovoHardDisk());computer.setCpu(new LenovoCPU());computer.setMemory(new HSMemory());computer.setGraphicsCard(new LenovoGraphicsCard());computer.setDisplay(new LenvovDisplay());computer.setKeyboard(new HSKeyboard());}public Computer getComputer() {//获得组装好的电脑return computer;}}

导演类

//导演类
class Director {private ComputerBuilder builder = new ComputerBuilder();public void buildHSComputer() {// 华硕电脑builder.buildHSComputer();Computer hsComputer = builder.getComputer();hsComputer.showInfo();}public void buildLenovoComputer() {// 联想电脑builder.buildLenovoComputer();Computer lenovoComputer = builder.getComputer();lenovoComputer.showInfo();}public void buildCustomComputer() {// 混合电脑builder.buildCustomComputer();Computer customComputer = builder.getComputer();customComputer.showInfo();}}