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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(); } } 