使用java语言设计一组类（至少3个类），分别表示计算机，台式机，笔记本，服务器（注意使用继承）

下面是使用Java语言设计的一组类，分别表示计算机，台式机，笔记本和服务器，其中台式机和笔记本都继承自计算机类，服务器则继承自台式机类。

public class Computer {
    private String brand;
    private String model;
    private int price;

    public Computer(String brand, String model, int price) {
        this.brand = brand;
        this.model = model;
        this.price = price;
    }

    public String getBrand() {
        return brand;
    }

    public String getModel() {
        return model;
    }

    public int getPrice() {
        return price;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public void setModel(String model) {
        this.model = model;
    }

    public void setPrice(int price) {
        this.price = price;
    }
}


public class Desktop extends Computer {
    private String cpu;
    private int memorySize;
    private int hardDiskSize;

    public Desktop(String brand, String model, int price, String cpu, int memorySize, int hardDiskSize) {
        super(brand, model, price);
        this.cpu = cpu;
        this.memorySize = memorySize;
        this.hardDiskSize = hardDiskSize;
    }

    public String getCpu() {
        return cpu;
    }

    public int getMemorySize() {
        return memorySize;
    }

    public int getHardDiskSize() {
        return hardDiskSize;
    }

    public void setCpu(String cpu) {
        this.cpu = cpu;
    }

    public void setMemorySize(int memorySize) {
        this.memorySize = memorySize;
    }

    public void setHardDiskSize(int hardDiskSize) {
        this.hardDiskSize = hardDiskSize;
    }
}


public class Laptop extends Computer {
    private String cpu;
    private int memorySize;
    private int hardDiskSize;
    private int batteryCapacity;

    public Laptop(String brand, String model, int price, String cpu, int memorySize, int hardDiskSize, int batteryCapacity) {
        super(brand, model, price);
        this.cpu = cpu;
        this.memorySize = memorySize;
        this.hardDiskSize = hardDiskSize;
        this.batteryCapacity = batteryCapacity;
    }

    public String getCpu() {
        return cpu;
    }

    public int getMemorySize() {
        return memorySize;
    }

    public int getHardDiskSize() {
        return hardDiskSize;
    }

    public int getBatteryCapacity() {
        return batteryCapacity;
    }

    public void setCpu(String cpu) {
        this.cpu = cpu;
    }

    public void setMemorySize(int memorySize) {
        this.memorySize = memorySize;
    }

    public void setHardDiskSize(int hardDiskSize) {
        this.hardDiskSize = hardDiskSize;
    }

    public void setBatteryCapacity(int batteryCapacity) {
        this.batteryCapacity = batteryCapacity;
    }
}


public class Server extends Desktop {
    private int numOfCPUs;
    private int numOfHardDisks;

    public Server(String brand, String model, int price, String cpu, int memorySize, int hardDiskSize, int numOfCPUs, int numOfHardDisks) {
        super(brand, model, price, cpu, memorySize, hardDiskSize);
        this.numOfCPUs = numOfCPUs;
        this.numOfHardDisks = numOfHardDisks;
    }

    public int getNumOfCPUs() {
        return numOfCPUs;
    }

    public int getNumOfHardDisks() {
        return numOfHardDisks;
    }

    public void setNumOfCPUs(int numOfCPUs) {
        this.numOfCPUs = numOfCPUs;
    }

    public void setNumOfHardDisks(int numOfHardDisks) {
        this.numOfHardDisks = numOfHardDisks;
    }
}