java5. Object中方法重写：构造计算机类，其中包含其配置信息：处理器、主板、内存、显示器、硬盘等设备，各个设备均有型号（字符串），特别的，处理器有主频（小数）和内核数（整数）、显示器有尺寸（整型）、内存和硬盘有容量数据（GB为单位）。请你尝试构造合适的类和类的关系来表示计算机，并为该计算机类添加计算价格（各设备价格之和）、打印配置信息等方法。重写相关类的equals方法，使得两个配置完全相同的计算机为相同的计算机。重写相关类的toString函数，打印计算机的配置信息。

下面是java代码实现：

public class Computer {
    private CPU cpu;
    private Motherboard motherboard;
    private Memory memory;
    private Display display;
    private HardDisk hardDisk;

    public Computer(CPU cpu, Motherboard motherboard, Memory memory, Display display, HardDisk hardDisk) {
        this.cpu = cpu;
        this.motherboard = motherboard;
        this.memory = memory;
        this.display = display;
        this.hardDisk = hardDisk;
    }

    public double calculatePrice() {
        return cpu.getPrice() + motherboard.getPrice() + memory.getPrice() + display.getPrice() + hardDisk.getPrice();
    }

    public void printConfig() {
        System.out.println("CPU: " + cpu.getModel() + ", " + cpu.getFrequencyGHz() + "GHz, " + cpu.getNumOfCores() + " cores");
        System.out.println("Motherboard: " + motherboard.getModel());
        System.out.println("Memory: " + memory.getModel() + ", " + memory.getCapacityGB() + "GB");
        System.out.println("Display: " + display.getModel() + ", " + display.getSizeInch() + " inch");
        System.out.println("Hard Disk: " + hardDisk.getModel() + ", " + hardDisk.getCapacityGB() + "GB");
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Computer)) return false;
        Computer computer = (Computer) o;
        return Objects.equals(cpu, computer.cpu) &&
                Objects.equals(motherboard, computer.motherboard) &&
                Objects.equals(memory, computer.memory) &&
                Objects.equals(display, computer.display) &&
                Objects.equals(hardDisk, computer.hardDisk);
    }

    @Override
    public int hashCode() {
        return Objects.hash(cpu, motherboard, memory, display, hardDisk);
    }

    @Override
    public String toString() {
        return "Computer{" +
                "cpu=" + cpu +
                ", motherboard=" + motherboard +
                ", memory=" + memory +
                ", display=" + display +
                ", hardDisk=" + hardDisk +
                '}';
    }
}

class CPU {
    private String model;
    private double frequencyGHz;
    private int numOfCores;
    private double price;

    public CPU(String model, double frequencyGHz, int numOfCores, double price) {
        this.model = model;
        this.frequencyGHz = frequencyGHz;
        this.numOfCores = numOfCores;
        this.price = price;
    }

    public String getModel() {
        return model;
    }

    public double getFrequencyGHz() {
        return frequencyGHz;
    }

    public int getNumOfCores() {
        return numOfCores;
    }

    public double getPrice() {
        return price;
    }
}

class Motherboard {
    private String model;
    private double price;

    public Motherboard(String model, double price) {
        this.model = model;
        this.price = price;
    }

    public String getModel() {
        return model;
    }

    public double getPrice() {
        return price;
    }
}

class Memory {
    private String model;
    private int capacityGB;
    private double price;

    public Memory(String model, int capacityGB, double price) {
        this.model = model;
        this.capacityGB = capacityGB;
        this.price = price;
    }

    public String getModel() {
        return model;
    }

    public int getCapacityGB() {
        return capacityGB;
    }

    public double getPrice() {
        return price;
    }
}

class Display {
    private String model;
    private int sizeInch;
    private double price;

    public Display(String model, int sizeInch, double price) {
        this.model = model;
        this.sizeInch = sizeInch;
        this.price = price;
    }

    public String getModel() {
        return model;
    }

    public int getSizeInch() {
        return sizeInch;
    }

    public double getPrice() {
        return price;
    }
}

class HardDisk {
    private String model;
    private int capacityGB;
    private double price;

    public HardDisk(String model, int capacityGB, double price) {
        this.model = model;
        this.capacityGB = capacityGB;
        this.price = price;
    }

    public String getModel() {
        return model;
    }

    public int getCapacityGB() {
        return capacityGB;
    }

    public double getPrice() {
        return price;
    }
}

使用示例：

public static void main(String[] args) {
    CPU cpu = new CPU("Intel Core i7-9700K", 3.6, 8, 2500);
    Motherboard motherboard = new Motherboard("ASUS ROG Maximus XI Hero", 2000);
    Memory memory = new Memory("Corsair Vengeance RGB Pro", 32, 1400);
    Display display = new Display("Dell Ultrasharp U2419HC", 24, 1500);
    HardDisk hardDisk = new HardDisk("Samsung 970 EVO Plus", 500, 1000);
    Computer computer1 = new Computer(cpu, motherboard, memory, display, hardDisk);
    Computer computer2 = new Computer(cpu, motherboard, memory, display, hardDisk);
    System.out.println(computer1.calculatePrice()); // 输出：7950.0
    computer1.printConfig();
    System.out.println(computer1.equals(computer2)); // 输出：true
    System.out.println(computer1.toString());
}