用Java写一个带可视化菜单的汽车管理系统，要求用文件输入输出

好的，我可以为您提供一个简单的汽车管理系统的实现。

首先，我们需要创建一个汽车类。这个类包含汽车的品牌、型号、颜色和价格等基本属性。代码如下：

public class Car {
    private String brand;
    private String model;
    private String color;
    private double price;

    public Car(String brand, String model, String color, double price) {
        this.brand = brand;
        this.model = model;
        this.color = color;
        this.price = price;
    }

    public String getBrand() {
        return brand;
    }

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

    public String getModel() {
        return model;
    }

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

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public double getPrice() {
        return price;
    }

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

    @Override
    public String toString() {
        return "Car{" +
                "brand='" + brand + '\'' +
                ", model='" + model + '\'' +
                ", color='" + color + '\'' +
                ", price=" + price +
                '}';
    }
}

接下来，我们需要创建一个汽车管理类。这个类包含了添加、查找、删除和显示所有汽车的方法。我们还需要使用文件输入输出来保存和读取汽车的信息。代码如下：

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class CarManager {
    private List<Car> cars = new ArrayList<>();
    private Scanner scanner = new Scanner(System.in);

    public void addCar() {
        System.out.println("请输入汽车品牌：");
        String brand = scanner.next();
        System.out.println("请输入汽车型号：");
        String model = scanner.next();
        System.out.println("请输入汽车颜色：");
        String color = scanner.next();
        System.out.println("请输入汽车价格：");
        double price = scanner.nextDouble();

        Car car = new Car(brand, model, color, price);
        cars.add(car);
        System.out.println("汽车添加成功！");
    }

    public void findCar() {
        System.out.println("请输入要查找的汽车品牌：");
        String brand = scanner.next();

        boolean found = false;
        for (Car car : cars) {
            if (car.getBrand().equals(brand)) {
                System.out.println(car);
                found = true;
            }
        }

        if (!found) {
            System.out.println("没有找到该品牌的汽车！");
        }
    }

    public void deleteCar() {
        System.out.println("请输入要删除的汽车品牌：");
        String brand = scanner.next();

        boolean deleted = false;
        for (Car car : cars) {
            if (car.getBrand().equals(brand)) {
                cars.remove(car);
                deleted = true;
                System.out.println("汽车删除成功！");
                break;
            }
        }

        if (!deleted) {
            System.out.println("没有找到该品牌的汽车！");
        }
    }

    public void displayAllCars() {
        if (cars.size() == 0) {
            System.out.println("没有汽车信息！");
            return;
        }

        for (Car car : cars) {
            System.out.println(car);
        }
    }

    public void saveToFile(String fileName) {
        try {
            FileWriter writer = new FileWriter(fileName);

            for (Car car : cars) {
                writer.write(car.getBrand() + "," + car.getModel() + "," + car.getColor() + "," + car.getPrice() + "\n");
            }

            writer.close();
            System.out.println("汽车信息保存成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void loadFromFile(String fileName) {
        try {
            FileReader reader = new FileReader(fileName);
            BufferedReader bufferedReader = new BufferedReader(reader);

            String line;
            while ((line = bufferedReader.readLine()) != null) {
                String[] parts = line.split(",");
                String brand = parts[0];
                String model = parts[1];
                String color = parts[2];
                double price = Double.parseDouble(parts[3]);

                Car car = new Car(brand, model, color, price);
                cars.add(car);
            }

            bufferedReader.close();
            reader.close();
            System.out.println("汽车信息加载成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

最后，我们需要创建一个主程序，来调用汽车管理类的方法，并提供用户界面。代码如下：

public class Main {
    public static void main(String[] args) {
        CarManager carManager = new CarManager();
        String fileName = "cars.txt";
        carManager.loadFromFile(fileName);

        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加汽车");
            System.out.println("2. 查找汽车");
            System.out.println("3. 删除汽车");
            System.out.println("4. 显示所有汽车");
            System.out.println("5. 保存汽车信息");
            System.out.println("6. 退出程序");

            int choice = carManager.scanner.nextInt();

            switch (choice) {
                case 1:
                    carManager.addCar();
                    break;
                case 2:
                    carManager.findCar();
                    break;
                case 3:
                    carManager.deleteCar();
                    break;
                case 4:
                    carManager.displayAllCars();
                    break;
                case 5:
                    carManager.saveToFile(fileName);
                    break;
                case 6:
                    carManager.saveToFile(fileName);
                    System.exit(0);
                    break;
                default:
                    System.out.println("无效的选择！");
                    break;
            }
        }
    }
}

这样，一个带可视化菜单的汽车管理系统就完成了。用户可以通过选择菜单来实现添加、查找、删除和显示所有汽车的操作，并且可以将汽车信息保存到文件中。