综合练习题自定义汽车类字段有汽车品牌、汽车价钱、汽车的颜色方法有跑、停要求封装当前类创建三个对象分别通过构造器初始化以及set方法初始化并打印汽车信息字段和方法

下面是一个符合要求的自定义汽车类的示例代码：

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

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

    public String getBrand() {
        return brand;
    }

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

    public double getPrice() {
        return price;
    }

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

    public String getColor() {
        return color;
    }

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

    public void run() {
        System.out.println("The car is running.");
    }

    public void stop() {
        System.out.println("The car has stopped.");
    }

    public static void main(String[] args) {
        Car car1 = new Car("Toyota", 20000.0, "Red");
        Car car2 = new Car("Honda", 25000.0, "Blue");

        Car car3 = new Car();
        car3.setBrand("BMW");
        car3.setPrice(50000.0);
        car3.setColor("Black");

        System.out.println("Car 1:");
        System.out.println("Brand: " + car1.getBrand());
        System.out.println("Price: " + car1.getPrice());
        System.out.println("Color: " + car1.getColor());
        car1.run();
        car1.stop();

        System.out.println("\nCar 2:");
        System.out.println("Brand: " + car2.getBrand());
        System.out.println("Price: " + car2.getPrice());
        System.out.println("Color: " + car2.getColor());
        car2.run();
        car2.stop();

        System.out.println("\nCar 3:");
        System.out.println("Brand: " + car3.getBrand());
        System.out.println("Price: " + car3.getPrice());
        System.out.println("Color: " + car3.getColor());
        car3.run();
        car3.stop();
    }
}

上述代码定义了一个名为Car的汽车类，包含私有字段brand、price和color，以及公有的getter和setter方法用于访问和修改这些字段的值。此外，还定义了run()和stop()方法，用于模拟汽车的行驶和停止操作。

在main()方法中，创建了三个Car对象，并通过构造器和setter方法初始化这些对象的字段。最后，使用System.out.println()打印了每个汽车对象的信息（品牌、价格、颜色），并调用了run()和stop()方法模拟汽车的行驶和停止操作