class Car
{
    private int num;
    private double gas;

    public Car()
    {
        num = 0;
        gas = 0.0;
        System.out.println("生產了汽車。");
    }

    public void setCar(int n, double g)
    {
        num = n;
        gas = g;
        System.out.println("已使車號為" + num + "，使汽油量為" + gas + "。");
    }

    public void show()
    {
        System.out.println("車號是" + num + "。");
        System.out.println("汽油量是" + gas + "。");
    }
}

public class HelloWorld
{
    public static void main(String args[])
    {
        Car cars[] = new Car[3];
        for(int i=0; i<cars.length; i++)
        {
            cars[i] = new Car();
        }

        cars[0].setCar(1234, 20.5);
        cars[1].setCar(2345, 30.5);
        cars[2].setCar(3456, 40.5);

        for(int i=0; i<cars.length; i++)
        {
            cars[i].show();
        }
    }
}