如何每3秒停车一次，然后继续开车

Question

我对Java和OOP有点新鲜。我的问题是： 我有一个带有驱动方法的称为汽车的抽象类。它还有另一个子类，称为AntiqueCar。古董汽车在驾驶3秒钟时停止工作。因此，它将在3秒钟后停止，但然后继续再次开车。 （我认为我可以在Antiquecar类中覆盖驱动器方法）我尝试了很多事情，但是我只是设法停止了古董汽车，但不能再用它。

这是驱动器方法：

public void drive(Dimension2D gameBoardSize) {
        if (this.crunched) {
            return;
        }
        double maxX = gameBoardSize.getWidth();
        double maxY = gameBoardSize.getHeight();
        // calculate delta between old coordinates and new ones based on speed and
        // direction
        double deltaX = this.speed * Math.sin(Math.toRadians(this.direction));
        double deltaY = this.speed * Math.cos(Math.toRadians(this.direction));
        double newX = this.position.getX() + deltaX;
        double newY = this.position.getY() + deltaY;

        // calculate position in case the boarder of the game board has been reached
        if (newX < 0) {
            newX = -newX;
            this.direction = MAX_ANGLE - this.direction;
        } else if (newX + this.size.getWidth() > maxX) {
            newX = 2 * maxX - newX - 2 * this.size.getWidth();
            this.direction = MAX_ANGLE - this.direction;
        }

        if (newY < 0) {
            newY = -newY;
            this.direction = HALF_ANGLE - this.direction;
            if (this.direction < 0) {
                this.direction = MAX_ANGLE + this.direction;
            }
        } else if (newY + this.size.getHeight() > maxY) {
            newY = 2 * maxY - newY - 2 * this.size.getHeight();
            this.direction = HALF_ANGLE - this.direction;
            if (this.direction < 0) {
                this.direction = MAX_ANGLE + this.direction;
            }
        }
        // set coordinates
        this.position = new Point2D(newX, newY);
    }

那是古董类：

public class AntiqueCar extends Car {

    private static final String ANTIQUE_CAR_IMAGE_FILE = "antiquecar.gif";
    // this car is middle-speeded. Not so fast, not so slow.
    private static final int MIN_SPEED_FAST_CAR = 2;
    private static final int MAX_SPEED_FAST_CAR = 7;

    public AntiqueCar(Dimension2D gameBoardSize) {
        super(gameBoardSize);
        setMinSpeed(MIN_SPEED_FAST_CAR);
        setMaxSpeed(MAX_SPEED_FAST_CAR);
        setRandomSpeed();
        setIconLocation(ANTIQUE_CAR_IMAGE_FILE);

    }

感谢任何帮助，谢谢！

Answer 1

派生类中的Override方法。因此，您可以从基类调用方法，然后睡三个秒：

public class AntiqueCar extends Car {

    public void drive(Dimension2D gameBoardSize) {
        super.drive(gameVoardSize);
        TimeUnit.SECONDS.sleep(1);    
    }

}