Java 如何创建一个LinkedList，每10秒添加一个圆，每15秒删除第一个元素（圆）

我已经完成了对圆圈的随机化，现在我的挑战是将圆圈添加到与实际队列类似的直线队列中（我希望圆圈从左到右排队，最好在帧的顶部。当我调用removeCircle（）时，我希望圆圈离开队列并在帧中向下移动。你能帮我处理addCircle（）吗和removeCircle（）方法。提前感谢您

public class AirTrafficLanding
{
private static void createAndShowUI()
{
    PlanePanel panel = new PlanePanel(1);

    JFrame frame = new JFrame("Air traffic Landing System");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
    frame.add( panel );
    frame.pack();
    frame.setVisible( true );

    panel.startAnimation();
}

public static void main(String[] args)
{
    EventQueue.invokeLater(new Runnable()
    {
        public void run()
        {
            createAndShowUI();
        }
    });

}

static class PlanePanel extends JPanel implements ActionListener
{
    private ArrayList<Plane> planes = new ArrayList<Plane>();

    public PlanePanel(int planeCount)
    {
        Dimension screenSize =  Toolkit.getDefaultToolkit().getScreenSize();

        setLayout( null );
        setBackground( Color.BLACK );

        Random random = new Random();

        for (int i = 0; i < planeCount; i++)
        {
            Plane plane = new Plane();
            plane.setRandomColor(true);
            plane.setLocation(0, 700);
            //plane.setLocation(random.nextInt(screenSize.width), random.nextInt(screenSize.height));
            plane.setMoveRate(32, 32, 1, 1, true);
            plane.setSize(32, 32);
            planes.add( plane );
        }
    }

    @Override
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);

        for (Plane plane: planes)
        {
            plane.draw(g);
        }
    }

    public void startAnimation()
    {
        Timer timer = new Timer(55, this);
        timer.start();
    }

    public void actionPerformed(ActionEvent e)
    {
        move();
        repaint();
    }

    private void move()
    {
        for (Plane plane : planes)
        {
            plane.move(this);
        }
    }
}

static class Plane
{
    public Color color = Color.BLACK;

    public int x = 0;
    public int y = 0;
    public int width  = 1;
    public int height = 1;

    private int moveX = 1;
    private int moveY = 1;
    private int directionX = 1;
    private int directionY = 1;
    private int xScale = moveX;
    private int yScale = moveY;

    private boolean randomMove = false;
    private boolean randomColor = false;
    private Random myRand = null;

    public Plane()
    {
        myRand = new Random();
        setRandomColor(randomColor);
    }

    public void move(JPanel parent)
    {
        int iRight = parent.getSize().width;
        int iBottom = parent.getSize().height;

        x += 5 + (xScale * directionX);
        y += 5 + (yScale * directionY);

        if (x <= 0)
        {
            x = 0;
            directionX *= (-1);
            xScale = randomMove ? myRand.nextInt(moveX) : moveX;
            if (randomColor) setRandomColor(randomColor);
        }

        if (x >= iRight - width)
        {
            x = iRight - width;
            directionX *= (-1);
            xScale = randomMove ? myRand.nextInt(moveX) : moveX;
            if (randomColor) setRandomColor(randomColor);
        }

        if (y <= 0)
        {
            y = 0;
            directionY *= (-1);
            yScale = randomMove ? myRand.nextInt(moveY) : moveY;
            if (randomColor) setRandomColor(randomColor);
        }

        if (y >= iBottom - height)
        {
            y = iBottom - height;
            directionY *= (-1);
            yScale = randomMove ? myRand.nextInt(moveY) : moveY;
            if (randomColor) setRandomColor(randomColor);
        }
    }

    public void draw(Graphics g)
    {
        g.setColor(color);
        g.fillOval(x, y, width, height);
    }

    public void setColor(Color c)
    {
        color = c;
    }

    public void setLocation(int x, int y)
    {
        this.x = x;
        this.y = y;
    }

    public void setMoveRate(int xMove, int yMove, int xDir, int yDir, boolean randMove)
    {
        this.moveX = xMove;
        this.moveY = yMove;
        directionX  = xDir;
        directionY  = yDir;
        randomMove  = randMove;
    }

    public void setRandomColor(boolean randomColor)
    {
        this.randomColor = randomColor;

        switch (myRand.nextInt(3))
        {
            case 0:  color = Color.ORANGE;
                     break;
            case 1:  color = Color.GREEN;
                     break;
            case 2:  color = Color.RED;
                     break;
            default: color = Color.BLACK;
                     break;
        }
    }

    public void setSize(int width, int height)
    {
        this.width  = width;
        this.height = height;
    }
}

公共级空中交通着陆
{
私有静态void createAndShowUI（）
{
刨花板=新刨花板（1）；
JFrame=新JFrame（“空中交通着陆系统”）；
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）；
setExtendedState（JFrame.MAXIMIZED_二者）；
框架。添加（面板）；
frame.pack（）；
frame.setVisible（true）；
panel.startAnimation（）；
}
公共静态void main（字符串[]args）
{
invokeLater（新的Runnable（）
{
公开募捐
{
createAndShowUI（）；
}
});
}
静态类PlanePanel扩展JPanel实现ActionListener
{
私有ArrayList平面=新ArrayList（）；
公共平面面板（int planeCount）
{
维度screenSize=Toolkit.getDefaultToolkit（）.getScreenSize（）；
setLayout（空）；
挫折地面（颜色：黑色）；
随机=新随机（）；
对于（int i=0；i

}

---

我希望从队列中的零个圆圈开始，每隔10秒添加一个圆圈。我希望每15秒有一个圆圈从队列移动到队列底部。我已经完成了随机圆圈，现在我的挑战是将圆圈添加到直线队列中，就像实际队列一样（我希望圆圈从左到右排队，最好在帧的顶部。当我调用removeCircle（）时，我希望圆圈离开队列并沿帧向下移动。你能帮我处理addCircle（）和removeCircle（）吗方法。提前谢谢。

解决问题应该一次解决一个问题。在开始测试之前，不要试图编写整个程序

public class AirTrafficLanding
{
private static void createAndShowUI()
{
    PlanePanel panel = new PlanePanel(1);

    JFrame frame = new JFrame("Air traffic Landing System");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
    frame.add( panel );
    frame.pack();
    frame.setVisible( true );

    panel.startAnimation();
}

public static void main(String[] args)
{
    EventQueue.invokeLater(new Runnable()
    {
        public void run()
        {
            createAndShowUI();
        }
    });

}

static class PlanePanel extends JPanel implements ActionListener
{
    private ArrayList<Plane> planes = new ArrayList<Plane>();

    public PlanePanel(int planeCount)
    {
        Dimension screenSize =  Toolkit.getDefaultToolkit().getScreenSize();

        setLayout( null );
        setBackground( Color.BLACK );

        Random random = new Random();

        for (int i = 0; i < planeCount; i++)
        {
            Plane plane = new Plane();
            plane.setRandomColor(true);
            plane.setLocation(0, 700);
            //plane.setLocation(random.nextInt(screenSize.width), random.nextInt(screenSize.height));
            plane.setMoveRate(32, 32, 1, 1, true);
            plane.setSize(32, 32);
            planes.add( plane );
        }
    }

    @Override
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);

        for (Plane plane: planes)
        {
            plane.draw(g);
        }
    }

    public void startAnimation()
    {
        Timer timer = new Timer(55, this);
        timer.start();
    }

    public void actionPerformed(ActionEvent e)
    {
        move();
        repaint();
    }

    private void move()
    {
        for (Plane plane : planes)
        {
            plane.move(this);
        }
    }
}

static class Plane
{
    public Color color = Color.BLACK;

    public int x = 0;
    public int y = 0;
    public int width  = 1;
    public int height = 1;

    private int moveX = 1;
    private int moveY = 1;
    private int directionX = 1;
    private int directionY = 1;
    private int xScale = moveX;
    private int yScale = moveY;

    private boolean randomMove = false;
    private boolean randomColor = false;
    private Random myRand = null;

    public Plane()
    {
        myRand = new Random();
        setRandomColor(randomColor);
    }

    public void move(JPanel parent)
    {
        int iRight = parent.getSize().width;
        int iBottom = parent.getSize().height;

        x += 5 + (xScale * directionX);
        y += 5 + (yScale * directionY);

        if (x <= 0)
        {
            x = 0;
            directionX *= (-1);
            xScale = randomMove ? myRand.nextInt(moveX) : moveX;
            if (randomColor) setRandomColor(randomColor);
        }

        if (x >= iRight - width)
        {
            x = iRight - width;
            directionX *= (-1);
            xScale = randomMove ? myRand.nextInt(moveX) : moveX;
            if (randomColor) setRandomColor(randomColor);
        }

        if (y <= 0)
        {
            y = 0;
            directionY *= (-1);
            yScale = randomMove ? myRand.nextInt(moveY) : moveY;
            if (randomColor) setRandomColor(randomColor);
        }

        if (y >= iBottom - height)
        {
            y = iBottom - height;
            directionY *= (-1);
            yScale = randomMove ? myRand.nextInt(moveY) : moveY;
            if (randomColor) setRandomColor(randomColor);
        }
    }

    public void draw(Graphics g)
    {
        g.setColor(color);
        g.fillOval(x, y, width, height);
    }

    public void setColor(Color c)
    {
        color = c;
    }

    public void setLocation(int x, int y)
    {
        this.x = x;
        this.y = y;
    }

    public void setMoveRate(int xMove, int yMove, int xDir, int yDir, boolean randMove)
    {
        this.moveX = xMove;
        this.moveY = yMove;
        directionX  = xDir;
        directionY  = yDir;
        randomMove  = randMove;
    }

    public void setRandomColor(boolean randomColor)
    {
        this.randomColor = randomColor;

        switch (myRand.nextInt(3))
        {
            case 0:  color = Color.ORANGE;
                     break;
            case 1:  color = Color.GREEN;
                     break;
            case 2:  color = Color.RED;
                     break;
            default: color = Color.BLACK;
                     break;
        }
    }

    public void setSize(int width, int height)
    {
        this.width  = width;
        this.height = height;
    }
}

因此，请将您的计划分解为基本内容：

动画需要一个计时器来移动每个对象。因此，首先向ArrayList添加一个对象，然后当计时器启动时，您迭代ArrayList并移动每个对象。ArrayList中只有一个对象可以启动并不重要

然后创建另一个每15秒触发一次的计时器，将另一个对象添加到ArrayList

然后添加逻辑，使该对象具有随机颜色

然后添加逻辑以赋予该对象优先级

---

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