public class Cannonball
{
    private double xPos = 0.0;
    private double yPos = 0.0;
    private double xVel = 0.0;
    private double yVel = 0.0;

    public Cannonball(double xInitPos)
    {
        this.xPos = xInitPos;
        this.yPos = 0.0;
    }

    public void move(double deltaSec)
    {
        xPos = xVel*deltaSec;
        yPos = yVel*deltaSec + 0.5*(-9.81)*(deltaSec)*(deltaSec);
        yVel = yVel + (-9.81)*(deltaSec);
    }

    public Point getPosition()
    {
        int xPosition = (int) xPos;
        int yPosition = (int) yPos;
        Point pos = new Point(xPosition, yPosition);
        return pos;
    }

    public ArrayList<Point> shoot(double alpha, double v, double deltaSec)
    {
        ArrayList<Point> posArray = new ArrayList<Point>();
        xVel = v * Math.cos(alpha);
        yVel = v * Math.sin(alpha);
        do
        {
            this.move(deltaSec);
            int xPosition = (int) xPos;
            int yPosition = (int) yPos;
            Point pos = new Point(xPosition, yPosition);
            posArray.add(pos);
        }
        while (yPos != 0);
        return posArray;
    }
}

public class Point
{
    public int x;
    public int y;

    public Point()
    {
         x=0; y=0;
    }

    public Point(int xx, int yy)
    {
        x=xx; y=yy;
    }

    public int getX()
    {
        return x;
    }

    public int getY()
    {
        return y;
    }
}