无法解析符号-Java中的打砖块游戏

Question

*删除了Irrelvant方法，例如块色等。

建立一个打砖块游戏，当然要使用多个类。 当从一个类到另一个类调用方法时，即时通讯出现问题，无法解析符号。

我尝试检查从该方法继承的类是否为公共类，还尝试使用该函数的getter（不确定是否可以，Java的新手）。

public class Rectangle {
    private double width;
    private double height;
    private Line[] rectangleLines;
    private Point upperLeft;

    /**
     * Instantiates a new Rectangle.
     *
     * @param upperLeft the upper left
     * @param width     the width
     * @param height    the height
     */
// Create a new rectangle with location and width/height.
    public Rectangle(Point upperLeft, double width, double height) {
        this.upperLeft = upperLeft;
        this.width = width;
        this.height = height;
        this.rectangleLines = new Line[4];
        this.initRectangleLines();
    }

    /**
     * Instantiates a new Rectangle.
     *
     * @param x      the x
     * @param y      the y
     * @param width  the width
     * @param height the height
     */
    public Rectangle(double x, double y, double width, double height) {
        this.upperLeft = new Point(x, y);
        this.width = width;
        this.height = height;
        this.rectangleLines = new Line[4];
        this.initRectangleLines();
    }

    private void initRectangleLines() {
        this.rectangleLines[0] = new Line(upperLeft, new Point(upperLeft.getX() + this.width, upperLeft.getY()));
        this.rectangleLines[1] = new Line(new Point(upperLeft.getX() + this.width, upperLeft.getY())
                , new Point(upperLeft.getX() + this.width, upperLeft.getY() + height));
        this.rectangleLines[2] = new Line(new Point(upperLeft.getX() + width, upperLeft.getY() + height)
                , new Point(upperLeft.getX(), upperLeft.getY() + height));
        this.rectangleLines[3] = new Line(new Point(upperLeft.getX(), upperLeft.getY() + height), upperLeft);
    }

    /**
     * Intersection points java . util . list.
     *
     * @param line the line
     * @return the java . util . list
     */
// Return a (possibly empty) List of intersection points
    // with the specified line.
    public java.util.List<Point> intersectionPoints(Line line) {

        List<Point> intersections = new ArrayList<Point>();
        for (int i = 0; i < rectangleLines.length; i++) {
            if (rectangleLines[i].isIntersecting(line))
                intersections.add(rectangleLines[i].intersectionWith(line));
        }
        /*for (Point element : intersections)
        {
        }*/
        return intersections;
    }



    /**
     * Gets top.
     *
     * @return the top
     */
    public Line getTop() {
        return this.rectangleLines[0];
    }

    /**
     * Gets right.
     *
     * @return the right
     */
    public Line getRight() {
        return this.rectangleLines[1];
    }

    /**
     * Gets bottom.
     *
     * @return the bottom
     */
    public Line getBottom() {
        return this.rectangleLines[2];
    }

    /**
     * Gets left.
     *
     * @return the left
     */
    public Line getLeft() {
        return this.rectangleLines[3];
    }

    /**
     * Gets width.
     *
     * @return the width
     */
// Return the width and height of the rectangle
    public double getWidth() {
        return this.width;
    }

    /**
     * Gets height.
     *
     * @return the height
     */
    public double getHeight() {
        return this.height;
    }

    /**
     * Gets upper left.
     *
     * @return the upper left
     */
// Returns the upper-left point of the rectangle.
    public Point getUpperLeft() {
        return this.upperLeft;
    }
    /**
     * Is colliding boolean.
     *
     * @param p the point.
     * @return the boolean
     */
    public boolean isColliding(Point p) {
        return this.upperLeft.getX() <= p.getX()
                && this.upperLeft.getX() + this.width >= p.getX()
                && this.upperLeft.getY() <= p.getY()
                && this.upperLeft.getY()+ this.height >= p.getY();
    }
}

import java.awt.*;

/**
 * The type Block.
 */
 public class Block implements Collidable {
    private Rectangle rect;
    private Color color;
    private int hits;


    /**
     * Instantiates a new Block.
     *
     * @param r the r
     * @param c the c
     * @param h the h
     */
    public Block(Rectangle r, Color c, int h) {
        this.rect = r;
        this.color = c;
        this.hits = h;
    }

    /**
     * Instantiates a new Block.
     *
     * @param upperLeft the upper left
     * @param width     the width
     * @param height    the height
     * @param c         the c
     * @param h         the h
     */
    public Block(Point upperLeft, double width, double height, Color c, int h) {
        this.rect = new Rectangle(upperLeft, width, height);
        this.color = c;
        this.hits = h;
    }


    @Override
    public Rectangle getCollisionRectangle() {
        return this.rect;
    }

    @Override
    public Velocity hit(Point collisionPoint, Velocity currentVelocity) {
        boolean changeX = false;
        boolean changeY = false;
        if (this.rect.getTop().isColliding(collisionPoint)){

    }
    }
}

问题出在最后一段，试图使用来自Block中Rectangle的isColliding并显示标题错误。