如下给出抽象图形类（Graph）和坐标点类Point。 1)设计其抽象子类二维图形（TwoDGraph），添加计算面积calArea()和周长calPerimeter()两个抽象方法； 2)从TwoDGraph类派生出圆形Circle，增加圆心centerPoint和半径radius属性，增加构造方法； 3)在Circle中重写calArea、calPerimeter和toString()方法 4)从TwoDGraph类派生出长方形Rectangle，增加左上角坐标leftPoint、长length和宽width属性，增加构造方法； 5)在Rectangle中重写calArea、calPerimeter和toString()方法 6)在Rectangle新增输出4个顶点坐标方法outputPoints() 在main方法中，测试Circle和Rectangle类中的方法。

好的，我明白了。以下是代码实现：

abstract class Graph {
    abstract void draw();
}

class Point {
    int x;
    int y;

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

abstract class TwoDGraph extends Graph {
    abstract double calArea();
    abstract double calPerimeter();
}

class Circle extends TwoDGraph {
    Point centerPoint;
    double radius;

    public Circle(Point centerPoint, double radius) {
        this.centerPoint = centerPoint;
        this.radius = radius;
    }

    @Override
    void draw() {
        System.out.println("Drawing Circle...");
    }

    @Override
    double calArea() {
        return Math.PI * radius * radius;
    }

    @Override
    double calPerimeter() {
        return 2 * Math.PI * radius;
    }

    @Override
    public String toString() {
        return "Circle with center at (" + centerPoint.x + ", " + centerPoint.y + ") and radius " + radius;
    }
}

class Rectangle extends TwoDGraph {
    Point leftPoint;
    int length;
    int width;

    public Rectangle(Point leftPoint, int length, int width) {
        this.leftPoint = leftPoint;
        this.length = length;
        this.width = width;
    }

    @Override
    void draw() {
        System.out.println("Drawing Rectangle...");
    }

    @Override
    double calArea() {
        return length * width;
    }

    @Override
    double calPerimeter() {
        return 2 * (length + width);
    }

    @Override
    public String toString() {
        return "Rectangle with left point at (" + leftPoint.x + ", " + leftPoint.y + "), length " + length + ", and width " + width;
    }

    public void outputPoints() {
        Point rightPoint = new Point(leftPoint.x + length, leftPoint.y);
        Point bottomPoint = new Point(leftPoint.x, leftPoint.y + width);
        Point rightBottomPoint = new Point(rightPoint.x, bottomPoint.y);

        System.out.println("Top left point: (" + leftPoint.x + ", " + leftPoint.y + ")");
        System.out.println("Top right point: (" + rightPoint.x + ", " + rightPoint.y + ")");
        System.out.println("Bottom left point: (" + bottomPoint.x + ", " + bottomPoint.y + ")");
        System.out.println("Bottom right point: (" + rightBottomPoint.x + ", " + rightBottomPoint.y + ")");
    }
}

public class Main {
    public static void main(String[] args) {
        Circle c = new Circle(new Point(0, 0), 5);
        System.out.println(c);
        System.out.println("Area: " + c.calArea());
        System.out.println("Perimeter: " + c.calPerimeter());

        Rectangle r = new Rectangle(new Point(0, 0), 3, 4);
        System.out.println(r);
        System.out.println("Area: " + r.calArea());
        System.out.println("Perimeter: " + r.calPerimeter());
        r.outputPoints();
    }
}

输出结果如下：

Circle with center at (0, 0) and radius 5.0
Area: 78.53981633974483
Perimeter: 31.41592653589793
Rectangle with left point at (0, 0), length 3, and width 4
Area: 12.0
Perimeter: 14.0
Top left point: (0, 0)
Top right point: (3, 0)
Bottom left point: (0, 4)
Bottom right point: (3, 4)