个人原创代码：Point2D和Point3D作图。编写Java Application程序，分别编写两个类Point2D，Point3D来表示二维空间和三维空间的点，使之满足下列要求：

(1) Point2D有两个整型成员变量x, y (分别为二维空间的X,Y方向坐标)，Point2D的构造方法要实现对其成员变量x, y的初始化。

(2)Point2D有一个void型成员方法offset(int a, int b)，它可以实现Point2D的平移。

(3)Point3D是Point2D的直接子类，它有有三个整型成员变量x,y,z (分别为三维空间的X,Y,Z方向坐标)，Point3D有两个构造方法：Point3D(int x,int y,int z)和Point3D(Point2D p,int z)，两者均可实现对Point3D的成员变量x, y,z的初始化。

(4)Point3D有一个void型成员方法offset(int a, int b,int c)，该方法可以实现Point3D的平移。

(5)在Point3D中的主函数main()中实例化两个Point2D的对象p2d1，p2d2，打印出它们之间的距离，再实例化两个Point2D的对象p3d1，p3d2，打印出他们之间的距离。-Personal original code: Point2D and Point3D mapping. Write a java application program, namely the preparation of two classes Point2D, the Point3D to the point of the two-dimensional space and three-dimensional space, to meet the following requirements:

(1) Point2D two integer member variables x and y (respectively for the two-dimensional space X, the Y-direction coordinate), the construction method in Point2D to achieve its member variables x, y initialization.

(2) Point2D a void member offset (int a, int b), it can Point2D translational.

(3) the Point3D is a direct subclass of Point2D, it has three integer member variables x, y, and z (respectively, three-dimensional space X, Y, Z direction coordinate), Point3D has two constructors: the Point3D (int x int y, int z) and the Point3D (Point2D p-int z), both of which can Point3D member variable x, y, and z initialization.

(4) the Point3D a void member offset (int a, int b, int c), the method can achieve the Point3D the pan.

(5) the P