1、 Programming a class of points on a two-dimensional plane Point, And write test classes Point Class , draw Point Class UML Class diagram .

Point Class contains the following member variables and methods ：

（1） Two private double A member variable of type x、y, Denote points respectively x and y coordinate ;

（2） A construction method without parameters ;

（3） One for x、y A parametric construction method for setting the initial value of coordinates ;

（4） One movePoint（int dx, int dy） Method to move the position of the point ,dx,dy Respectively represent the points in the coordinates x Direction and y Displacement in direction ;

（5） One public String toString() Method returns the coordinate position information of the point .

Test requirements ：

（1） Use the parameterless construction method to create a Point object p1;

（2） Use the parametric construction method to create a Point object p2, Enter the point from the keyboard x、y coordinate ;

（3） call movePoint（） Method makes p2 stay x Direction and y Move in all directions 2 A unit of ;

（4） Refer to the example , Output the coordinate positions of two points respectively .