编写一个线段类 MyLine，要求如下:

主要属性有: e1，e2 端点，类型为Point

编写构造方法，如（Point p1 , Point p2）

编写成员方法。如：

检查线段是否位于第一象限check…

求线段的长度 length() …

判断两条线段（非延长线）是否相交(另一线段作为参数）。

求一点到该线段（或延长线）的距离

编写测试程序

用户输入线段的两点坐标构造一个线段

用户选择需要执行已编写的哪种方法（判断是否相交）

根据用户选择的方法要求用户输入点的坐标，或者线段的两点坐标，并反馈给用户结果。

-Write a line class MyLine requirements are as follows:

The main attributes are: e1, e2 endpoint of type Point

Write the constructor method, such as (Point p1 is, Point p2)

Write the member method. Such as:

Check the line is in the first quadrant of the check ...

Length and segment length () ...

Judge two segments (non-extension cable) whether the intersection (another segment as a parameter).

Request to point to the distance of the line (or extension cord)

The preparation of test procedures

The user to enter segments coordinate to construct a line segment

User to select which method need to execute a written (to judge whether the intersection)

According to the user to select the method requires the user to enter the coordinates of the point or segment two coordinates, and feedback to the user results.