Write a class called Line that represents a line segment between two Points. Your Line objects should have the following methods:
public Line(Point p1, Point p2)
Constructs a new Line that contains the given two Points.
public Point getP1()
Returns this Line's first endpoint.
public Point getP2()
Returns this Line's second endpoint.
public String toString()
Returns a String representation of this Line, such as "[(22, 3), (4, 7)]".

B) Add the following accessor method to your Line class:
public double getSlope()

Returns the slope of this Line. The slope of a line between points (x1, y1) and (x2, y2) is equal to (y2 – y1) / (x2 – x1). If x2equalsx1 the denominator is zero and the slope is undefined, so you may throw an exception in this case.

C) Add the following constructor to your Line class:
public Line(int x1, int y1, int x2, int y2)

Constructs a new Line that contains the given two Points.

D) Add the following accessor method to your Line class:
public boolean isCollinear(Point p)

Returns true if the given Point is collinear with the Points of this Line —that is, if, when this Line is stretched infinitely, it would eventually hit the given Point