Chapter 8, Problem 17E

Explanation of Solution

Accessor method:

//definition of "Line" class

public class Line

{

    /*create the two objects for the "Point" class*/

    private Point p1;

    private Point p2;

    //definition of "isCollinear" class

    public boolean isCollinear(Point p)

    {

        // check all points have same x or y value

if ((p.getX() == p1.getX() && p.getX() == p2.getX()) || (p.getY() == p1.getY() && p.getY() == p2.getY()))

        {

            //return true

            return true;

        }

/* declare the variables and calculate the values*/

double slope1 = (p1.getY() - p.getY()) / (p1.getX() - p.getX());

double slope2 = (p2.getY() - p.getY()) / (p2.getX() - p...