Program: //definition of "Line" class public class Line { /create the two objects for the "Point" class/ private Point p1; private Point p2; // definition of constructor public Line(Point p1, Point p2) { /set the points to the "Point" class object/ this.p1 = p1; this.p2 = p2; } //definition of "getP1" method public Point getP1() { // returns this line's first endpoint return p1; } //definition of "getP2" method public Point getP2() { // returns this line's second endpoint return p2; } //definition of "toString" method public String toString() { /returns a string representation of this line/ return "[" + p1 + ", " + p2 + "]"; } //definition of "getSlope" method public double getSlope() { //check two points are equal if (p1...

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Chapter 8, Problem 15E

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Program:

//definition of "Line" class

public class Line

{

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

    private Point p1;

    private Point p2;

    // definition of constructor

    public Line(Point p1, Point p2)

    {

        /set the points to the "Point" class object/

        this.p1 = p1;

        this.p2 = p2;

    }

    //definition of "getP1" method

    public Point getP1()

    {

        // returns this line's first endpoint

        return p1;

    }

    //definition of "getP2" method

    public Point getP2()

    {

        // returns this line's second endpoint

        return p2;

    }

    //definition of "toString" method

    public String toString()

    {

/returns a string representation of this line/

        return "[" + p1 + ", " + p2 + "]";

    }

    //definition of "getSlope" method

    public double getSlope()

    {

        //check two points are equal

        if (p1...

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