Question

In Java please

10.9 Lab 6

In BlueJ, create a project called Lab6

• Create a class called LineSegment –Note: test changes as you go
• Copy the code for LineSegment given below into the class.
• Take a few minutes to understand what the class does. Besides the mutators and accessors, it has a method called print, that prints the end points of the line segment in the form: (x, y) to (x, y)
• You will have to write two methods in the LineSegment class. There is information on black board under this week to help with the following methods.
  • determineQuadrant - this method determines if the line segment is completely in a quadrant and returns a String (“Quadrant 1”, “Quadrant 2”, “Quadrant 3”, or “Quadrant 4”) representing the quadrant. If it is not completely in a quadrant it returns the string “Crosses an Axis”. There are no formal parameters.
  • computeLength– returns the length of the line segment created by the points. There are no formal parameters
• • Test the line segment class to make sure the methods you added work correctly.

Code for class LineSegment

public class LineSegment
{
    private int x1;
    private int y1;
    private int x2;
    private int y2;

    public LineSegment()
    {
    }
    public LineSegment(int x1, int y1, int x2, int y2)
    {
        this.x1 = x1;
        this.y1 = y1;
        this.x2 = x2;
        this.y2 = y2;

    }
    public void setPoint1(int x, int y)
    {
        this.x1 = x;
        this.y1 = y;
    }
    public void setPoint2(int x, int y)
    {
        this.x2 = x;
        this.y2 = y;
    } 
    public int getPoint1X()
    {
        return x1;
    }
    public int getPoint1Y()
    {
        return y1;
    }
    public int getPoint2X()
    {
        return x2;
    }
    public int getPoint2Y()
    {
        return y2;
    }        
    //Prints the point in the format (x1, y1) to (x2, y2)
    public void print()
    {
        System.out.print("(" + x1 + ", " + y1 + ") to (" + x2 + ", " + y2 + ")");
    }
}    

Once you have the class working

• Create a class called Main – copy the code below into the class
• Follow the comments to write the main method and the enterLineSegmentEndPoints in the Main class.
• The program, when finished, should create the output given
• When you have it running correctly, upload the LineSegment and Main class to zybook and submit it for grading.

Code for class Main

import java.util.Scanner;
public class Main
{
    public static Scanner kb = new Scanner(System.in);

    public static void main(String [] args)
    {
        String input; // this variable used to allow the 
                      // use to type Y or N when asked about
                      // changing point 
        // As you develop your program, add any variables
        // you may need here 



        // Declare an object of the Line Segment class
        // Use the constructor with no formal parameters 



        // You are to finish the rest of main to create the output given. 
        // This program will also have a method called enterLineSegmentEndPoints
        // that allows the user to enter the end points of a line segment. The header
        // for the method is given below main.
        // Declare any variables you may need in the section above
        // Some suggestions might be:
        // First get the loop going that will continue asking if there is
        // another line segment until the user types in anything other than Y
        // Next get the method to enter the endpoints working - see output for formatting
        // Then compute the length of the line segment using the method you wrote in the class
        // Next for the quadrant, you might want to store the string returned from the method 
        // class and then check the first character to determine what to print
        // Finally put in the code that will print the total number of line segments
        // entered after the user indicates they are done.

        // NOTE: Get little pieces to work at a time - do NOT type it all in at once











     }

     // Add the code to this method wrapper so that it allows the user to enter the 
     // end points of the line segments as shown on the output
     public static void enterLineSegmentEndPoints(LineSegment line)
     {

     }

}

A sample output is given

Enter the x and y coordinate of the first end point: 2 9
Enter the x and y coordinate of the second end point: 14 6

Line Segment: (2, 9) to (14, 6)
The length of the line segment is: 12.37
The line segment is completely in Quadrant 1

Would you like to enter another line segment (y/n): Y

Enter the x and y coordinate of the first end point: -4 8
Enter the x and y coordinate of the second end point: -7 -3

Line Segment: (-4, 8) to (-7, -3)
The length of the line segment is: 11.40
The line segment Crosses an Axis

Would you like to enter another line segment (y/n): y

Enter the x and y coordinate of the first end point: 3 -7
Enter the x and y coordinate of the second end point: 21 -14

Line Segment: (3, -7) to (21, -14)
The length of the line segment is: 19.31
The line segment is completely in Quadrant 4

Would you like to enter another line segment (y/n): n

You entered a total of 3 line segments

Answer 1

Main.java
-------------------------------------------------------
import java.util.Scanner;
public class Main
{
    public static Scanner kb = new Scanner(System.in);

    public static void main(String [] args)
    {
        // count variable will keep track of how many times user entered ending points
        int count =1;
        // input takes either yes or no
        String input;

        while(true) {
            LineSegment a = new LineSegment();
            enterLineSegmentEndPoints(a);

            a.print();
            a.lengthOfLine();
            a.findQuadrant();
            System.out.print("Would you like to enter another line segment (y/n): ");
             input = kb.nextLine().toLowerCase();

            if(!input.equals("y")) {
                System.out.println("You entered a total of "+ count+" line segments");
                break;
            }
            count++;
        } // END of While LOOP
    } // END of MAIN

    // Add the code to this method wrapper so that it allows the user to enter the
    // end points of the line segments as shown on the output
    public static void enterLineSegmentEndPoints(LineSegment line)
    {
        System.out.print("Enter the x and y coordinate of the first end point: ");
        String str = kb.nextLine();
        // splits the input ( with spaces in between )
        String[] input = str.split(" ");
        line.setPoint1(Integer.parseInt(input[0]) , Integer.parseInt(input[1]));

        System.out.print("Enter the x and y coordinate of the second end point: ");
        str = kb.nextLine();
        input = str.split(" ");
        line.setPoint2(Integer.parseInt(input[0]) , Integer.parseInt(input[1]));
    } // END of enterLineSegmentEndPoints method.
}// END of MAIN class

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------

LineSegment.java
------------------------------------------
import java.lang.Math;
public class LineSegment
{
    private int x1;
    private int y1;
    private int x2;
    private int y2;

    //  constructor
    public LineSegment()
    {
    }
    // parameterized constructor
    public LineSegment(int x1, int y1, int x2, int y2)
    {
        this.x1 = x1;
        this.y1 = y1;
        this.x2 = x2;
        this.y2 = y2;
    }
    //setters
    public void setPoint1(int x, int y)
    {
        this.x1 = x;
        this.y1 = y;
    }
    public void setPoint2(int x, int y)
    {
        this.x2 = x;
        this.y2 = y;
    }
    // getters
    public int getPoint1X()
    {
        return x1;
    }
    public int getPoint1Y()
    {
        return y1;
    }
    public int getPoint2X()
    {
        return x2;
    }
    public int getPoint2Y()
    {
        return y2;
    }

    //Prints the point in the format (x1, y1) to (x2, y2)
    public void print()
    {
        System.out.print("Line Segment: "+"(" + x1 + ", " + y1 + ") to (" + x2 + ", " + y2 + ")\n");
    }

    public void lengthOfLine() {
        int x1 = this.getPoint1X();
        int y1 = this.getPoint1Y();

        int x2 = this.getPoint2X();
        int y2 = this.getPoint2Y();

        // sqrt[ (x2 - x1)^2 + (y2-y1)^2 ]
        float length = (float)Math.sqrt(Math.abs(x2-x1)*Math.abs(x2-x1)  + Math.abs(y2-y1)*Math.abs(y2-y1));
        System.out.printf("The length of the line segment is: %.2f\n",(length));
    }

    // This method helps us to find in which quadrant the line segment lies.
    // if it lies in more than one quadrant ,it prints crosses an Axis 
    public void  findQuadrant() {
        int x1 = this.getPoint1X();
        int y1 = this.getPoint1Y();
        int quad1 = quadHelper(x1,y1);

        int x2 = this.getPoint2X();
        int y2 = this.getPoint2Y();
        int quad2 = quadHelper(x2,y2);

        if(quad1 == quad2) {
            System.out.println("The line segment is completely in Quadrant "+quad1);
        }
        else {
            System.out.println("The line segment Crosses an Axis");
        }
    }

    // this takes a point (x,y) values
    // and decides in which quadrant the point lies
    public int quadHelper(int x, int y) {

        // if x is +ve and y is +ve , point is in quadrant 1.
        if( x >0 && y >0 ) {
            return 1;
        }
        else if( x>0 && y<0 ) {
            return 4;
        }
        else if(x <0 && y>0) {
            return 2;
        }
        else  {
            return 3;
        }
    }

}  // END OF LineSegment class

============================================================

OUTPUT:

THANK YOU!! If you have any doubt , please ask in comment section .. i will definitely clarify.