Create a new class called Quadrilateral that extends Shape and implement the fol

Q: Create a new class called Quadrilateral that extends Shape and implement the fol

Quadrilateral Class import java.awt.Point; public class Quadrilateral extends Shape{ private Point[] points; protected Quadrilateral(Point[] aPoints) { super("Quadrilateral"); for(int i=0;i

ID: 3843247 • Letter: C

Question

Create a new class called Quadrilateral that extends Shape and implement the following constructor.

• protected Quadrilateral(Point[] aPoints)

This constructor calls the superclass’s constructor and passes it the name "Quadrilateral". It then passes a copy of the first four entries in the aPoints array to the setPoints method.

Override the following methods.

1. public double getPerimeter()

This method calculates the perimeter of the Quadrilateral. The perimeter of a quadrilateral is the sum of the lengths its sides (to get the length of a side, calculate the distance between the two of its vertices).

2. public double getArea()

This method calculates the area of the Quadrilateral. If the vertices of a quadrilateral are A = (ax,ay), B = (bx,by), C = (cx,cy), and D = (dx,dy), then the area of the quadrilateral is given by the expression

[(axby aybx)+(bxcy bycx)+(cxdy cydx)+(dxay dyax)] / 2

Here is my code for shape

import java.awt.Point;

public abstract class Shape {

private String name;

private Point[] points;

protected Shape(String aName) {

this.name = aName;

}

public final String getName() {

return this.name;

}

protected final void setPoints(Point[] thePoints) {

this.points = thePoints;

}

public final Point[] getPoints() {

return this.points;

}

public static double getDistance(Point p1, Point p2) {

double x1 = p1.getX();

double x2 = p2.getX();

double y1 = p1.getY();

double y2 = p2.getY();

double add1 = x1 - x2;

double sqr1 = add1 * add1;

double add2 = y1 - y2;

double sqr2 = add2 * add2;

double sqrt = sqr2 + sqr1;

return Math.sqrt(sqrt);

}

abstract double getPerimeter();// Just Remove Method body

}

Explanation / Answer

Quadrilateral Class

import java.awt.Point;

public class Quadrilateral extends Shape{

   private Point[] points;
   protected Quadrilateral(Point[] aPoints)
   {

       super("Quadrilateral");
       for(int i=0;i<4;i++)
       {
           points[i]=aPoints[i];
       }
       this.setPoints(points);
   }

   @Override
   double getPerimeter() {
       double perimeter=0;
       Point[] points=this.getPoints();
       perimeter+=getDistance(points[0],points[1]);
       perimeter+=getDistance(points[1],points[2]);
       perimeter+=getDistance(points[2],points[3]);
       perimeter+=getDistance(points[3],points[0]);
       return perimeter;
   }
   public double getArea()
   {
       Point[] points=this.getPoints();
       double area=0;
       Point A=points[0];
       Point B=points[1];
       Point C=points[2];
       Point D=points[3];
       area=((A.getX()*B.getY()-A.getY()*B.getX())+(B.getX()*C.getY()-B.getY()*C.getX())+(C.getX()*D.getY()-C.getY()*D.getX())+(D.getX()*A.getY()-D.getY()*A.getX()))/2;
       return area;
   }
}

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