Question

Q2) Interface Create a program that calculates the perimeter and the area of any given 2D shape. The program should dynamically assign the appropriate calculation for the given shape. The type of shapes are the following: • Quadrilateral 0 Square . Perimeter: 4xL • Area:LXL O Rectangle • Perimeter: 2(L+W) • Area:LxW Circle Circumference: I x Diameter (TT = 3.14) Area: (TT xD')/4 Triangle (assume right triangle) o Perimeter: a+b+c O Area: 0.5 x base x height (hint: the base and height are the shorter sides) Provide an interface called Shape 2D that contains the common methods and any constant. Then create the classes Quadrilateral, Circle and Triangle that implement interface Shape2D. Class Quadrilateral should be an abstract class and classes Square and Rectangle will extend the abstract class Quadrilateral. For each concrete class, create a toString() method that returns the string representation of each shape's measurements. Create a test file (driver class) called TestShape2D. In the test file, create an object of each 2D shape (1.e., square, rectangle, circle and triangle) and display their information using the implicit toString() call. Use hard code for testing, Test creating objects of Interface type and of the same object type. Example Execution (user input in green) Rectangle: 1-4, W-3, Perimeter - 14.0, Area - 12.0 Square: 1-5, Perimeter - 20.0, Area - 25.0 Circle: D - 5, P - 15.70, A - 19.625 Triangle: a -4, b - 2, C-3, Perimeter - 9.0, Area - 3.0

Answer 1

package area;

import java.text.DecimalFormat;

public class TestShape2D {

   public static void main(String[] args) {
       Shape2D s=new Rectangle(4,3);
       s.area();
       s.perimeter();
       System.out.println(s);
       s=new Square(5);
       s.area();
       s.perimeter();
       System.out.println(s);
       s=new Circle(5);
       s.area();
       s.perimeter();
       System.out.println(s);
       s=new Tringle(4,2,3);
       s.area();
       s.perimeter();
       System.out.println(s);

   }

}
interface Shape2D{
  
   public double area();
   public double perimeter();
}
abstract class Quardilatral implements Shape2D{
   double area;
   double perimeter;
   Quardilatral(double a,double p){
       this.area=a;
       this.perimeter=p;
   }
   Quardilatral(){
      
   }
   abstract public double area();
   abstract public double perimeter();
      
  
}
class Circle implements Shape2D{
   double r;
   double area;
   double perimeter;
   Circle(double r){
       this.r=r;
   }
   public String toString(){
       return "Circle: D="+r+",P="+perimeter+",A="+area;
   }
   @Override
   public double area() {
       DecimalFormat df = new DecimalFormat("####0.00");
       area=(3.14*r*r)/4;
       area=Double.parseDouble(df.format(area));
       return area;
      
   }
   @Override
   public double perimeter() {
       DecimalFormat df = new DecimalFormat("####0.00");
       perimeter=3.14*r;
       perimeter=Double.parseDouble(df.format(perimeter));
       return perimeter;
      
   }
}
class Tringle implements Shape2D{
   double area;
   double perimeter;
   double a;
   double b;double c;
   Tringle(double a,double b,double c){
       this.a=a;
       this.b=b;
       this.c=c;
   }
   public String toString(){
       return "Tringle: a="+a+",b="+b+",c="+c+",Perimeter="+perimeter+",Area="+area;
   }

   @Override
   public double area() {
       //to find base and height
       double shotest=Math.min(Math.min(a, b), Math.min(b, c)); //min of all three
       double secShortest=0; //second min
       if(a==shotest){
           secShortest=Math.min(b, c);
       }
       else if(b==shotest){
           secShortest=Math.min(a, c);
       }
       else if(c==shotest){
           secShortest=Math.min(a, b);
       }
       DecimalFormat df = new DecimalFormat("####0.00");
       area=0.5*shotest*secShortest;
       area=Double.parseDouble(df.format(area));
       return area;
  
   }

   @Override
   public double perimeter() {
       DecimalFormat df = new DecimalFormat("####0.00");
       perimeter=a+b+c;
       perimeter=Double.parseDouble(df.format(perimeter));

       return perimeter;
   }
  

}
class Rectangle extends Quardilatral{

   Rectangle(double l,double b){
       this.l=l;
       this.b=b;
   }
   double l,b;
   @Override
   public double area() {
       DecimalFormat df = new DecimalFormat("####0.00");

       area=l*b;
       area=Double.parseDouble(df.format(area));
       return area;
      
   }

   @Override
   public double perimeter() {
       DecimalFormat df = new DecimalFormat("####0.00");
       perimeter=2*(l+b);
       perimeter=Double.parseDouble(df.format(perimeter));
       return perimeter;
      
   }
   public String toString(){
       return "Rectangle: l="+l+",b="+l+",Perimeter="+perimeter+",Area="+area;
   }
  
}
class Square extends Quardilatral{

   double l;
   Square(double l){
       this.l=l;
   }
   @Override
   public double area() {
       DecimalFormat df = new DecimalFormat("####0.00");
       area=l*l;
       area=Double.parseDouble(df.format(area));
       return area;
   }

   @Override
   public double perimeter() {
       DecimalFormat df = new DecimalFormat("####0.00");
       perimeter=4*l;
       perimeter=Double.parseDouble(df.format(perimeter));

       return perimeter;
   }
   public String toString(){
       return "Square: l="+l+",Perimeter="+perimeter+",Area="+area;
   }
  
}

output

Rectangle: l=4.0,b=4.0,Perimeter=14.0,Area=12.0
Square: l=5.0,Perimeter=20.0,Area=25.0
Circle: D=5.0,P=15.7,A=19.62
Tringle: a=4.0,b=2.0,c=3.0,Perimeter=9.0,Area=3.0