Create a class named Rectangle that has instance variables height and width. Pro

Question

Create a class named Rectangle that has instance variables height and width. Provide a constructor that initializes the instance variables based on parameter values, getter and setter methods for the instance variables, a to String method, and a method named computeSurfaceArea(), that returns the surface area of the rectangle. Create a child class named RectPrism that contains an additional instance variable named depth. Provide a constructor, getter and setter methods for the new instance variable, and a method named computeVolume(), that returns the volume of the rectangular prism. Override the toString() and the computeSurfaceArea() methods. Write an application called Demo, that instantiates a rectangle and a rectangular prism, and tests all the methods.

Explanation / Answer

Demo.java

import java.util.Scanner;

public class Demo {

   public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
       System.out.println("Enter Weight :");
       double weight = scan.nextDouble();
       System.out.println("Enter Height :");
       double height = scan.nextDouble();
       System.out.println("Enter Depth :");
       double depth = scan.nextDouble();
       Rectangle rec = new Rectangle(height, weight);
       System.out.println(rec.toString());
       RectPrism prism = new RectPrism(height, weight, depth);
       System.out.println(prism.toString());
       Rectangle rec1 = new RectPrism(height, weight, depth);
       System.out.println(rec1.toString());

   }

}

Rectangle.java

public class Rectangle {
   private double height;
   private double weight;
   public static int count;
   public Rectangle(double height, double weight) {
       this.height = height;
       this.weight = weight;
       count++;
   }
   public double getHeight() {
       return height;
   }
   public void setHeight(double height) {
       this.height = height;
   }
   public double getWeight() {
       return weight;
   }
   public void setWeight(double weight) {
       this.weight = weight;
   }
   public double computeSurfaceArea() {
       return weight * height;
   }
   public String toString() {
       return "Rectangle Height :"+getHeight()+" Weight : "+getWeight()+" Surface Area : "+computeSurfaceArea();
   }
  
}

RectPrism.java

public class RectPrism extends Rectangle{

   private double depth;
   public static int count;
   public RectPrism(double height, double weight, double depth){
       super(height, weight);
       this.depth = depth;
       count++;
   }
   public double getDepth() {
       return depth;
   }
   public void setDepth(double depth) {
       this.depth = depth;
   }
   public double computeSurfaceArea() {
       return 2 * (getHeight() * getDepth() + getDepth() * getWeight() + getWeight() * getHeight());
   }
   public double computeVolume() {
       return getHeight() * getHeight() * getDepth();
   }
   public String toString() {
       return "RectPrism Height :"+getHeight()+" Weight : "+getWeight()+" Surface Area : "+computeSurfaceArea()+" Volume : "+computeVolume();
   }
}

Output:

Enter Weight :
2
Enter Height :
3
Enter Depth :
4
Rectangle Height :3.0 Weight : 2.0 Surface Area : 6.0
RectPrism Height :3.0 Weight : 2.0 Surface Area : 52.0 Volume : 36.0
RectPrism Height :3.0 Weight : 2.0 Surface Area : 52.0 Volume : 36.0

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