Question

Design of the Box Class. Objects of this class will represent a box (such as a cardboard box.) The sides of a box are rectangles. A Box will have three essential characteristics: width, height, and length. From these characteristics other values may be calculated: volume and total surface area.

Complete the Constructors. The constructors will initialize the instance variables of the object being constructed. You need to pass three parameters to initialize the three instance variables.

Complete a Method. The documentation for the volume( ) method says it looks like this:

// calculate the volume of the box  double  volume()  

The formula to use is: volume = product of all three sides

class Box
{
// Instance Variables
double length ;
double width ;
double height ;

// Constructors
  

// Methods
  

}

Answer 1

CODE:

class Box {
   // Instance Variables
   double length;
   double width;
   double height;

   // Constructors
   //default constructor
   public Box(){}

   //parametrized constructor
   public Box(double length, double width, double height) {
       this.length = length;
       this.width = width;
       this.height = height;
   }
   // Methods
   // method to calculate volume of the box
   public double getVolume(){
       return (length * width * height);
   }

   //method to calculate surface area of the box
   public double getSurfaceArea(){
       double surfaceArea;
       surfaceArea = 2 * + ((length * width) + (width * height) + (height * length));
       return surfaceArea;
   }
}
//Driver class
public class BoxDemo {
   //main method
   public static void main(String[] args) {
       //creating an instance of the Box class
       //by passing the length, width and height
       Box box = new Box(14, 12, 13.2);

       //calling the method to get and display the volume of the box
       System.out.println("The volume of the box is : " + box.getVolume());
       //calling the method to get and display the surface area of the box
       System.out.println("The surface area of the box is : " + box.getSurfaceArea());
   }
}

OUTPUT: