Question

Create a BoxFigure class that inherits RectangleFigure class

BoxFigure Class should contain:- Height instance field- Default constructor -- that calls the default super class constructor and sets the default height to 0- Overloaded constructor with three parameters (length, width and height) – that calls the two parameterized super class constructor passing in length and width passed and sets the height to passed height.- setDimension method with three parameters (length, width, height) – call the super class setDimension and pass in length and width passed, if the height is >= 0 set the height to passed height else height should be 0.- getHeight method should return the instance field height- value-returning area method – 2 * (getLenght() * getWidth() + getLength() * height + getWidth() * height)- value-returning volume method – will return super class area * height;- print method – will display Length, Width, Height, Surface Area and Volume

Polymorphism Class should contain:- Create two reference variables (named rec and shapeRef) of RectangleFigure class. - Create one reference variable (called box) of BoxFigure class. - Create object of rec calling parameterize constructor of RactangleFigure class passing in values into the constructor.- Create object of box calling parameterize constructor of BoxFigure class passing in values into the constructor.- Assign rec to shapeRef reference- Display Rectangle, using shapeRef reference name call the print method - Assign box to shapeRef reference- Display Box, using shapeRef reference name call the print method.

public class RectangleFigure_Polymorphism{

private double length;

private double width;

public RectangleFigure_Polymorphism() {

length = 0;

width = 0;

}

public RectangleFigure_Polymorphism(double l, double w) {

setDimension(l, w);

}

public void setDimension(double l, double w) {

if(l >= 0)

length = l;

else

length = 0;

if(w > 0)

width = w;

else

width = 0;

}

public double getLength() {

return length;

}

public double getWidth() {

return width;

} public double area() {

return length * width;

} public double perimeter() {

return 2 * (length + width);

}

public void print() {

System.out.print("Length = " + length+ "; Width = " + width+ "\n"+ "Area = " + area());

}

}//end of class

Answer 1

Hello dear....

Here is the perfectly working java program for the given task.  Also attached image of output and code for comfort of reading. Hope you will like it.

Polymorphism.java

public class Polymorphism{
        public static void main(String[] args) {
                //create reference varibles
                RectangleFigure rec, shapeRef;
                BoxFigure box;
                //create objects of classes
                rec = new RectangleFigure(12.5, 6.0);
                box = new BoxFigure(8.5, 5.0, 6.1);

                shapeRef = rec;
                shapeRef.print();
                shapeRef = box;
                shapeRef.print();

        }
}

public class RectangleFigure{
        private double length;
        private double width;
        public RectangleFigure() {
                length = 0;
                width = 0;
        }
        public RectangleFigure(double l, double w) {
                setDimension(l, w);
        }
        public void setDimension(double l, double w) {
                if(l >= 0)
                        length = l;
                else
                        length = 0;
                if(w > 0)
                        width = w;
                else
                        width = 0;
        }
        public double getLength() {
                return length;
        }
        public double getWidth() {
                return width;
        }
        public double area() {
                return length * width;
        }
        public double perimeter() {
                return 2 * (length + width);
        }
        public void print() {
                System.out.print("\nLength = " + length+ "; Width = " + width+ "\n"+ "Area = " + area());
        }
}//end of class

//BoxFigure class inherits Rectangle class
public class BoxFigure extends RectangleFigure{
        //private variables
        private double height;
        //default constructor
        public BoxFigure(){
                super();
                height = 0;
        }
        //overloaded parameterizes constructor
        public BoxFigure(double l, double w, double h){
                super(l, w);
                if(h >= 0)
                        height = h;
                else
                        height = 0;
        }
        //setDimention method to set length, width, height
        public void setDimension(double l, double w, double h) {
                super.setDimension(l,w);

                if(h >= 0)
                        height = l;
                else
                        height = 0;
        }
        //returns height
        public double getHeight() {
                return height;
        }
        //returns surfaceArea box
        public double surfaceArea() {
                return 2 * ( getLength()*getWidth() + getLength()*height + getWidth()*height );
        }
        //returns volue of box
        public double volume() {
                return area() * height;
        }
        //print method to print information
        public void print() {
                System.out.print("\nLength = " + getLength()+ "; Width = " + getWidth()+ "; Height = " + height+ "\n"+ "Surface Area = " + surfaceArea() + "\n"+ "Volume = " + volume());
        }

}

Output:

= Length 12.5; Width = 6.0 Area 75.0 Length 8.5; Width 5.0; Height = 6.1 Surface Area = 249.7 Volume = 259.25 =

Code Images:

public class Polymorphism{ public static void main(String[] args) { //create reference varibles RectangleFigure rec, shapeRef; BoxFigure box; //create objects of classes rec = new RectangleFigure(12.5, 6.0); box = new BoxFigure(8.5, 5.0, 6.1); shapeRef = rec; shapeRef.print(); shapeRef = box; shapeRef.print(); } } public class RectangleFigure{ private double length; private double width; public RectangleFigure() { length = 0; width = @; } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 public RectangleFigure(double l, double w) { setDimension(1, w); } public void setDimension(double I, double w) { if(1 >= ®) length = 1; else length = 0; if(w > 0) width = w; else width = ®; } public double getLength() { return length; } public double getWidth() { return width; ہا public double area() { return length * width; } public double perimeter() { return 2 * (length + width); }

public void print() { System.out.print("\nLength = " - length+ "; Width = " + width+ "\n"+ "Area = " + area(); } }//end of class 50 51 52 53 54 55 56 57 58 59 60 61 62 63 //BoxFigure class inherits Rectangle class public class BoxFigure extends RectangleFigure{ //private variables private double height; //default constructor public BoxFigure(){ super(); height = 0; } 64 65 66 67 68 69 70 71 72 73 74 75 76 //overloaded parameterizes constructor public BoxFigure(double l, double w, double h) { super(1, w); if(h >= 0) height = h; else height 0; } // setDimention method to set length, width, height public void setDimension(double I, double w, double h) { super.setDimension(1,w); 77 if(h >= 0) height = 1; else height = 0; } 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 //returns height public double getHeight() { return height; } //returns surfaceArea box public double surfaceArea() { return 2 * (getLength() getWidth() = getLength() height + getWidth() height); } //returns volue of box public double volume() { return area() * height; } //print method to print information public void print() { System.out.print("\nLength = " + getLength()+ "; Width = getWidth(): "; Height = " + height+ "\n"+ Surface Area = " + surfaceArea() + "\n"+ "Volume = + volume()); } 96 97 98 99 }

Hope you like it.

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