Answer to Question #188616 in Java | JSP | JSF for Abdul Hadi

Question

Q.No.2. Design an abstract class GeometricObject with lineColor as data member. GeometricObject must ensure that its children implement calcArea() method.  [Marks : 03]

 

Design RectangleYourRegNo and CircleYourName Classes as children of GeometricObject class with overridden toString() method to return “Rectangle with w Width and h Height is drawn” OR “Circle with r Radius is drawn”. The attributes of Rectangle are length, width. The attribute of Circle is          radius

Hint: Area of circle=πr2 , Area of rectangle= width*length

Answer 1

public class TestYourName {
	static abstract class GeometricObject {
		protected String lineColor;


		public GeometricObject() {
			this.lineColor = "black";
		}
		public GeometricObject(String lineColor) {
			this.lineColor = lineColor;
		}
		public abstract float calcArea();
	}
	
	static class CircleYourName extends GeometricObject {
	    private int radius;


	    public CircleYourName (int radius) {
	        this.radius = radius;
	    }


	    public CircleYourName(int radius, String lineColor) {
	        super(lineColor);
	        this.radius = radius;
	    }


	    @Override
	    public float calcArea() {
	        return (float) (Math.PI * radius * radius);
	    }


	    @Override
	    public String toString() {
	        return "Circle with " + radius + " radius is drawn";
	    }
	}
	
	static class RectangleYourRegNo extends GeometricObject {
	    private int length;
	    private int width;


	    public RectangleYourRegNo (int length, int width) {
	        this.length = length;
	        this.width = width;
	    }


	    public RectangleYourRegNo(int length, int width, String lineColor) {
	        super(lineColor);
	        this.length = length;
	        this.width = width;
	    }


	    @Override
	    public float calcArea() {
	        return width * length;
	    }


	    @Override
	    public String toString() {
	        return "Rectangle with " + width + " width and " + length + " height is drawn";
	    }
	}


	/**
	 * The start point of the program
	 * 
	 * @param args
	 */
	public static void main(String[] args) {
		CircleYourName circleYourName=new CircleYourName(5);
		System.out.println(circleYourName.toString());
		System.out.println("Area: "+circleYourName.calcArea());
		CircleYourName circleYourName1=new CircleYourName(8,"Red");
		System.out.println(circleYourName1.toString());
		System.out.println("Area: "+circleYourName1.calcArea());
		
		RectangleYourRegNo RectangleYourRegNo=new RectangleYourRegNo(3,9);
		System.out.println(RectangleYourRegNo.toString());
		System.out.println("Area: "+RectangleYourRegNo.calcArea());
		RectangleYourRegNo RectangleYourRegNo1=new RectangleYourRegNo(8,5,"Blue");
		System.out.println(RectangleYourRegNo1.toString());
		System.out.println("Area: "+RectangleYourRegNo1.calcArea());
	}


}