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Abstract Class And Methods >
Siva Nookala - 03 Mar 2017
In this program we will create an array of Shapes and find the shape with largest area and print its details.

Find Shape With Largest Area
class FindShapeWithLargestArea
{
    public static void main(String arg[])
    {
        Shape shapes[] = new Shape[5];
        
        shapes[0] = new Rectangle(30.3, 45.4);
        shapes[1] = new Circle(23.2);
        shapes[2] = new Triangle(146.2, 40.0);
        shapes[3] = new Rectangle(25, 57.8);
        shapes[4] = new Triangle(120.0, 8.0);
        
        
        Shape largest = shapes[0];
        
        for(int i = 0; i < shapes.length; i++)
        {
            if(shapes[i].getArea() > largest.getArea())
            {
                largest = shapes[i];
            }
        }
        
        System.out.println("The details of the shape with largest area are :" );
        
        largest.printDetails();    
    }
}

abstract class Shape
{
    abstract double getArea();

    abstract void printDetails();
}

class Rectangle extends Shape
{
    double length;
    double breadth;

    Rectangle(double length, double breadth)
    {
        this.length = length;
        this.breadth = breadth;
    }

    double getArea()
    {
        return length * breadth;
    }

    void printDetails()
    {
        System.out.println("Type = Rectangle");
        System.out.println("Length = " + length);
        System.out.println("Breadth = " + breadth);
        System.out.println("Area = " + getArea());
    }
}

class Circle extends Shape
{
    double radius;

    Circle(double radius)
    {
        this.radius = radius;
    }

    double getArea()
    {
        return 3.14 * radius * radius;
    }

    void printDetails()
    {
        System.out.println("Type = Circle");
        System.out.println("Radius = " + radius);
        System.out.println("Area = " + getArea());
    }
}

class Triangle extends Shape
{
    double base;
    double height;

    Triangle(double base, double height)
    {
        this.base = base;
        this.height = height;
    }

    double getArea()
    {
        return base * height / 2.0;
    }

    void printDetails()
    {
        System.out.println("Type = Triangle");
        System.out.println("Base = " + base);
        System.out.println("Height = " + height);
        System.out.println("Area = " + getArea());
    }
}
OUTPUT

The details of the shape with largest area are :
Type = Triangle
Base = 146.2
Height = 40.0
Area = 2924.0

DESCRIPTION

Here we declared an abstract Shape class and 3 concrete sub-classes Rectangle, Circle and Triangle. In the main method we have created an array of Shapes and we have created objects of Rectangle, Circle and Triangle and initialized that array. We can do this since every sub-class object is also a super class object.
Later, we have a written a for loop to identify the shape with largest area and print its details.

THINGS TO TRY
  • Change the program to find the Shape with smallest area and print it.
  • Add one more abstract method getPerimeter() in the Shape class and implement that method in sub-classes Rectangle, Circle and Triangle. Change the main method to print the Shape with largest perimeter.

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Score more than 2 points

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