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Siva Nookala - 14 Mar 2016
This example shows how to find a rectangle's area and perimeter.

Find Rectangle Area And Perimeter
class FindRectangleArea
{
    public static void main(String arg[])
    {
        Rectangle rect = new Rectangle(10, 5);
        
        System.out.println("Length = " + rect.length);
        System.out.println("Breadth = " + rect.breadth);
        System.out.println("Area = " + rect.getArea());
        System.out.println("Perimeter = " + rect.getPerimeter());
    
    }
}

class Rectangle
{
    double length;
    double breadth;

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

    double getArea()
    {
        return length * breadth;
    }

    double getPerimeter()
    {
        return 2 * (length + breadth);
    }
}
OUTPUT

Length = 10.0
Breadth = 5.0
Area = 50.0
Perimeter = 30.0

DESCRIPTION

Here we have created a Rectangle class with member variables length and breadth. We also have declared a constructor to initialize these variables. The getArea() method returns the area and getPerimeter() returns the perimeter of the rectangle. In the main method of FindRectangleArea, we have created one reference and one object of Rectangle class. The details like breadth, length, area and perimeter are also printed.

THINGS TO TRY
  • Add two more member variables - fencingCost and carpetCost and initialize them using constructor. i.e. passing them as parameters.
  • Add one more method, double getFencingCost(), which returns the getPerimeter() multiplied by the fencingCost
  • Add one more method, double getCarpetCost(), which returns the getArea() multiplied by the carpetCost
  • Add one more method, double getTotalCost(), which returns the sum of getFencingCost() and getCarpetCost()
  • Change the main method in FindRectangleArea, to print all the above costs

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