)Open/Closed Principle(OCP)

Software entities should be open for extension but closed for modification. This allows adding new function without altering existing code.

class AreaCalculator

{

public double calculateArea(String shape,double radius,double length,double breadth)

{

if(shape.equals(“circle”))

{

return Math.PI*radius*radius;

}

else if(shape.equals(“rectangle”))

{

return length*breadth;

}

}

class OCPviolation

{

public static void main(String args[])

{

AreaCalculator c=new AreaCalculator();

System.out.println(“Circle Area=” +c.calculateArea(“circle”,5,6,7);

}

}