violation of liskov substitution principle

Shristi Gautam answered on September 9, 2022 Popularity 5/10 Helpfulness 6/10

answer violation of liskov substitution principle

violation of liskov substitution principle

Comment

Square inherits Rectangle and Circle inherits Ellipse

Even though a square is a rectangle, inheriting square from a rectangle violates
LSP.Because in a square, changing one dimension(either height or width)
changes another one as well as both height and width should be equal.

If we create two rectangles
Rectangle r1 = new Rectangle();    and    Rectangle r2 = new Rectangle();
r.height = 5;                             r.height = 4;
r.width = 4                               r.width = 5; 
If we calculate area of both, they are the same.
  
But if we substitute Rectangle() with Square() and calculate the area,
r1 will give 16 and r2 will give 25. 
  
This violates LS as the order in which the width and height are specified has 
become important. An alternative may be creating "Shape" base class or 
interface that is shared by rectangles and squares. 
The base class would not include properties for Height and Width, 
instead allowing the dimensions of different shapes to be handled by 
their implementations.

Popularity 5/10 Helpfulness 6/10 Language java

Source: Grepper

Tags: java liskov-substitution-principle

Link to this answer
Share Copy Link