Liskov Substitution Principle

The Liskov Substitution Principle states that:

Child classes should never break the parent class' type definitions.

According to this principle, a subclass should override the parent class's methods in a way that does not break functionality from a client's point of view.

According to this principle, if a class is extending another class, the functionality of the child class should not conflict with that of its parent.

We can demonstrate this with the following example:

public class Rectangle { 
   private double length; 
   private double height; 
 
 
   public void setLength(double length) { 
       this.length = length; 
   } 
 
   public void setHeight(double height) { 
       this.height = height; 
   } 
 
   public double getLength() { 
       return length; 
   } 
 
   @Override 
   public double getHeight() { 
       return...