Oops and four pillars, Difference between abstract class and interface, method overloading and overriding.

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Abstract class vs interface, method overloading vs overriding explained with examples.

Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
Abstract class can have constructors, while interface cannot.
Method overloading is having multiple methods in the same class with the same name but different parameters.
Method overriding is implementing a method in a subclass that is already defined in the superclass.
Example: Abstract class - Animal with abstract method 'eat', Interface - Flyable with method 'fly'.
Example: Method overloading - add(int a, int b) and add(int a, int b, int c).
Example: Method overriding - Animal class with 'eat' method overridden in Dog class.

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