It is a programming approach that organizes code into object and classes and make it more structured and easy to use. Java Follows DRY (Don’t Repeat Yourself)

• Abstraction
• Encapsulation
• Inheritance
• Polymorphism

Only essential details are displayed to the user In hava it is achieved via Interfaces and Abstract classes

Wrapping up of the data into a single unit data-hiding Variables are private and the methods are public

• Mechanism to inherit the features of some class
• Also known as is-a relationship
• Super class vs Sub class
• Reusability
• Use extends keyword

Ability to differentiate between entities with same name efficiently

• Method overloading / compile time
• Method overriding / runtime