Download or read book Computer Application Sure Success for Class Xth written by Amit Kumar Srivastava and published by Onlinegatha. This book was released on 2016-05-20 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1. Name any two OOP's Principles. a) Abstraction b) Encapsulation, c) Inheritance d) Polymorphism 2. Define Encapsulation. Encapsulation is an Object Oriented Programming concept, that binds together the data and functions that manipulate the data and that keeps it safe both, from the outside interference and misuse. For example: capsule, it is wrapped with different medicines. Therefore, wrapping up of data (i.e. characteristics) and functions (i.e. behavior) into a single unit is known as, Encapsulation. 3. State main features of an Object Oriented Programming language. a) Abstraction b) Encapsulation, c) Inheritance d) Polymorphism 4. What is inheritance and how is it useful in Java? Inheritance in java is a mechanism in which one object acquires all the properties and behaviors of the parent object. The idea behind inheritance in java is that you can create new classes that are built upon the existing classes. When you inherit from an existing class, you can reuse the methods and fields of the parent class and you can add new methods and fields also.