JAVA CONCEPTS

Important Java Mcq 1

The process of recognizing and focusing on the important characteristics of a situation or an object is known as

a. Encapsulation

b. Abstraction

c. Polymorphism

d. Inheritance

Answer:

b. Abstraction

Explanation

The insulation of data from direct access by the program is called the data abstraction. Data abstraction also called data hiding, is the mechanism where the code and the data it manipulates are wrapped into a single unit.

Which keyword is used to import a package from the Java API library?

a) lib b) package c) getlib d) import Answer d) import

Which of the following is not a valid interface?

a. ResultSet b. DriverManager c. Statement d. Connection Answer: b. DriverManager Explanation: DriverManager is a class that acts as an interface between users and Drivers. It

All subclasses are a subtype in object-oriented programming.

a) True b) False Answer b) False Explanation: A subtype is something that is substituted for and behaves as its parent type. All subclass may

Which statement is true for object code?

i) It is used as its fundamental building block ii) Similar objects are classified using a concept of class iii) Polymorphism and abstraction are not