JAVA CONCEPTS

Important Java Mcq 1

Which of the following is true about Java?

a. Java is object-oriented and interpreted.

b. Java is efficient and faster than C++.

c. Java is the choice of everyone.

d. Java is not robust.

Answer:

a. Java is object-oriented and interpreted.

Explanation

Java is an object-oriented programming language, which makes use of various classes and objects. Object-oriented languages provide many features like inheritance, polymorphism, classes, objects, etc. Java can be considered an interpreted language because its source code is first compiled into a binary byte code. This byte code runs on the Java Virtual Machine (JVM), which is usually a software-based interpreter.

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