JAVA CONCEPTS

Important Java Mcq 1

Which of the following is an implicit object?

a. Vector

b. ln

c. Response

d. Request

Answer:

d. Request

Explanation:

The JSP request is an implicit object of type HttpServletRequest. It can be used to get request information such as parameter, header information, remote address, server name, server port, content type, character encoding.

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