JAVA CONCEPTS

Important Java Mcq 1

The mechanism of designing a new class based on one or more existing classes is called?

a. Polymorphism

b. Inheritance

c. Abstraction

d. Encapsulation

Answer:

b. Inheritance

Explanation

Inheritance in Java is a mechanism in which one object acquires all the properties and behaviors of a parent object. It is an important part of OOPs (Object Oriented programming systems). The idea behind inheritance in Java is that you can create new classes that are built upon existing classes.

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 statements is incorrect with respect to overriding?

a. When overriding a method, the names and type signatures of the override method must be the same as the virtual method that is being

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

What is the output of the below Java program with constructors?

a) Count=0 b) Count=10 c) Compile error d) None of the above Answer c) Compile error