JAVA CONCEPTS

Important Java Mcq 1

In java declaring a class abstract is useful

a. To prevent developers from further extending the class.

b. When default implementations of some methods are not desirable.

c. When it doesn’t make sense to have objects of that class.

d. When it makes sense to have objects of that class.

Answer:

c. When it doesn’t make sense to have objects of that class.

Explanation:

Remaining other choices are opposite to the meaning of abstract class.
Abstract class and methods allow the other classes to achieve the functionality of multiple
inheritance in java.

Which of the following is a white label error?

a. Springboot error b. Custom error c. Both a and b d. None of the above Answer: a. Springboot error Explanation: The Java Naming and

using BorderLayout you can place components along?

a. ClassesOnly north b. Only south c. Only east d. Only west e. North, south, east, west, and center Answer: e. North, south, east, west,

You read the following statement in a Java program that compiles and executes submarine.dive(depth); What can you say for sure?

a. Depth must be an int. b. Dive must be a method. c. Dive must be the name of an instance field. d. Submarine must

multiple inheritance means?

a. one class inheriting from more superclasses b. more classes inheriting from more superclasses c. more classes inheriting from one superclass d. None of the