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 Java Questions

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Q:

In RDBMS, what is the efficient data structure used in the internal storage representation?

A) Stack B) Queue
C) B+ tree structure D) AVL tree Structure
 
Answer & Explanation Answer: C) B+ tree structure

Explanation:

B+ tree. Because in B+ tree, all the data is stored only in leaf nodes, that makes searching easier. This corresponds to the records that shall be stored in leaf nodes

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Q:

Which of these class have only one field 'TYPE' ?

A) Run time B) Process
C) Void D) System
 
Answer & Explanation Answer: C) Void

Explanation:

The Void class has one field, TYPE, which holds a reference to the Class object for the type void.

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Q:

I don't want my class to be inherited by any other class. What should i do?

Answer

You should declared your class as final. But you can't define your class as final, if it is an abstract class. A class declared as final can't be extended by any other class.

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Q:

Which containers use a border Layout as their default layout ?

Answer

The window, Frame and Dialog classes use a border layout as their default layout.

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Q:

What is the access scope of a protected method?

Answer A protected method can be accessed by the classes within the same package or by the subclasses of the class in any package.
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Q:

What is the importance of finally block in exception handling ?

Answer

A finally block will always be executed, whether or not an exception is actually thrown. Even in the case where the catch statement is missing and an exception is thrown, the finally block will still be executed. Last thing to mention is that the finally block is used to release resources like I/O buffers, database connections, etc.

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Q:

What’s the difference between Enumeration and Iterator interfaces ?

Answer

Enumeration is twice as fast as compared to an Iterator and uses very less memory. However, the Iterator is much safer compared to Enumeration, because other threads are not able to modify the collection object that is currently traversed by the iterator. Also, Iteratorsallow the caller to remove elements from the underlying collection, something which is not possible with Enumerations.

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Q:

How many constructors can a class have?

A) 1 B) 2
C) 4 D) None of the above
 
Answer & Explanation Answer: D) None of the above

Explanation:

A class can have any number of constructors. If a class have more than one constructor, we call it as the constructor is overloaded.

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