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 Java Questions

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Q:

If you are using C language to implement the heterogeneous linked list, what pointer type will you use?

Answer

The heterogeneous linked list contains different data types in its nodes and we need a link, pointer to connect them. It is not possible to use ordinary pointers for this. So we go for void pointer. Void pointer is capable of storing pointer to any type as it is a generic pointer type.

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Q:

Which method names follow the JavaBeans standard?

A) addSize B) putDimensions
C) getCust D) deleteRep
 
Answer & Explanation Answer: C) getCust

Explanation:

C use the valid prefixes 'get' and 'is

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Q:

Should a main() method be compulsorily declared in all java classes?

Answer No not required. main() method should be defined only if the source class is a java application.
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Subject: Java

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Q:

I want to print "Hello" even before main() is executed. How will you acheive that?

Answer Print the statement inside a static block of code. Static blocks get executed when the class gets loaded into the memory and even before the creation of an object. Hence it will be executed before the main() method. And it will be executed only once.
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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:

What are the restriction imposed on a static method or a static block of code?

Answer A static method should not refer to instance variables without creating an instance and cannot use "this" operator to refer the instance.
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Q:

Which of the following are incorrect form of StringBuffer class constructor  ?

A) StringBuffer(int size , String str) B) StringBuffer(int size)
C) StringBuffer(String str) D) StringBuffer()
 
Answer & Explanation Answer: A) StringBuffer(int size , String str)

Explanation:
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Q:

Which two method you need to implement for key Object in HashMap ?

Answer

In order to use any object as Key in HashMap, it must implements equals and hashcode method in Java.

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Subject: Java
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