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Q:

What do you mean by late binding?

Answer

Late binding refers to function calls that are not resolved until run time. Virtual functions are used to achieve late binding. When access is via a base pointer or reference, the virtual function actually called is determined by the type of object pointed to by the pointer.

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Subject: C++

Q:

What do you mean by reference variable in c++?

Answer

A reference variable provides an alias to a previously defined variable.
Data -type & reference-name = variable name

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Subject: C++

Q:

What are pass by reference and passby value ?

Answer

Pass By Reference means the passing the address itself rather than passing the value. Passby Value means passing a copy of the value to be passed.

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Subject: Java

Q:

What do you understand by private, protected and public?

Answer

These are accessibility modifiers. Private is the most restrictive, while public is the least restrictive. There is no real difference between protected and the default type (also known as package protected) within the context of the same package, however the protected keyword allows visibility to a derived class in a different package.

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Subject: Java

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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Subject: Java

Q:

What is the difference between creating a thread by extending Thread class and by implementing Runnable interface? Which one should prefer?

Answer

When creating a thread by extending the Thread class, it is not mandatory to override the run method (If we are not overriding the run method , it is useless), because Thread class have already given a default implementation for run method. But if we are implementing Runnable , it is mandatory to override the run method. The preferred way to create a thread is by implementing Runnable interface, because it give loose coupling.

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Subject: Java

Q:

 A report generated by a reporting system is delivered to the appropriate users via a user-accessed Web site. This system uses which of the following report modes?

A) Push B) Pull
C) RFM D) OLAP
 
Answer & Explanation Answer: B) Pull

Explanation:
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Filed Under: Database

Q:

 Which of the following occurs when a transaction rereads data it has previously read and finds modification or deletions caused by a committed transaction?

A) Nonrepeatable read B) Phantom read
C) Dirty read D) Consistent read
 
Answer & Explanation Answer: A) Nonrepeatable read

Explanation:
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Filed Under: Database