Core Java Interview Questions
Questions Answers Views Company eMail

what are the disadvantages of indexes in oracle?

3i Infotech, Wells Fargo,

1867

How we get some middle records in one table?

3i Infotech,

2 5455

tell me some common

TCS,

2 3574

Which is the best way of exception handling?

Oracle,

2 5932

what is the difference between System.exit() and System.exit(1)?

eClinical Solutions, eClinical Works, eClinicalWorks,

1 6363

Can there be an abstract class with no abstract methods in it?

1 3175

can any one send me the example program of immutable class?

Arfin, TCS,

2 4353

There are 100 keys and values in HashMap.how to get the keys and values?

IBS,

1 5769

what is the diffrences between platform independent and portable

TCS,

5 21441

Java support call by reference (pass by reference) ?

HCL,

1 3838

System.out & System.in are final static data member of System class but we can change there reference through setOut() & setIn() method how...

FCS, TCS,

2 5041

difference between vectorlist and hash

TCS,

1 3555

why HashTable not allow null key and value

Crimson Logic,

2 21306

why string constant pool in java

TCS,

2 7971

why top level class could not be static

L&T,

3 11676


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Un-Answered Questions { Core Java }

Given a singly linked list, how will you print out its contents in the reverse order? Can you do it with consuming any extra space?

609


How do you generate random numbers in java?

522


Explain how to force the garbage collection in java.

539


What is javac used for?

520


What happens when you invoke a thread’s interrupt method while it is sleeping or waiting?

580






Can you call a method on a null object?

569


What does \ mean in regex?

626


What is the differences between heap and stack memory in java? Explain

537


What is a parameter in matrices?

547


Why is it important to initialize a variable?

502


What is the purpose of garbage collection in java, and when is it used?

568


Why can't we override private static methods?

523


What is the difference between the direct buffer and non-direct buffer in java?

547


What is mean by encoding?

633


What is appletviewer?

576