Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

what are the disadvantages of indexes in oracle?

3i Infotech, Wells Fargo,

2554

How we get some middle records in one table?

3i Infotech,

2 6359

tell me some common

TCS,

2 4509

Which is the best way of exception handling?

Oracle,

2 6964

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

eClinical Solutions, eClinical Works, eClinicalWorks,

1 7203

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

1 3833

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

Arfin, TCS,

2 5297

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

IBS,

1 6494

what is the diffrences between platform independent and portable

TCS,

5 23585

Java support call by reference (pass by reference) ?

HCL,

1 4506

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 6066

difference between vectorlist and hash

TCS,

1 4239

why HashTable not allow null key and value

Crimson Logic,

2 22481

why string constant pool in java

TCS,

2 8975

why top level class could not be static

L&T,

3 13100

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Un-Answered Questions { Core Java }

Difference between vector and arraylist.

1115

how we can make a write-only class in java?

1027

How can we create a synchronized collection from given collection?

1085

Why are lists ordered in java?

1010

How does a cookie work in Servlets?

842

What is linked hashmap and its features?

1009

What is the base class of all classes?

1059

What is native method in java?

1058

How many bytes is a url?

986

What is the difference between equals() and?

1194

how come we know the object is no more used in the class?

6465

Explain about main thread in java?

1081

What is difference between float and double?

962

How to find the given number is a prime number or not by getting input from the user

1098

What is regex used for?

992

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