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

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Core Java Interview Questions

Questions Answers Views Company eMail

what are the disadvantages of indexes in oracle?

3i Infotech, Wells Fargo,

1701

How we get some middle records in one table?

3i Infotech,

2 5107

tell me some common

TCS,

2 3254

Which is the best way of exception handling?

Oracle,

2 5595

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

eClinical Solutions, eClinical Works, eClinicalWorks,

1 5976

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

1 2939

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

Arfin, TCS,

2 3943

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

IBS,

1 5433

what is the diffrences between platform independent and portable

TCS,

5 19394

Java support call by reference (pass by reference) ?

HCL,

1 3568

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 4689

difference between vectorlist and hash

TCS,

1 3302

why HashTable not allow null key and value

Crimson Logic,

2 20378

why string constant pool in java

TCS,

2 7525

why top level class could not be static

L&T,

3 11077

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Un-Answered Questions { Core Java }

Explain the importance of thread scheduler in java?

442

What is the difference between post and put?

386

Explain the importance of throwable class and its methods?

418

What do you mean by object?

395

What is logical variable?

348

How can I debug the Java security exceptions and AccessControlExceptions?

441

What are the two environment variables that must be set in order to run any java programs?

372

What is final keyword in java?

398

What is meant by object?

430

Is arraylist ordered in java?

390

Why wait and notify methods are declared in object class?

403

How does thread synchronization occurs inside a monitor?

388

what is singleton class in java?

447

What are thread groups?

412

What is math floor in java?

321

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