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

Core Java Interview Questions

Questions Answers Views Company eMail

Can we place the any object to key attribute of HashMap?

HCL,

4 19021

Hi friends, i am new to java. can you explain how java is secured.

2 4549

Hi Friends, can u give me Real Time example for interface and abstract class.(With Banking Example)

4 14835

when to use ArrayList and when to use HashMap in webApplication.

1 4707

what is main difference between architecture,framework and design pattren

3 15875

Hi Friends, can you explain instance in java. In general instance means "occurence of something" . In java what is instance.

4 6052

Hi Friends, I am beginner in java. what i know about synchonized keyword is,If more that one 1 thread tries to access a particular resource we can lock the method using synchronized keyword. Then after that how the lock is released and how next thread access that.Please explain with example.

5 6351

Hi Friends, can you give difference between extending thread class and implementing runnable interface.

4 6562

what is an object class?Explain its methods?

6 11916

Hi Friends, I am new to java. Can u explain about thread concept.How i know one thread is locked, and how can i force or acquire another thread for lock . Finally how to know thread is released from lock. Explain types of lock(like method level and block level) in thread.

1 3667

I have a sorting issue with a Hashmap. My constraint is that I MUST use the Hashmap and work with existing code. I do a database query and place the results in a Hashmap. When I iterate thru the Hashmap, it loses the original alphabetical sorting done by the database. So, my problem is that I must sort the results coming out of the Hashmap which is then placed into another class.

1 4507

What is Session and cookies?Explain in detail with an example?

Accenture, CTS,

4 19214

I need to know about complete topic in java's collections i with an examples

TCS,

1 5073

Real Time sample code for Encapsulation and Abstraction. where to use abstract and where to use specifies like public private.

2 9422

What will happen inside init() in servlet. my interviewer asked servlet lifecycle. i said "once servlet is loaded in to memory init() will be called which performs servlet initialization " . Again interview asked what values will be initialized . what is difference between init() and init(ServletConfig config).

Infinite Computer Solutions, TCS,

2 13279

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Un-Answered Questions { Core Java }

What is super in java?

997

Define jit compiler?

1139

Why do we declare a class static?

1153

Why null value is used in string?

1048

What is meant by binding in rmi?

1009

What is array pointers ?

1031

Can the interface be final?

1007

What is nextint java?

1063

What is a marker interface?

1158

How to handle a web browser resize operation?

1076

What are the various access specifiers in java?

1002

What is methodological theory?

996

how to create constants in java?

1083

What does file separator do in java?

1014

What is the association?

988

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