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Core Java Interview Questions
Questions Answers Views Company eMail

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

HCL,

4 16216

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

2 2775

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

4 12004

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

1 3281

what is main difference between architecture,framework and design pattren

3 13410

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

4 3421

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 3306

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

4 3781

what is an object class?Explain its methods?

6 8611

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 2384

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 2392

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

Accenture, CTS,

4 16611

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

TCS,

1 3704

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

2 6826

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 11221


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Un-Answered Questions { Core Java }

How do you calculate square roots?

167


How many bits is size_t?

148


How do you convert boolean to boolean?

143


What is a Transient Object?

208


Is java call by reference?

146






What is locale in java?

154


What is a for loop in java?

148


Explain the Propertie sof class?

189


What is the difference between superclass and subclass?

175


What is final, finally, finalize?

202


There are two classes named classa and classb. Both classes are in the same package. Can a private member of classa can be accessed by an object of classb?

272


Is arraylist an object in java?

122


Which collection allows duplicate values in java?

121


What is the point of polymorphism java?

149


What is a dot notation?

160