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 is abstraction in java?

Akamai Technologies,

1143

what is the significance of listiterator in java?

IBS,

1121

Can you instantiate the math class in Java?

IBS,

1145

what are the methods in object?

IBS,

1205

What is encapsulation in java?

IBS, NIIT,

1175

what is singleton class in java?

Cap Gemini,

1114

what is thread in Java ?

1210

Can You Have Virtual Functions In Java?

1204

What do you know about the garbage collector in java?

TCS,

1134

What types of index data structures can you have in java?

Tech Mahindra,

1319

What is the advantage of OOP in java?

1207

What is a copy constructor in java?

Amazon,

1200

what is function overloading in java?

Tavant Technologies, TCS, Virtusa,

1363

what is recursion in java

Cap Gemini,

1253

what is abstract class in Java?

Hexaware, Syntel,

1174

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Un-Answered Questions { Core Java }

What is meant by 'bit masking' in java?

1260

What is computer compiler?

1048

Which method must be implemented by all threads?

1318

Which is the best approach for creating thread ?

1272

Define how destructors are defined in java?

1077

Is break statement can be used as labels in java?

1013

What are functions in java?

1007

What are static methods?

1106

What is a vararg?

1115

What is thread life cycle in java?

1138

What is the difference between hashmap and hashtable in java?

1176

Can we pass null as argument in java?

1004

What is return null in java?

1025

Why do we use regex?

1084

What are java packages? What's the significance of packages?

1410

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