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 an empty class? What functionality does it offer in Java?

Deloitte, EXL, JPMorgan Chase,

1352

Give any two differences between C++ and java.

GrapeCity,

1208

What do you mean by Hash Map and Hash Table?

Atos Origin,

1146

Why is String immutable?

Atos Origin,

1121

What is a local block?

Global Logic,

1194

What do you mean by exception handling in Java?

Atos Origin,

1372

What are dot operator queries?

Atos Origin,

1157

What are annotations in java?

Impetus,

1139

What is the use of a copy constructor?

Flextronics,

1042

How we can declare a static variable?

HCL,

1151

Write a function to print Fibonacci series and Tribonacci series?

Hexaware,

1223

How we create object in copy constructor?

HCL,

1172

Do we need to manually write Copy Constructor?

HCL,

1090

Why declare Main() inside the class in java ?

HCL,

1121

What is the use of using enum to declare a constant?

Fidelity,

1084

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Un-Answered Questions { Core Java }

What do you mean by chromounits in java8?

1004

Can constructor be protected in java?

1023

What is parsing and its types?

1193

Can sleep() method causes another thread to sleep?

1083

Is namespace same as package in java?

1047

What is meant by method overriding?

1172

Can we increase size of array?

1077

What is integer size in java?

1096

Name few java 8 annotations ?

1087

How do you find the independent variable?

1134

Why java is used everywhere?

1059

Difference between vector and arraylist.

1189

When we should use serialization?

1094

how can you take care of mutual exclusion using java threads? : Java thread

1101

How to declare an arraylist in java?

1198

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