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 garbage collection in Java, and how can it be used ?

Accenture, HCL, Infosys, Sara, SITS, TCS, Wipro,

32 74432

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 13528

Differentiate constructor and a method and how are it be used?

Wipro,

7 14353

What is an abstract class?

DBS, Wipro,

7 12767

How can final class be used?

Accenture, Wipro,

5 13619

By what default value is an object reference declared as an instance variable?

Wipro,

1 13391

Java support what type of parameter passing ?

Wipro,

7 17142

Explain the term serialization?

Wipro,

10 15586

Is there is any error if you have multiple main methods in the same class?

Infosys, Wipro,

10 17542

What is Overriding and how can it be used?

Consagous, Wipro,

7 18429

Explain pass by reference and pass by value?

IBM, Wipro,

8 17448

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 11696

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 54326

Is there any need to import java.lang package?

Sun Microsystems,

13 21443

What is UNICODE?

3 6871

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Un-Answered Questions { Core Java }

Write a function to find out longest palindrome in a given string?

582

How to invoke external process in java.

553

Does java vector allow null?

527

What is the common usage of serialization? What exceptions occur during serialization?

588

What are the main differences between the java platform and other platforms?

514

Why static functions are used?

557

Whats the difference between notify() and notifyall()?

557

What is mean by exception?

537

What are new features introduced with java 8 ?

540

Can I overload to string method

958

What is tcp ip in java?

574

What are the parts of methodology?

534

What is return in java?

540

How can we pass argument to a function by reference instead of pass by value?

570

What data type is a string?

498

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