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 74500

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 13558

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

Wipro,

7 14388

What is an abstract class?

DBS, Wipro,

7 12811

How can final class be used?

Accenture, Wipro,

5 13649

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

Wipro,

1 13398

Java support what type of parameter passing ?

Wipro,

7 17176

Explain the term serialization?

Wipro,

10 15644

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

Infosys, Wipro,

10 17587

What is Overriding and how can it be used?

Consagous, Wipro,

7 18465

Explain pass by reference and pass by value?

IBM, Wipro,

8 17482

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 11721

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 54402

Is there any need to import java.lang package?

Sun Microsystems,

13 21475

What is UNICODE?

3 6888

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Un-Answered Questions { Core Java }

Explain the difference between serializable and externalizable in java?

527

Can we modify the throws clause of the superclass method while overriding it in the subclass?

542

What are different data types?

560

What are exception handling keywords in java?

599

What is the use of private static?

524

Describe different states of a thread.

570

How to call one constructor from the other constructor ?

595

What is the class in java?

550

Why deletion in linkedlist is fast than arraylist?

527

What is a ternary operator in java? What is an interface?

541

What two classes are used to read data only?

628

Which is bigger double or float?

517

What is the difference between variable declaration and variable initialization?

496

What is return in java?

544

What is java thread dump, how can we get java thread dump of a program?

561

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