Core Java Interview Questions
Questions Answers Views Company eMail

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

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

32 60856

Differentiate Vector and ArrayList?

Wipro, Max Telecom,

6 9160

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

Wipro,

7 9784




What is an abstract class?

Wipro, DBS,

7 8610

How can final class be used?

Wipro, Accenture,

5 10498

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

Wipro,

1 11550

Java support what type of parameter passing ?

Wipro,

7 13035

Explain the term serialization?

Wipro,

10 10981




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

Wipro, Infosys,

10 12476

What is Overriding and how can it be used?

Consagous, Wipro,

7 14688

Explain pass by reference and pass by value?

IBM, Wipro,

8 13159

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 8722

What happens when a main method is declared as private?

L&T, DELL, Infosys, Sun Microsystems,

22 40215

Is there any need to import java.lang package?

Sun Microsystems,

13 16494

What is UNICODE?

3 5055


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Un-Answered Questions { Core Java }

What’s a deadlock?

55


How many bytes is a character?

22


What is remote method invocation (rmi)?

60


what is anonymous class in java?

54


What are the three best choices for a development environment?

88






What is collection sort in java?

16


What do you know about the garbate collector?

67


What does java ide mean?

28


Give some features of interface?

57


What is the maximum size of hashmap in java?

13


Explain scope or life time of local variables in java?

52


Is java same as core java?

27


What is meant by collection in java?

30


How do you stop a thread in java?

16


What is the difference between public, private, protected, and friend access?

84