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 95853

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 28680

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

Wipro,

7 29341

What is an abstract class?

DBS, Wipro,

8 27746

How can final class be used?

Accenture, Wipro,

5 27474

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

Wipro,

1 26554

Java support what type of parameter passing ?

Wipro,

7 20194

Explain the term serialization?

Wipro,

10 31393

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

Infosys, Wipro,

10 33550

What is Overriding and how can it be used?

Consagous, Wipro,

7 33267

Explain pass by reference and pass by value?

IBM, Wipro,

8 32509

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 25475

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 74445

Is there any need to import java.lang package?

Sun Microsystems,

13 25584

What is UNICODE?

3 8595

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Un-Answered Questions { Core Java }

Can we override constructors in java?

1142

what are the disadvantages of indexes in oracle?

2554

Differentiate between static and non-static methods in java.

1049

What is a marker interface?

1158

What is string in java is it a data type?

1017

What is Enum in Java?

1311

Can substring create new object?

1124

What does jre stand for?

1063

How do you generate random numbers in java?

1006

What is the purpose of return statement?

1064

What are the four corner stones of oop?

1037

What is the multi-catch block in java?

1039

What is the purpose of final keyword and when to use it?

1004

Can we extend private class in java?

983

What is the difference between ArrayList and Vector? which one is better in Java

1140

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