Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

If you are reviewing the code of your team members, what points will you look at, assuming the performance of the application is not so great

KPIT,

2 6284

How will you convert an ArrayList to Arrays?

KPIT,

4 9290

steps to connect with Oracle Databse using TYPE-2 Jdbc driver.

3 11948

what are the methods of an object class?

3 6377

can u give one sinario when you use Abstract Class and When you use Interface.

ITC Infotech,

5 9780

Nullpointer exception is a very common exception. Why is it not made as a checked exception?

Ness Technologies,

2 7787

What is the difference between Checked and Unchecked exception? Give some examples

Ness Technologies,

2 8024

What is the purpose of having the concept of overloading?

Ness Technologies,

7 18699

How does Vector implement synchronization?

Ness Technologies,

4 12393

What is meant by Encapsulation? Can you write a class to explain encapsulation?

Ness Technologies,

8 16657

What is meant by event handling in SAX parser?

Ness Technologies,

1 6231

When you say String is immutable, what do you mean by that? Say I have String s = "Ness" s= s+"Technologies"; What will happen? If the value gets appended, then what is the meaning of immutable here?

Ness Technologies,

5 17138

Java violates few objected oriented concepts. Can you explain in what way?

Ness Technologies,

3 9040

Why java Don't Support Multiple interitence

ABC, Exilant, IBM,

8 14627

In Java why we write public static void main(String args[]) why not main()?

Aptech, GE Healthcare, Infosys, Microsoft, New Horizon, Practical Viva Questions, TCS, Wipro,

46 108850

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Un-Answered Questions { Core Java }

What are the elements of java?

1010

How many bytes is a string?

1133

What are the types of sockets in java?

1148

Is minecraft java edition free?

1119

How big is a boolean?

1033

What is the difference between a window and a frame in java programming?

1139

How do you remove an object from an arraylist in java?

971

What is the meaning of variables in research?

1034

What is a top level class in java?

1029

Is a method a procedure?

1052

can any body body expalin best definitions & best real time exaples for opps concepts.

2268

What are inner classes or non static nested classes in java?

1176

Explain when noclassdeffounderror will be raised ?

1052

What are the skills required for core java?

1017

What is treeset in java?

1003

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