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

Core Java Interview Questions

Questions Answers Views Company eMail

My interview asked what is dynamic variable in java and where we use them.

IBM,

2 7749

"we cannot create an object of interface but we can create a variable of it".diacuss the statement with the help of an example.

2 7828

Can I create any Marker Interface? If yes then how can I use it???

4 11816

please send code example of inner classes?

2 5612

what is the use of clone method? why user cant overwrite in sub class without its proper defination.

TCS,

2 6431

what is object deep copy and shallow copy and why it is required?

2 9079

what is the use of Clonable,and serializable interface?

1 23268

Can an interface extands a class?

5 10213

Can i have abstract class with no abstract methods?

CTS,

22 48029

what are upcasting and downcasting?

5 18546

what is the diff b/w arraylist and vector?

Code Genesis, Genesis, Sprintine Labs,

6 11921

What is actual difference between statement,prepared statement and callable statement and when we have to use it? pls post a answer with code and clear explanation. thanks

2 14413

Write an algorithm program in java for the following question.. 1) S is a set of integers.X is an integer obtained by sum of two digits in S. Write logic for whether or not the X is from the S. The time of algorithm should not exceed o(n logn).

2238

Write an algorithm program in java for the following question.. In a VLSI design techniques,they used rectangles to design circuits. EVery rectangle is to be placed according to x,y coordinates. Check whether or not two rectangles overlap each other. Here overlapping of rectangles is acceptable, if 1) one rectangle intersect with other. 2) one rectangle fully covers other. The time of algorithm should not exceed o(n logn).

2776

can we access the super class method using subclass object?

4 8555

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Un-Answered Questions { Core Java }

How do you print array in java?

1051

Similarity and difference between static block and static method ?

983

Can we nested try statements in java?

1151

How do I type unicode?

1032

What are synchronized methods ?

1161

What is google full form?

1070

What is an argument in java?

993

Can we have this () and super () together?

1102

What is exception in java?

1170

How big is a pointer?

1082

How do you clear an arraylist in java?

1024

Can a final variable be manipulated in java?

1047

List out benefits of object oriented programming language?

947

What is Java Reflection API? Why it’s so important to have?

1246

What is string variable?

1114

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