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 7449

"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 7611

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

4 11480

please send code example of inner classes?

2 5389

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

TCS,

2 6186

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

2 8865

what is the use of Clonable,and serializable interface?

1 23096

Can an interface extands a class?

5 9792

Can i have abstract class with no abstract methods?

CTS,

22 46725

what are upcasting and downcasting?

5 18179

what is the diff b/w arraylist and vector?

Code Genesis, Genesis, Sprintine Labs,

6 11420

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 14220

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).

2080

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).

2671

can we access the super class method using subclass object?

4 8167

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Un-Answered Questions { Core Java }

What is maximum size of arraylist in java?

966

What are checked exceptions?

972

How hashmap increases its size in java?

937

What is advantage of java?

960

What are examples of modifiers?

1029

Java openings 3 - 5 years, Lnt Infotech. requirements - core java, J2ee, struts, hibernate Interview Date:- 19 March 2011 Time:- 9:00 AM to 12:00 Pm Interview Location - L & T Infotech, Manapakkam, Chennai Refererral PS NO:- 291649 (Please mention this when u fill the form only then u will be considered for interview) Documents Required:- Latest Resume, Photograph and last 3 payslips Mail me on vasan2211@gmail.com once u appear for interview

3303

What is float in java?

943

What is replacefirst in java?

1038

Explain treeset?

1060

What’s the difference between callable and runnable?

1034

What is the difference between static class and normal class?

993

How do you format in java?

955

What is javac in java?

957

What is loop in java?

935

How will you print number in reverse (descending) order in BST.

949

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