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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 7591

"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 7719

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

4 11658

please send code example of inner classes?

2 5517

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

TCS,

2 6292

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

2 8991

what is the use of Clonable,and serializable interface?

1 23188

Can an interface extands a class?

5 9998

Can i have abstract class with no abstract methods?

CTS,

22 47401

what are upcasting and downcasting?

5 18359

what is the diff b/w arraylist and vector?

Code Genesis, Genesis, Sprintine Labs,

6 11664

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 14318

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).

2147

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).

2726

can we access the super class method using subclass object?

4 8365


Post New Core Java Questions

Un-Answered Questions { Core Java }

Can we define private and protected modifiers for the members in interfaces?

1105


How will you reverse a singly-link list?

1009


What is methodological framework?

1046


What is the difference between call by reference and call by pointer?

965


Which collection does not allow duplicates in java?

980


Why convert an applet to an application?

1104


Is vector thread safe in java?

1057


What is the default value of byte datatype in java?

936


What are the approaches that you will follow for making a program very efficient?

1078


How do you define a set in java?

1021


Can singleton class be cloned?

1052


How do you override a private method in java?

983


What if I write static public void instead of public static void in java?

1091


What is object-oriented paradigm?

1067


What are classloaders?

1021