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 7593

"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 7722

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

4 11661

please send code example of inner classes?

2 5524

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

TCS,

2 6294

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

2 8994

what is the use of Clonable,and serializable interface?

1 23188

Can an interface extands a class?

5 10002

Can i have abstract class with no abstract methods?

CTS,

22 47408

what are upcasting and downcasting?

5 18362

what is the diff b/w arraylist and vector?

Code Genesis, Genesis, Sprintine Labs,

6 11672

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 14321

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).

2154

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).

2731

can we access the super class method using subclass object?

4 8371

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Un-Answered Questions { Core Java }

what are three ways in which a thread can enter the waiting state? : Java thread

1025

What is supplier in java?

1005

What is difference between == equals () and compareto () method?

1051

What classes of exceptions may be caught by a catch clause in java programming?

1181

Why do we declare a class static?

1157

What is finalize method?

1131

What is string subsequence method?

1132

What is java object name?

1000

What is difference between throw and throws ?

1140

What is the vector class in java programming?

1090

What is null mean in java?

1100

Objects or references which of them gets garbage collected?

970

Explain the difference between call by refrence and call by value?

1026

How does remove work in java?

982

How many characters is 2 bytes?

996

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