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

Core Java Interview Questions

Questions Answers Views Company eMail

why there are multiple catches for a try block.don't tell me that there can be multiple exception of a code segment that's why.tell me the real fact behind this.

4 8862

Which are thin and thicK wrapper Class's in Java?

1 8503

Hi, This is ravi i have a question like this i have string "UNDERSTAND" now i want to count the letters how many times it occures.i.e from the above string the out put should be like this U-1,N-2,D-2,E-1,R-1,S-1,T-1,A-1. how can i achieve this Thnaks in advance for your response ..

7 8470

Why do inner class cannot have static declaration except static nested class?

TCS, Wipro,

2 12761

What is the basically use of finally while we know it is always executed but why?

Oracle, TCS,

5 9507

Why can't we make jsp as a controller and action servlet in struts?

TCS, Wipro,

8 12886

What is the difference between error and exception and explain in simple words not whatever is given in the book.

7 13101

What is the differnence between String Buffer and String builder despite having knowledge that String builder is faster than String Buffer and last one is threadsafe.please tell another important difference.

IBM,

3 8893

define System.out.println(); what is the meaning!

Accenture,

19 41660

whats string ?

HCL,

10 12487

After compilation of java program we'll get .class code. If it's generated in OS Windows XP will it work on OS Linux? If yes why? If no why?

Aricent,

5 9773

What are the OOAD concepts in java explain with examples?

Aricent, CTS,

4 33353

What is difference between Eclips and MyEclips?

3 7309

what is the difference between sleep() and Wait()?

Accenture, Amdocs,

10 48810

What is escape analysis algorithm in JVM and how garbage collection actually worked n how it transfer the objects from one kind of space to other?

2177

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Un-Answered Questions { Core Java }

What is method in java ?

1149

How thread scheduler schedule the task?

1109

What class allows you to read objects directly from a stream in java programming?

1147

Can we make constructors static?

1292

How many functional interfaces does java 8 have?

1082

Can an abstract class be a final class?

1047

Can a main method be overloaded?

1074

Does java map allow duplicates?

963

How do you make an arraylist empty in java?

989

What is native code?

1209

What are different exception types exceptions available in java ?

1056

Can we able to pass objects as an arguments in java?

1088

What do you understand by copy constructor in java?

985

What is the exception hierarchy in java?

1025

How do you use wildcards?

1123

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