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 8696

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

1 8435

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 8247

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

TCS, Wipro,

2 12628

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

Oracle, TCS,

5 9340

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

TCS, Wipro,

8 12618

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

7 12895

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 8755

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

Accenture,

19 41062

whats string ?

HCL,

10 12163

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 9593

What are the OOAD concepts in java explain with examples?

Aricent, CTS,

4 33213

What is difference between Eclips and MyEclips?

3 7174

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

Accenture, Amdocs,

10 48531

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?

2135

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Un-Answered Questions { Core Java }

Why javac is not recognized?

942

Which is faster set or list in java?

1033

List some java keywords sun like c, c + + keywords?

1004

Is null function in java?

1042

Explain thread in java?

1163

os is developed in c no java is more secured then c na why dont the os developed is developed using java

4229

What is a numeric string?

1027

What is double data type?

946

How do you replace a string in java?

1004

Is double bigger than float?

989

How many java versions are there?

1053

Why java is object oriented?

1029

What is bytecode verifier?

940

Which is better 64 bit or 32 bit?

942

What is mnemonic in assembly language?

1074

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