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 8560

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

1 8357

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 8061

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

TCS, Wipro,

2 12491

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

Oracle, TCS,

5 9160

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

TCS, Wipro,

8 12405

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

7 12688

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 8660

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

Accenture,

19 40533

whats string ?

HCL,

10 11889

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 9445

What are the OOAD concepts in java explain with examples?

Aricent, CTS,

4 33072

What is difference between Eclips and MyEclips?

3 7053

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

Accenture, Amdocs,

10 48265

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?

2079

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Un-Answered Questions { Core Java }

What sorting algorithm does javascript use?

948

Is java an open source?

936

What is meant by tab pans?

1164

What is the difference between declaration and definition in java?

1024

Explain tree set and its features?

1014

Does java map allow duplicates?

855

What is the maximum size of a string in java?

1023

what is the use of pojo (plain old java objects)? how it is interact with crystal reports? pls urgent

2130

Explain where variables are created in memory?

979

What is time complexity algorithm?

1003

When a byte datatype is used?

2101

What are the advantages of encapsulation in java?

973

Why we override equals() method?

994

What is a parameter example?

938

What is string and example?

1004

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