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

Core Java Interview Questions

Questions Answers Views Company eMail

whays is mean by inner class?

HCL, IBM, TCS,

4 8414

class A{ class B{ } } in which name u save the file,its the program compile?

HCL,

6 9459

class A { class B { psvm(String args[]) { } } } if the prg saved in A.java whats the o/p?

HCL, TCS,

7 13411

wahts is mean by thread?

HCL, TCS,

22 29860

whats the diff between jsp and servlets?

HCL, TCS,

9 13660

Hi Friends.. can any one provide the real time example for methodoverloading and methodoverriding .........

Honeywell,

2 7784

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

1 4229

why java does not support mulitple inheritance directly?

TCS,

3 6428

what is the replacement for GOTO in java?

CTS,

2 12882

how can we synchronize Hash map?

CTS,

3 12010

Can you explain the difference b/n abtract and interface with a good example,?In what cases we have use abtract and what case interface?

Satyam,

4 8427

How to deprecate a method? Show it with proper example. Plz give the answer of this.Thanx in advance. mail me: tanzeem.akhtar@gmail.com

2 4599

What is compile time polymorphism?

CTS, Elementus Technologies, Oracle,

20 39002

What is run time polymorphism?

eClerx, Elementus Technologies,

6 18789

why is multiple inheritance not allowed in java?

Elementus Technologies, Huawei, Infosys,

7 15978

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Un-Answered Questions { Core Java }

Is it possible to specify multiple jndi names when deploying an ejb?

996

Which are different kinds of source code?

1111

How do listeners work?

1044

How many classes can any class inherit java?

970

What is the difference between method overriding and overloading?

1231

Explain garbage collection in java?

982

What is a literal coding?

1026

What do you mean by an object in java?

1130

Is 0 true or is 1 true?

963

What are 3 boolean operators?

1007

When to use runnable interface vs thread class in java?

980

How do you ensure that n threads can access n resources without deadlock?

1312

What type of value does sizeof return?

1007

What is the difference between member variables initialization and assignment in a constructor?

1272

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

970

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