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 8565

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

HCL,

6 9667

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

HCL, TCS,

7 13700

wahts is mean by thread?

HCL, TCS,

22 30651

whats the diff between jsp and servlets?

HCL, TCS,

9 13904

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

Honeywell,

2 7908

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

1 4309

why java does not support mulitple inheritance directly?

TCS,

3 6555

what is the replacement for GOTO in java?

CTS,

2 13006

how can we synchronize Hash map?

CTS,

3 12163

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 8583

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 4711

What is compile time polymorphism?

CTS, Elementus Technologies, Oracle,

20 39628

What is run time polymorphism?

eClerx, Elementus Technologies,

6 19016

why is multiple inheritance not allowed in java?

Elementus Technologies, Huawei, Infosys,

7 16223

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Un-Answered Questions { Core Java }

When object is created and destroyed?

1147

In a program, initializing an array of 100 KB is throwing an out of memory exception while there is 100 MB of memory available. Why?

1124

What is the difference between throw and throws keywords?

1099

What is a string token?

1132

Explain about fail safe iterators in java?

1084

Give me example of derived data types.

1215

What is the size of an array?

1087

What is a container in a gui?

1050

java Technical questions asked by JPMC

5146

How do you use wildcards?

1127

What is the difference between a local variable and an instance variable?

1187

Is age discrete or continuous?

1197

Which is the class in java?

1119

Java is pass by value or pass by reference? Explain

1043

What does yield method of the thread class do?

1086

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