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

Core Java Interview Questions

Questions Answers Views Company eMail

write a program that list all permutations of ABCDEF in which A appears before B?

Nissan,

2442

why an outer class cannot be declared as private?

1 4232

What is abstraction with strong example program? (not a general program)

3 6365

Why Java is called as purely platform independent..? Explain briefly..dont Give regular answers Explain with your own example..?

Nokia,

8 32620

Can any one say how will sort map objects in java?

TCS,

2 5085

How can u create the Object of class Without using "New" opertor?

IBM, TCS,

3 8356

How can two threads be made to communicate with each other?

HCL,

3 8787

Static Variable can referred in non-static method?

3 5358

when we create singleton design then we create private constructtor..so how JVM take private constructor to make object..but it's private..

Ness Technologies,

1 5608

Why transient variables wont participate in serialization?

2 6152

what is ststic with example

Wipro,

2011

what is purpose of collections.unmodified() method..?

Accenture,

1 11346

what is purpose of writting public static void main(Strind arg[]) in java..?

ITC Infotech,

4 7332

What is the code inside the public void actionPerformed(ActionEvent ae) override method in Applet [ Condition:- you have one TextField and One Button , you have to enter any color name inside the TextField, when you click on Button Your background will change according to your input color name]

IBM,

2 10802

how to identify duplicate values in arraylist

TCS,

2 5395

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Un-Answered Questions { Core Java }

What is early binding and late binding in java?

1114

What is the longest unicode character?

1105

Describe the various concepts related to object oriented programming (oop).

990

can I implement my own start() method? : Java thread

943

What is the static import?

1059

What is a super method?

933

What is java argument list?

889

Why is stringbuffer thread safe?

1013

What do you mean by platform independence?

998

What is collection class in java? List down its methods and interfaces.

906

What is the hashcode () and equals () used for?

965

What is an example of a constant variable?

1023

What are voids?

922

What is the difference between yielding and sleeping?

1050

What is the multi-catch block in java?

1003

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