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,

2489

why an outer class cannot be declared as private?

1 4320

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

3 6508

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

Nokia,

8 32921

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

TCS,

2 5184

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

IBM, TCS,

3 8477

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

HCL,

3 8908

Static Variable can referred in non-static method?

3 5523

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 5695

Why transient variables wont participate in serialization?

2 6299

what is ststic with example

Wipro,

2045

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

Accenture,

1 11418

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

ITC Infotech,

4 7493

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 10935

how to identify duplicate values in arraylist

TCS,

2 5513

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Un-Answered Questions { Core Java }

Explain the protected field modifier?

1097

How do you compare characters in java?

989

How to sort a collection of custom Objects in Java?

1058

What is the platform?

1002

What is hasnext in java?

1017

Which is faster call by value or call by reference?

940

What is the difference between JDK and JVM?

1270

Give some features of interface?

1067

What is the difference between sleep and wait in java?

966

What does super keyword do?

1073

What is collection sort in java?

945

What is the final class?

1059

What is formatted output?

956

Does java linked list allow duplicates?

971

What is the meaning of find and replace?

1031

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