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,

2491

why an outer class cannot be declared as private?

1 4321

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 32925

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

TCS,

2 5186

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

IBM, TCS,

3 8478

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

HCL,

3 8911

Static Variable can referred in non-static method?

3 5527

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 5697

Why transient variables wont participate in serialization?

2 6303

what is ststic with example

Wipro,

2047

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 7496

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 10939

how to identify duplicate values in arraylist

TCS,

2 5513

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Un-Answered Questions { Core Java }

Can we convert stringbuilder to string in java?

989

Can you change array size in java?

966

What is difference between string and stringbuffer?

1107

What are predicates in java 8?

1017

What is a top level class in java?

1032

how would you implement a thread pool? : Java thread

920

What is a variable and constant?

1004

How many characters is 2 bytes?

995

What is the difference between the jdk 1.02 event model and the event-delegation model introduced with jdk 1.1?

1136

Explain the pointers in Java?

1053

Explain the selection sort algorithm?

1062

What is abstract class? Explain

1045

Does list allow duplicates in java?

932

Which collection does not allow duplicates in java?

981

Where are variables stored?

975

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