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

Core Java Interview Questions

Questions Answers Views Company eMail

What do you mean Abstraction in java?

Aspire, Infogain,

1088

What is meant by 'Class access modifiers'?

HCL,

1047

Compare Mutex and Semaphore in java.

Ciena,

1005

Describe the Big-O Notation.

Global Logic,

1047

What is the use of StringTokenizer class?

Hexaware, Virtusa,

1068

Difference between stack and queue?

Flextronics,

1076

Describe the syntax of multiple inheritance? When do we use such an inheritance?

Fidelity,

1093

What is the concatenation operator in java?

Aspire, Infogain,

1159

Explain the access modifiers for a class, method and variables?

Global Logic,

1142

What is OOP's Terms with explanation?

1187

What is better - 'bit-shift a value' or 'multiply by 2'?

DELL,

1191

How would you use Bubble Sort to sort the number of elements?

Genpact,

1006

What is close method? How it's different from Finalize & Dispose?

InfoAxon Technologies,

1065

Can a private method be declared as static?

Global Logic,

1022

What do you understand by access specifiers in Java?

Genpact,

1014

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Un-Answered Questions { Core Java }

What is the biggest integer?

1053

What is function declaration?

962

What is the difference between abstract class and interface1? What is an interface?

1073

Difference between this() and super() ?

1115

Can inner class extend any class?

1056

How much ram can a 64 bit processor theoretically?

898

What is the difference between iterator and enumeration ?

1005

What is the difference between overriding and overloading in OOPS.

1165

How do weakhashmap works?

1155

When does an object becomes eligible for garbage collection in java?

1063

how to deploy tomcatserver to weblogic server? write d following steps?

1967

How to handle a web browser resize operation?

1076

what is heap memory?

1100

What is the difference between equals() and?

1194

Explain the use of volatile field modifier?

1078

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