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,

1128

What is meant by 'Class access modifiers'?

HCL,

1097

Compare Mutex and Semaphore in java.

Ciena,

1055

Describe the Big-O Notation.

Global Logic,

1102

What is the use of StringTokenizer class?

Hexaware, Virtusa,

1119

Difference between stack and queue?

Flextronics,

1141

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

Fidelity,

1149

What is the concatenation operator in java?

Aspire, Infogain,

1217

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

Global Logic,

1186

What is OOP's Terms with explanation?

1249

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

DELL,

1266

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

Genpact,

1064

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

InfoAxon Technologies,

1132

Can a private method be declared as static?

Global Logic,

1071

What do you understand by access specifiers in Java?

Genpact,

1058

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Un-Answered Questions { Core Java }

Can we serialize arraylist in java?

1067

How can a gui component handle its own events in java programming?

1090

What will happen if a thrown exception is not handled?

1103

What is an abstract class and what is it’s purpose?

1019

What java ide should I use?

1051

Explain runtime exceptions?

1247

How can we make a class virtual?

1186

Why string is immutable or final in java

1143

What is meant by null and void?

1039

Which is better singleton or static class?

1030

What is the difference between serializable and externalizable interfaces?

1179

Why do I need to declare the type of a variable in java?

1159

What is the use of using enum to declare a constant?

1086

Which collection is ordered in java?

1034

What is a 16 bit word?

1078

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