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Core Java Interview Questions
Questions Answers Views Company eMail

What is operator?

3 3813

what is mutability?which one is mutable String or StringBuffer?and why?give examples of each which shows the mutability of each String or StringBuffer

IBM, Zenon,

4 24689

what is Thread?

6 5271

what is synchronization

3 4302

How to add two numbers with out using Arithmetic , union operators in java....? But we can use bitwise operators... but how...?

CTS, Satyam,

4 10841

Can we access private data outside of the class directly in java programming language? Why There is no runtime checking in java, which leads to access the private data directly outside of a class?


5 8775

What is the need to implement Serializable interface (with no methods) for objects which are to be serialized ? We can write our own functionality which writes objects to streams then why we need to implement and tell JVM that which objects can be serialized.

iFlex, Sapient,

6 13166

why java not supproting multiple inheritance?

5 5750

what is the purpose of method overriding in java where v r completely re-defining a inherited method instead y can't v create a new method and define.If the question is very silly plz excuse me and do reply.Thank U!

emc2, Kumaran Systems,

7 25553

If a multi threaded Java program has started numerous number of threads, at any point in time how to know which thread is currently executing/running ?

Accenture, College School Exams Tests, iFlex, NIIT,

7 12549

Why const and goto are reserved keyword in java?

1 6510

Why Wait and notify are kept in Object class although they are used only with Thread Class

Global Logic, Saksoft,

2 9056

can anyone explain me the concept of autoboxing?

3 5131

what is the use of pojo (plain old java objects)? how it is interact with crystal reports? pls urgent


how to use crystal reports in java

2 3459

Post New Core Java Questions

Un-Answered Questions { Core Java }

Can java inner class be static?


What are the 5 types of research methods?


List two java ide’s?


Define iterator and methods in iterator?


which pattern is default in scanner package?


How many JVMs can run on a single machine and what is the meaning of Just-In-Time (JIT) compiler?


Can a string be null?


Why is a string immutable?


What is a numeric format?


Is finalize() similar to a destructor?


How do generics work in java?


How to sort an array in java without using sort method?


What is tcp and udp?


Explain access modifiers in java.


State the merge-sort principle and its time complexity.