Core Java Interview Questions
Questions Answers Views Company eMail

What is operator?

3 4408

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 25369

what is Thread?

6 5953

what is synchronization

3 4644

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

CTS, Satyam,

4 11315

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?

Google,

5 9378

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 13951

why java not supproting multiple inheritance?

5 6409

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 26553

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 13584

Why const and goto are reserved keyword in java?

1 6873

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

Global Logic, Saksoft,

2 9466

can anyone explain me the concept of autoboxing?

3 5515

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

1735

how to use crystal reports in java

2 3837


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Un-Answered Questions { Core Java }

What about method local inner classes or local inner classes in java?

559


Why do people says “java is robust”?

562


What is native method in java?

570


What is the purpose of lambda expressions?

584


Can we make constructors static?

729






What happens if we don’t define serial version uid?

572


What is the purpose of using bufferedinputstream and bufferedoutputstream classes?

556


What is the difference between && and & in java?

574


Is array a class in java?

506


How hashmap works in java?

572


What is methodological framework?

577


How can I right-justify a string?

629


How do you clear an arraylist in java?

502


Can we extend a class with private constructor?

527


What is a bubble sort in java?

549