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Core Java Interview Questions
Questions Answers Views Company eMail

What is operator?

3 3050

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 23552

what is Thread?

6 4215

what is synchronization

3 3684

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

CTS, Satyam,

4 10066

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 7811

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 11981

why java not supproting multiple inheritance?

5 4853

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 23810

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 11080

Why const and goto are reserved keyword in java?

1 5978

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

Global Logic, Saksoft,

2 8397

can anyone explain me the concept of autoboxing?

3 4429

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

1277

how to use crystal reports in java

2 2836


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Un-Answered Questions { Core Java }

Can a class have 2 constructors?

104


Can we overload final method in java?

106


Explain the private protected method modifier?

132


What is the structure of java?

112


What is a class instance variable?

163






What is the difference between super class & sub class?

143


How to find the largest value from the given array.

137


How use .contains in java?

124


Which class represents the socket that both the client and server use to communicate with each other?

155


How to write custom exception in java?

154


What is the difference between a vector & an array list?

188


Is string an object?

122


Is age discrete or continuous?

106


What is use of map in java?

98


Which java ide is used the most?

121