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 is operator?

3 6184

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 26665

what is Thread?

6 7714

what is synchronization

3 5553

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

CTS, Satyam,

4 12570

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 11195

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 15729

why java not supproting multiple inheritance?

5 7793

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 29182

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 15663

Why const and goto are reserved keyword in java?

1 7496

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

Global Logic, Saksoft,

2 10662

can anyone explain me the concept of autoboxing?

3 6668

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

2130

how to use crystal reports in java

2 5124

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Un-Answered Questions { Core Java }

Difference between Linked list and Queue?

986

What is meant by method?

1036

What is a double?

1050

How many bits are used to represent unicode, ascii, utf-16, and utf-8 characters in java programming?

971

What is the difference between break and continue statements?

994

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

1365

Define linked list and its features with signature?

948

Explain working of call by reference function invoking.

978

Describe how to implement singleton design pattern in struts.

964

Define interface in java?

1040

What is a instance variable?

1024

What is Mutex (Mutual Exclusion Object) ?

1100

What does java stand for?

1061

What is the difference between double and float variables in java?

1100

What are exception handling keywords in java?

991

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