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 more advisable to create a thread, by implementing a Runnable interface or by extending Thread class?

5 11197

what's diff between struts 1.1 & 1.2

Wipro,

3 25896

why applet doesn't have main? isn't possible a program with out main?

TCS,

9 21919

what is an virtual function

TCS,

2 5949

what is the difference b/w design pattern and architecture

Covansys,

4 9114

What is emant by API? is it related to java only or it is common for all OOPS supporting language?

3 5622

What is means by DLL file means ? What is the use of DLL file? What are the contents of DLL file?

4 12911

without using arthematic operation ,how can you write the logic for adding/substraction/multiplication?

Tanla Solutions, Wipro,

7 13517

How to create an instance of a class if the class has private constructor?

3 9480

How to create an instance of a class without using "new" operator? Plz help me out properly.Thank u.

CSC,

10 28168

how u do unit testing?

iFlex,

2 6052

How u dubugg ur project?

iFlex,

1 6356

who was the founder of java

CTS, HCL, ProKarma,

32 55646

what is mean by method signature?

Satyam,

5 9545

what is mean by String and StringBuffer? What is mean by Methooverriding and Overloading?

Satyam,

2 5727

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Un-Answered Questions { Core Java }

How does multithreading take place on a computer with a single cpu?

970

How to convert string to char and vice versa?

969

how to know the total memory occupied by the objects in the ArrayList(Array list may contain duplicate objects)

2292

What is assembly used for?

984

Is null a value?

994

Is null false in java?

1155

Is there any sort function in java?

1005

What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?

1099

Tell us something about different types of casting?

881

Which is better stringbuffer or stringbuilder?

884

explain autoboxing in java?

951

What are static variables and functions?

1093

What is the difference between size and length in java?

944

Which access specifier can be used with class ?

962

Can we declare the main method of our class as private?

966

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