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Core Java Interview Questions
Questions Answers Views Company eMail

what is ennumaration?

Amdocs,

2 5077

what is difference between servletconfig and servletcontext?

Amdocs,

3 5384

what is custom tags with example?

Amdocs,

3 3922

what is connection pooling with example?

Amdocs,

3 8612

what is the use of bean managed and container managed with example?

EDS,

1152

what is difference between type 4 driver and type 1 driver?

CMC, CTS, IBM, JK Technosoft, Napier Healthcare,

2 11209

what is difference between prepare stetement and callable starement with example?

CMC,

1 3629

what is the use of abstract class and interface with example?

Cycore, DNS, Technoram,

2 12677

what is overloading and overriding with example?

CMC,

2 14436

C and C++ has constructors and distructors, why does Java does not have distructors?

T3 Softwares,

1 3092

How is Garbage collection done in Java?

T3 Softwares,

3 7034

Difference between overloading and Overriding. (also asked in PA Consultancy Group,iflex,Value chain,IBM,CTS,Accenture, Tarang>

Accenture, CTS, Extensio, IBM, iFlex, PA Consulting, Symphony, Tarang,

12 24150

where is .equals() method and how is it different from == operation Is hashing related to these?

iFlex,

4 5056

explain System.out.println()

CTS,

12 13833

what is wrapper class and its uses?

2 4889


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Un-Answered Questions { Core Java }

Can we make the abstract methods static in java?

141


What is a constructor, constructor overloading in java?

125


Can we declare a class as static?

175


Can you achieve runtime polymorphism by data members?

161


I have multiple constructors defined in a class. Is it possible to call a constructor from another constructor’s body?

147






What is a flag variable?

113


What is flush buffer?

111


How do you reverse a list?

116


Why stringbuilder is not thread safe?

101


What is t in generics in java?

123


Is int primitive data type?

106


What is the main difference between java platform and other platforms?

155


Can we call the run() method instead of start()?

146


What is the arraylist in java?

105


Are floats faster than doubles?

119