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 a Presistent Object?

InfoAxon Technologies,

1293

How do you find the maximum number from an array without comparing and sorting?

BlackRock,

1180

What do you mean by a JVM?

GE,

1361

Explain the selection sort algorithm and state its time complexity?

Flextronics,

1073

Give me an example of array and linked list? Where they can be used?

Ericsson,

1065

What is meant by 'bit masking' in java?

DELL,

1262

If we allocate the memory using 'new' & de-allocated using 'free' then what will happen?

CDAC,

1095

What is an interoperable application in java ?

HCL,

1061

These static constructors are correct ? class A { statc intA() { } static A(int x,int y) { } static A(int x) { } }

HCL,

1142

What is the difference between Error, defect,fault, failure and mistake?

HCL,

1249

What are assertions in java?

Impetus,

1 2248

How are java objects passed to a method and what are native methods?

Genpact,

1130

What is scope & storage allocation of global and extern variables? Explain with an example

IBS,

1097

Explain with example the concept of constant variable in java.

HCL,

1265

what is the purpose of "virtual"?

EDS,

1133

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Un-Answered Questions { Core Java }

What is array command?

1269

What is bufferedreader in java?

1107

What is array pointers ?

1089

Explain abstract class in java?

1132

When super keyword is used?

1065

Give any two differences between C++ and java.

1208

What do you mean by a JVM?

1361

What is string value?

1238

How to read and write image from a file ?

1107

What is the difference between the font and fontmetrics classes in java programming?

1264

Tell us something about an iterator.

1016

Why scanner is used in java?

1139

Mention some features of java?

1015

What is the differences between c++ and java? Explain

1110

How do you decide when to use arraylist and linkedlist?

1051

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