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,

1237

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

BlackRock,

1123

What do you mean by a JVM?

GE,

1252

Explain the selection sort algorithm and state its time complexity?

Flextronics,

1015

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

Ericsson,

1010

What is meant by 'bit masking' in java?

DELL,

1188

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

CDAC,

1042

What is an interoperable application in java ?

HCL,

1001

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

HCL,

1087

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

HCL,

1205

What are assertions in java?

Impetus,

1 2153

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

Genpact,

1081

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

IBS,

1042

Explain with example the concept of constant variable in java.

HCL,

1180

what is the purpose of "virtual"?

EDS,

1085

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Un-Answered Questions { Core Java }

Which method cannot be overridden in java?

993

What about abstract classes in java?

1065

What is data type in java?

904

Can size_t be negative?

1176

How many types of gc are there in java?

996

Can a constructor call the constructor of parent class?

1042

What are the java ide's? Explain

1044

What is the largest number a double can hold?

1045

Can we define private and protected modifiers for the members in interfaces?

1103

Why pass by reference is not possible in java?

1042

Difference between static and dynamic class loading.

1123

What is the benefit of using enum to declare a constant?

1103

Is java a software?

955

What is a vararg?

1036

How many bits are in a sentence?

1175

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