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 Hash Table? What are the advantages of using a hash table?

Ciena,

1098

What is a Transient Object?

InfoAxon Technologies,

1096

Why declare Main() method as a static in java ?

HCL,

1093

This abstract class is correct ? abstract class A { public abstract void Disp(); public abstract void B() { } public absract virtual C() { } }

HCL,

1008

What are memory tables?

Aspiring Minds,

1105

Explain the selection sort algorithm?

Hexaware,

1070

What are daemon Threads in java?

Impetus,

1216

What is the basic concepts of OOPS?

BlackRock,

1222

What is backdrop?

Atos Origin,

1085

Can we store variables in local blocks?

Global Logic,

1365

Write a program to search a number in the given list of numbers.

Honeywell,

1043

What is a default constraint?

HCL,

1084

What isan abstract class and when do you use it?

Genpact,

1 1617

What do you understand by Header linked List?

Genpact,

1119

Difference between current previous versions of Java?

Atos Origin,

1040

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Un-Answered Questions { Core Java }

Can a set contain duplicates?

967

How can we pass argument to a function by reference instead of pass by value?

1119

What is a java string?

1097

Differentiate between a class and an object.

1048

What is string [] args?

1017

What is an object's lock and which object's have locks in java programming?

1067

Can we write method inside a method in java?

1002

Do extraneous variables affect validity?

924

What technique is carried out to find out if a particular string is empty?

1032

What do you mean by object?

994

Which method cannot be overridden in java?

1007

What is the abstraction?

1031

What is a stringbuffer?

979

What is the function of http?

1046

What is the collections api?

1066

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