Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

Difference between Web-based applications,Client- Server applications and Distributed applications?

Infosys,

3 13735

Catch(Exception e){ } in that what is Exception and purpose of that in that place exactly?

3 5090

what is the diff between Servletcontext and servletconfig?

5 7354

how many access specifiers are available in java

11 23548

How many objects are created for a singleton class

Ness Technologies,

7 15040

How to sort the elements in HashMap

Ness Technologies,

3 11944

What is non static block in java

Emphasis, Ness Technologies,

10 24150

How to synchonise HashMap

IBM,

4 8111

Program to output as below formate: 1 2 3 4 5 6 7 8 9 10

Huawei,

4 8174

Program to find greatest prime number in n numbers?

Huawei,

3 16006

program to validate the IP address? Validity range should be 0 to 255

Huawei,

1 10755

question on Thread synchronization

Huawei,

3 10326

diff b/w sleep(1000) and wait(1000)?

Huawei,

4 21271

WHAT IS THE MEANING OF ALL TYPE OF BUZZWORDS?

4 14498

who can we create the object of a class? in how many ways we can create it (max 5)

2 5706

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Un-Answered Questions { Core Java }

Explain the significance of class loaders in bootstrap?

1021

What about method local inner classes or local inner classes in java?

1109

What are the two types of streams offered by java 8?

991

What is a method in coding?

1100

What is operator overloading. Is it is supported in java?

1098

What is an abstract class and what is it’s purpose?

1017

Explain method local inner classes ?

1097

What's the base class of all exception classes?

1123

What methods are used in Servlet?Applet communication?

2314

hr interview how many minutes asking question

2096

What is ordered map in java?

1068

What are the differences between Java 1.0 and Java 2.0?

2356

What is mutable object and immutable object?

1182

What if the main() method is declared as private? What happens when the static modifier is removed from the signature of the main() method?

1243

How do you sort in descending order in java using collections sort?

971

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