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 13467

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

3 4837

what is the diff between Servletcontext and servletconfig?

5 7026

how many access specifiers are available in java

11 22819

How many objects are created for a singleton class

Ness Technologies,

7 14612

How to sort the elements in HashMap

Ness Technologies,

3 11698

What is non static block in java

Emphasis, Ness Technologies,

10 23562

How to synchonise HashMap

IBM,

4 7741

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

Huawei,

4 7882

Program to find greatest prime number in n numbers?

Huawei,

3 15729

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

Huawei,

1 10564

question on Thread synchronization

Huawei,

3 10069

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

Huawei,

4 20955

WHAT IS THE MEANING OF ALL TYPE OF BUZZWORDS?

4 14164

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

2 5494

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Un-Answered Questions { Core Java }

What is an empty class? What functionality does it offer in Java?

1217

Does importing a package imports its sub-packages as well in java?

935

When is the finalize() called? What is the purpose of finalization?

1024

Is java programming easy?

945

How do you reverse a string in java without using string buffer?

1052

Can we have more than one package statement in source file ?

981

What modifiers may be used with a top-level class?

1016

What is the numeric promotion?

962

What is difference between class and object in java?

1032

What is difference between an object and a class?

1087

What do you understand by garbage collection in Java? Can it be forced to run?

929

what is comparable and comparator interface?

946

What does += mean coding?

893

Why is method overloading not possible by changing the return type in java?

959

What is a string what operation can be performed out with the help of a string?

981

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