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 12399

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

3 3833

what is the diff between Servletcontext and servletconfig?

5 5726

how many access specifiers are available in java

11 19876

How many objects are created for a singleton class

Ness Technologies,

7 12903

How to sort the elements in HashMap

Ness Technologies,

3 10599

What is non static block in java

Emphasis, Ness Technologies,

10 20804

How to synchonise HashMap

IBM,

4 6004

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

Huawei,

4 6733

Program to find greatest prime number in n numbers?

Huawei,

3 14519

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

Huawei,

1 9844

question on Thread synchronization

Huawei,

3 9037

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

Huawei,

4 19207

WHAT IS THE MEANING OF ALL TYPE OF BUZZWORDS?

4 12951

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

2 4622

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Un-Answered Questions { Core Java }

What is boolean in java?

500

What is static synchronization?

561

How does a for loop work?

486

How are this() and super() used with constructors in java programming?

555

Write a java program to check if a number is prime or not?

528

Why wait and notify methods are declared in object class?

594

How can we break singleton in java?

512

Which oo concept is achieved by using overloading and overriding?

526

What is multithreading and its advantages?

560

when to use ArrayList and when to use HashMap in webApplication.

3868

Can we convert stringbuffer to string?

552

What are the different types of multitasking?

641

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

571

How do you call a reference in java?

505

Does java have a compiler?

547

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