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 the common usage of serialization? What exceptions occur during serialization?

588

Which way a developer should use for creating thread, i.e. Sub classing thread or implementing runnable.

510

What are the different ways of creating thread?

557

What will happen if non-synchronized method calls a static synchronized method and what kind of lock it acquires?

503

What is the use of volatile in java?

586

Mention the default values of all the elements of an array defined as an instance variable.

506

What are the steps in the jdbc connection?

560

Why singleton pattern is better than creating singleton class with static instance?

523

Write a code to create a trigger to call a stored procedure

525

What is the difference between preparedstatement and statement in java?

539

What is the difference between synchronized and synchronized block?

493

What is the use of join method?

562

What do you understand by weak reference?

543

what is the purpose of the runtime class?

543

When should you use arraylist and when should you use linkedlist?

482

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Un-Answered Questions { Core Java }

What is byte data type?

535

What is a variable in java?

518

FOR EXAMPLE WE R HAVING TWO LIST ELEMENTS ..BOTH LISTS CONTAINS ID,NAME,PLACE ..I NEED TO COMPARE BOTH IDS IN TWO LISTS,IF ID'S R SAME MEANS WE HAVE ADD THE DETAILS(LIKE NAME,PLACE) TO MAP...HOW IS POSSIBLE ?CAN ANY ONE SUGGEST?

2616

What is jit compiler ?

561

What is <> used for in java?

656

What environment variables are required to be set on a machine in order to run Java programs?

602

How to check if a list is sorted in java?

574

Define an applet in java?

619

How do you replace all in word?

512

How we create object in copy constructor?

630

what is the messsage u r going to get from an objectoriented programing?

1592

What is JDBC Driver interface?How can you retrieve data from the ResultSet

1496

What are the types of inner classes (non-static nested class) used in java?

548

What is dot operator?

561

How do you check if an arraylist is not empty?

563

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