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?

1123

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

929

What are the different ways of creating thread?

1013

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

1108

What is the use of volatile in java?

1059

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

984

What are the steps in the jdbc connection?

1022

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

1000

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

979

What is the difference between preparedstatement and statement in java?

1163

What is the difference between synchronized and synchronized block?

1066

What is the use of join method?

1032

What do you understand by weak reference?

1011

what is the purpose of the runtime class?

1065

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

932

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Un-Answered Questions { Core Java }

How do you check if a number is a perfect square?

992

What is a super method?

978

Why javac is not recognized?

942

what r advatages of websphere? & how to deploy?

2196

Which package is always imported by default?

1101

What is the use of default method in interface in java? Explain

1006

Does java return by reference?

1002

What is a parent class in java?

1016

How can we achieve thread safety in java?

1151

describe synchronization in respect to multithreading? : Java thread

925

Can a constructor be made final?

1112

If an object is garbage collected, can it become reachable again?

997

What is a nonetype?

1128

Where we write javascript code in html page?

1057

How to perform selection sort in java?

999

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