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?

1144

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

943

What are the different ways of creating thread?

1026

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

1128

What is the use of volatile in java?

1072

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

1000

What are the steps in the jdbc connection?

1052

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

1009

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

998

What is the difference between preparedstatement and statement in java?

1178

What is the difference between synchronized and synchronized block?

1078

What is the use of join method?

1047

What do you understand by weak reference?

1023

what is the purpose of the runtime class?

1080

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

941

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Un-Answered Questions { Core Java }

What is user defined exception in Java?

1099

Make a data structure and implement an algorithm to print all the files in a directory. (The root directory can have sub-directories too.)

1353

What is variable and rules of variable?

1032

What is a return in java?

1037

What is meant by 'bit masking' in java?

1204

What is a default method?

1070

What is java lang string?

1013

What is JVM and is it platform independent?

1068

Is main an identifier?

1026

What is the use of conditional statement?

1001

What is the difference between state-based unit testing and interaction-based unit testing?

944

Explain numeric promotion?

1120

Why string is not thread safe?

1024

What is the purpose of the file class in java programming?

1042

What is a numeric string?

1042

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