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?

1136

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

935

What are the different ways of creating thread?

1014

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

1115

What is the use of volatile in java?

1060

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

990

What are the steps in the jdbc connection?

1032

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

1004

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

987

What is the difference between preparedstatement and statement in java?

1175

What is the difference between synchronized and synchronized block?

1070

What is the use of join method?

1035

What do you understand by weak reference?

1017

what is the purpose of the runtime class?

1067

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

934

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Un-Answered Questions { Core Java }

Is list thread safe in java?

929

What is lifetime variable?

968

What is the difference between int and integer in java?

1036

What is primitive array?

906

How thread scheduler schedule the task?

1064

Which number is denoted by leading zero in java?

1247

What is the difference between multitasking and multithreading in Java

1193

when should you use stringbuilder class in a program?

991

What is the += operator called?

1067

Is an integer an object?

972

Explain serialization and deserialization in java?

1014

Is Java a dying language?

1091

What are the basics of core java?

1023

Does java map allow duplicates?

905

What do you understand by the term wrapper classes?

1009

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