Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

Can we use a default constructor of a class even if an explicit constructor is defined?

1106

What's the purpose of static methods and static variables?

1100

What is the difference between comparison done by equals method and == operator?

1026

When the constructor of a class is invoked?

1034

What is ternary operator? Give an example.

1082

How an object is serialized in java?

988

When we should use serialization?

1025

What's the base class of all exception classes?

1062

In multi-threading how can we ensure that a resource isn't used by multiple threads simultaneously?

1323

What are the two environment variables that must be set in order to run any java programs?

967

What is the access scope of protected access specifier?

999

A person says that he compiled a java class successfully without even having a main method in it? Is it possible?

1056

What's the purpose of using break in each case of switch statement?

983

What are java packages? What is the significance of packages?

1015

What is final keyword in java? Give an example.

1016

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Un-Answered Questions { Core Java }

Can java inner class be static?

1024

what is optional in java 8?

1061

How does finally block differ from finalize() method?

1043

What is a parameter in matrices?

1051

What is a parameter used for?

963

What are the types of exceptions?

1060

What is the disadvantage of synchronization?

1016

What is yield () in java?

887

what is the difference between thread and runnable types? : Java thread

1007

What is the syntax and characteristics of a lambda expression?

1046

What is difference between arraylist and list in java?

1090

Is there any tag in htm to upload and download files?

1047

What do you understand by an io stream?

1047

What does method mean?

1068

What is an object in java and how is it created?

1057

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