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?

1101

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

1028

When the constructor of a class is invoked?

1034

What is ternary operator? Give an example.

1083

How an object is serialized in java?

992

When we should use serialization?

1027

What's the base class of all exception classes?

1064

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

1324

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?

1001

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

1059

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

984

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

1017

What is final keyword in java? Give an example.

1018

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Un-Answered Questions { Core Java }

What is java in simple terms?

1004

Is a boolean 1 bit?

1079

What are the Main functions of Java?

1093

What is jvm? How its run?

1087

What is the difference between an argument and a parameter?

991

how to create daemon thread in java?

1080

How do you sort objects in java?

978

What is a function in java?

1036

Differentiate between array list and vector in java.

1121

when should you use stringbuilder class in a program?

988

What is function and its uses?

1122

Is there is any difference between a scrollbar and a scrollpane?

994

What is thread synchronization in java?

903

Enlist few advantages of inheritance?

1076

Write a function for palindrome and factorial and explain?

1079

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