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Core Java Interview Questions
Questions Answers Views Company eMail

What's the difference between an abstract class and interface in java?

1031

What is the significance of java packages?

1106

What are three types of loops in java?

1136

Which types of exceptions are caught at compile time?

1034

What is final keyword in java?

1021

I want my class to be developed in such a way that no other class (even derived class) can create its objects. How can I do so?

983

What is meant by anonymous class?

1025

How objects are stored in java?

1033

Can a class have multiple constructors?

1058

Describe different states of a thread.

1005

What are the various access specifiers for java classes?

1056

Can we call the constructor of a class more than once for an object?

1096

Is string a data type in java?

1020

I want to control database connections in my program and want that only one thread should be able to make database connection at a time. How can I implement this logic?

1101

Can we have two methods in a class with the same name?

1051


Post New Core Java Questions

Un-Answered Questions { Core Java }

Define reflection.

995


What is a functional interface?

1037


What is a predicate method?

1017


Given a singly linked list, how will you print out its contents in the reverse order? Can you do it with consuming any extra space?

994


When do we use synchronized blocks and advantages of using synchronized blocks?

1232


Give me some null interfaces in java?

1056


Break statement can be used as labels in java?

1002


What does java stand for?

1122


What is meant by stack and queue?

1069


what is singleton class in java?

1054


Is string passed by reference in java?

999


How to avoid memory leak in java?

1138


Does collectionutils isempty check for null?

1424


What is boolean law?

1066


Do loops java?

1015