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 difference between equals() and?

1204

What is a ternary operator in java? What is an interface?

1007

Can a constructor call the constructor of parent class?

1048

What are serialization and deserialization?

1275

Explain the difference between the public, private, final, protected, and default modifiers?

1054

How would you convert bytes to string?

998

Difference between Preemptive scheduling vs. Time slicing?

1031

Why we cannot override static method?

1074

What if the main() method is declared as private? What happens when the static modifier is removed from the signature of the main() method?

1200

What are the differences between include directive and include action?

1205

Is simpledateformat safe to use in the multithreaded program?

1007

What are the differences between getting and load method?

1207

What is the difference between throw and throws in java?

1113

What is the difference between path and classpath variables?

1067

State the significance of public, private, protected class?

1115

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Un-Answered Questions { Core Java }

What does you mean in math?

1101

Is nullpointerexception checked or unchecked?

1043

Which class represents the socket that both the client and server use to communicate with each other?

1051

design an lru cache in java?

1013

What is anti pattern in cyber security?

1042

What is function and method in java?

958

How can you make sure that your singleton class will always return single instance in multi-threaded environment?

1037

How do you generate random numbers in java?

1015

What does regex mean?

1021

How to calculate the length of a singly linked list in java?

1045

What is the difference between jdk, jre, and jvm?

1131

What do you mean by global variable?

961

What is a literal coding?

1035

What is size of int in java?

1070

is it possible to instantiate the math class?

1046

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