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

Core Java Interview Questions

Questions Answers Views Company eMail

How to check if linked list contains loop in java?

903

5 Coding best practices you learned in java?

1017

How does hashset works in java?

1097

Explain the difference between private, public, package and protected in java?

1044

Can we have return statement in finally clause? What will happen?

969

Write a java program to check if a number is prime or not?

1039

What is equlas() and hashcode() contract in java? Where does it used?

1135

How do you sort arraylist in descending order?

1022

How do you convert bytes to character in java?

1003

Write a program to solve producer consumer problem in java?

1017

Explain the difference between hashmap and hashtable in java?

949

What is difference between checked and unchecked exception in java?

1021

Explain the difference between extends thread vs implements runnable in java?

1134

Write a program to find maximum and minimum number in array?

1003

Write a program to calculate factorial in java?

1009

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Un-Answered Questions { Core Java }

Can we execute a program without main() method?

1044

Explain the use of volatile field modifier?

1081

What is collection class in java? List down its methods and interfaces.

968

Is it possible to specify multiple jndi names when deploying an ejb?

998

What is the use of using enum to declare a constant?

1029

What are the restrictions that are applied to the java static methods?

987

How many techniques can be employed to create a string object?

1110

What do you mean Abstraction in java?

1088

What are filterstreams?

1078

What is nested interface?

1012

Can a set contain duplicates?

952

Can we restart a thread already started in java?

1105

How would you use Bubble Sort to sort the number of elements?

1008

What is a flag value?

1029

What is hashing in java?

1042

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