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 does jenkins do?

914

Explain Linked HashSet

1 1605

List methods available in Java Queue interface

1 1466

Explain Big-O notation with an example

1 1476

10. What is the output of the following Java program? class Main { public static void main(String args[]){ final int i; i = 10; System.out.println(i); } } 10. What is the output of the following Java program? class Main { public static void main(String args[]){ final int i; i = 10; System.out.println(i); } }

998

What is the output of the following Java program? class Main { public static void main(String args[]){ final int i; i = 10; System.out.println(i); } } 10. What is the output of the following Java program? class Main { public static void main(String args[]){ final int i; i = 10; System.out.println(i); } }

1 1525

Why are strings immutable in Java?

1 1546

How to convert string to int in java?

1 1478

How to use scanner in java?

1 1744

How does a cookie work in Servlets?

842

What the difference is between execute, execute Query, execute Update?

835

Is Java Platform Independent if then how?

5 1343

What will happen if we declare don’t declare the main as static?

5 1446

How many types of packages are there in Java?

5 1453

Explain different data types in Java.

5 1434

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Un-Answered Questions { Core Java }

Is java call by reference?

973

What is primitive array?

901

how to create daemon thread in java?

1074

Can we make a constructor final?

1020

Write a program to check for a prime number in java?

1041

What are the 6 functions?

974

Explain the difference between treeset and treemap in java?

971

What is a method in coding?

1055

Why Set interface contains unique elements, what internally implemented for this so that it contains unique elements?

8109

Give few difference between constructor and method?

965

What is scope & storage allocation of global and extern variables? Explain with an example

1042

Can we change the scope of the overridden method in the subclass?

1389

Explain the difference between protected and default access.

998

What is user defined exception in Java?

1080

Can a vector contain heterogenous objects?

1076

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