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?

863

Explain Linked HashSet

1 1509

List methods available in Java Queue interface

1 1367

Explain Big-O notation with an example

1 1384

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); } }

942

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 1435

Why are strings immutable in Java?

1 1443

How to convert string to int in java?

1 1387

How to use scanner in java?

1 1601

How does a cookie work in Servlets?

788

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

769

Is Java Platform Independent if then how?

5 1118

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

5 1245

How many types of packages are there in Java?

5 1273

Explain different data types in Java.

5 1206

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Un-Answered Questions { Core Java }

What data type is a string?

958

How destructors are defined in java?

1120

What is the difference between JDK and JVM?

1180

What does main method?

929

What is the difference between Java and C++?

1123

What sorting algorithm does javascript use?

933

Convert a BST into a DLL and DLL to BST in place.

1067

What are keyboard events?

1094

How the metacharacters are different from the ordinary characters?

973

What is a parameter used for?

913

What is the difference between jfc & wfc?

1012

What is a function argument in java?

943

How to optimize the javac output?

960

What is a private class in java?

969

Which of the classes will have more memory allocated?

912

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