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Top Core Java Interview Question and Answer Job Interview 17

306 views · Published 14 October 2012 · 0:59 · Indexed 7 October 2026

Channel: Interview DOT · 2012 · Science & Technology

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Welcome to www.InterviewDot.com     How to for java prepare for Interview Questions :   Top Java Interview Questions and Answers.

Can an abstract class be final?

An abstract class may not be declared as final.

What is numeric promotion?

Numeric promotion is the conversion of a smaller numeric type to a larger numeric type, so that integer and floating-point operations may take place. In numerical promotion, byte, char, and short values are converted to int values. The int values are also converted to long values, if necessary. The long and float values are converted to double values, as required.

What is the difference between a public and a non-public class?

A public class may be accessed outside of its package. A non-public class may not be accessed outside of its package.

To what value is a variable of the Boolean type automatically initialized?

The default value of the Boolean type is false.

What is the difference between the prefix and postfix forms of the ++ operator?

The prefix form performs the increment operation and returns the value of the increment operation. The postfix form returns the current value all of the expression and then performs the increment operation on that value.


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