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Core Java - Interview Questions and Answers for 'Variable constants' - 2 question(s) found - Order By Newest

 Q1. Why is a constant defined as a static final in Java?Core Java
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Ans. Final makes sure that the value doesn't change after initialization and static makes sure that there is only one copy that can be shared across objects.

Making it non static will unnecessarily create a different copy per object wherein the same value will kept for all copies ( as its final and cannot be changed ).

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 Q2. What is the advantage of using static final or constant variables in Java ? Core Java2016-12-20 10:52:26

Ans. Better Control - If the value is being used at multiple locations , that can be controlled better from single place. Any change would only require making single change.

Meaning , Aliasing and Better Readability - Sometimes its easy to read the value by its meaning or alias ( 0 as ZERO or 0 as NEUTRAL_VALUE ).


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   Like         Discuss         Correct / Improve     static final  final variable  variable constants


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private static final String[] COLORS = new String[] { "Red", "Green", "Blue" };
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  What are the conventions regarding constant variables or static final variables ?
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 If we have to maintain a value "7" denoting "number of days in a week" as constant variable, Which of the following is the best constant name and Why ?

SEVEN
NUMBER_OF_DAYS_IN_WEEK
NUMBER_OF_DAYS_IN_WEEK_7
 If we have to maintain a value "31" denoting "number of days in a month" as constant variable, Which of the following is the best constant name and Why ?

THIRTY_ONE
NUMBER_OF_DAYS_IN_MONTH
NUMBER_OF_DAYS_IN_MONTH_31



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