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Core Java - Interview Questions and Answers for 'Static final' - 8 question(s) found - Order By Newest

 Q1. Can you assign value to a static final type at runtime ?Core Java
Ans. No

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   Like         Discuss         Correct / Improve     static  final  static final     Asked in 1 Companies


 Q2. What is the advantage of using static final or constant variables in Java ? Core Java
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


 Q3. 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
Core Java
Ans. NUMBER_OF_DAYS_IN_WEEK

Constant should be such that it uniquely identifies the value it holds and context of the value. SEVEN uniquely identifies the value but doesn't express the context.

Though NUMBER_OF_DAYS_IN_WEEK and NUMBER_OF_DAYS_IN_WEEK_7 makes sense in terms of unique value identification and context but 7 at the end of constant name appears useless as all weeks have 7 days and hence it's the only value it can hold. If it would have been "number of days in a month", it would have made sense to include number of days at the end like

NUMBER_OF_DAYS_IN_MONTH_30
NUMBER_OF_DAYS_IN_MONTH_31
NUMBER_OF_DAYS_IN_MONTH_27
NUMBER_OF_DAYS_IN_MONTH_28

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   Like         Discuss         Correct / Improve     constant variables  static final variable  java conventions  java naming conventions


 Q4. 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
Core Java
Ans. NUMBER_OF_DAYS_IN_MONTH_31

Constant should be such that it uniquely identifies the value it holds and context of the value. THIRTY_ONE uniquely identifies the value but doesn't express the context. NUMBER_OF_DAYS_IN_MONTH expresses the context but doesn't specify the value clearly as different month can have different number of days.


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   Like         Discuss         Correct / Improve     constant variables  static final variable  java conventions  java naming conventions


 Q5. Would you consider creating a constant name for "null" ?

Core Java
Ans. Objective of constant variable is to provide a context to the value and provide a single point of change. In terms of context, i don't see much need for having constant name for null as null is already self explanatory. In terms of providing single point of change, it doesn't make much sense as it would necessitate that all such placeholders either hold null or a common value.



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   Like         Discuss         Correct / Improve     constant variables  static final variable  java conventions  java naming conventions


 Q6. Which of following is / are valid static final declaration ?

public static final String MAX_NUM = "10";
public static final Object NULL = null;
public static final MathContext MATH_CONTEXT = new MathContext(2,RoundingMode.CEILING);
Core Java
Ans. All are valid declarations.

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   Like         Discuss         Correct / Improve     static final  constants      basic


 Q7. How do we define constant variables in Java ?Core Java
Ans. By using static and final modifiers.

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 Q8. What will the following code print and Why

class Class1 {
static{
System.out.println("Wow");
}
public static final int xyz=1;
}

class Class2{
public static void main(String[] args) {
System.out.println(String.valueOf(Class1.xyz));
}
}
Core Java
Ans. 1

Reason being that Class1.xyz is replaced with 1 during pre compilation only and a reference to Class1 is never made.

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   Like         Discuss         Correct / Improve     static final   pre compilation



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