Why C# has "readonly field" and "const value", while Java has only
"final"?
Are there any reasons for doing so?
"final"?
Are there any reasons for doing so?
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Re: Simple question
const is something that is better applied for true constants (the speed
of light, days of the week, number of seconds in a minute, etc, etc).
readonly is better suited for those things that require initialization,
which aren't necessarily known before the app is run. Good examples are the
local computer name, the startup time of a program, etc, etc. Basically,
things that won't change, but require some sort of work to find out when the
app is run.
--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m
<count1986@gmai l.comwrote in message
news:1190482660 .710979.167840@ 19g2000hsx.goog legroups.com...Why C# has "readonly field" and "const value", while Java has only
"final"?
Are there any reasons for doing so?
> -
Re: Simple question
Hi,
Extracted from MSDN :
Note The readonly keyword is different from the const keyword. A const
field can only be initialized at the declaration of the field. A
readonly field can be initialized either at the declaration or in a
constructor. Therefore, readonly fields can have different values
depending on the constructor used. Also, while a const field is a
compile-time constant, the readonly field can be used for runtime
constants as in the following example:
public static readonly uint l1 = (uint) DateTime.Now.Ti cks;
@= http://msdn2.microsoft.com/en-us/lib...b7(VS.71).aspx
count1986@gmail .com wrote:Why C# has "readonly field" and "const value", while Java has only
"final"?
Are there any reasons for doing so?
>Comment
-
Re: Simple question
<count1986@gmai l.comwrote:Well, in Java if you have a static final value which is of anWhy C# has "readonly field" and "const value", while Java has only
"final"?
Are there any reasons for doing so?
appropriate type (numeric or string, IIRC) it's treated in the same way
as "const" is in C# - i.e. the value is compiled into any code
referencing it, rather than the value being fetched at execution time.
Personally, I prefer the way that C# makes that explicit.
--
Jon Skeet - <skeet@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
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