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static value need to get it from constant file in java?

Posted on 2016-11-08
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Last Modified: 2016-11-13
Hi Experts,
I have a constant value used at one place
do we need to keep it in constants file and need to get it from constants file?
If it is used in multiple place then i will keep it in constants file bcoz if any change happened i need to modify every place
If it is used in one place why we need to keep it in constant file we can use directly am i correct?
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Question by:srikotesh
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2 Comments
 
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dpearson earned 250 total points
ID: 41879950
If it's a static value you can put it anywhere and still reference it in other places:

public class MyClass {
   public final static double kTaxRate= 8.3 / 100.0 ;

   public double getTaxRate() {
      return kTaxRate ;
   }
}

public class MyOtherClass {
   public double computeTax(double cost) {
      return  cost * MyClass.kTaxRate ;
   }
}

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So it doesn't need to be in a special "constants file" but if you should declare a constant variable somewhere.

What you shouldn't do is:

public class MyClass {
   public double getTaxRate() {
      return 8.3 / 100.0 ;
   }
}

public class MyOtherClass {
   public double computeTax(double cost) {
      return  cost * 8.3 / 100.0 ;
   }
}

Open in new window


Hope that helps,

Doug
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LVL 86

Assisted Solution

by:CEHJ
CEHJ earned 250 total points
ID: 41880299
If it is used in one place why we need to keep it in constant file we can use directly am i correct?
You don't really need to, though you might say the following:
a. what if it's a general attribute and doesn't belong to a specific domain object. Let's say - the speed of light?
b. what if it later becomes necessary to address that value from various places. It would be better to refer to it as Constants.SPEED_OF_LIGHT than Main.SPEED_OF_LIGHT
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