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Understanding enum

Ravi Shankar Kumar
Ranch Hand

Joined: Aug 08, 2008
Posts: 30
    
    1

Hi

can anybody tell me how enum is advantageous if i am using inside class instead of static variable keeping out of this.....


Ravi Shankar Kumar
SCJP 1.5, (Following-OCWCD)
Stephan van Hulst
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Joined: Sep 20, 2010
Posts: 3379
    
    9
Can you please rephrase your question? I'm not sure what you meant.
Sebanti Sanyal
Ranch Hand

Joined: Nov 07, 2011
Posts: 58

If you strictly want a variable to assume a value within a specific set of constants, you should be better off with an enum.


In the above example, 'Color c' can take only four values(e.g. Color.RED, Color.YELLOW, Color.BLUE or Color.GREEN), whereas, in case of 'int color', nothing stops me from assigning any value outside the four static final int constants.
Stephan van Hulst
Bartender

Joined: Sep 20, 2010
Posts: 3379
    
    9
You've already identified the most important advantage yourself.

It doesn't make sense for a Color to be 1 or 2 or 5. Colors should be RED or GREEN, etc. and there should be nothing else - like an integer value - that is of importance.

Enums provide this important distinction.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Understanding enum
 
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