8.11 Enums

8.11 Enums
An enum type declaration defines a type name for a related group of symbolic
constants. Enums are used for
.multiple choice. scenarios, in which a runtime decision is made from a
fixed number of choices that are
known at compile-time.
The example
enum Color
{
Red,
Blue,
Green
}
class Shape
{
public void Fill(Color color) {
switch(color) {
case Color.Red:
.
break;
case Color.Blue:
.
break;
Chapter 8 Language Overview
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case Color.Green:
.
break;
default:
break;
}
}
}
shows a Color enum and a method that uses this enum. The signature of the
Fill method makes it clear
that the shape can be filled with one of the given colors.
The use of enums is superior to the use of integer constants.as is common
in languages without enums.
because the use of enums makes the code more readable and self-documenting.
The self-documenting nature
of the code also makes it possible for the development tool to assist with
code writing and other .designer.
activities. For example, the use of Color rather than int for a parameter
type enables smart code editors to
suggest Color values.