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What is the usage on enum types?

 
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What is the usage on enum types and where they are useful?
 
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Anywhere you to abstract a finite set of values. A classic example is card suits:

The primary advantages are code readability and type-safety.
 
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If you know all the possible states of what you are describing in your code when you compile it then you should use enumerated types. Simples.
 
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A (smallish) finite set of things is always a good candidate. As Bear's example illustrates, it's much easier to read and understand code that says

if (card.getSuit().equals(HEARTS))

than code that says

if (card.getSuit() == 2)
 
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