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why Enum introduced in 5 called "Typesafe Enum" ?

 
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Any thoughts why Enum introduced in 5 called "Typesafe Enum" ?
what type of type safty issue does it resolve?

 
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Read Beware of Java typesafe enumerations and More on typesafe enums to understand the problem Enum solves.
 
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@ Ulf
Both links are very helpful
 
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