摘取自《Java 5.0 Tiger 程序高手秘笈》
nicolas
111213
1．Enum作用
可定义有限集合
上古时期可通过常量类完成
2．简单的Enum
public enum EnumXXX {A, B, C, D, E}
3．Enum可当作特殊Class
Enum无public构造函数
Enum值实际上是public static final类型 (编译器隐式处理)
Enum可==或equals()比较(enum是有效的final故可比较)
Enum有values()和valueOf()
Enum实现了java.lang.Comparable
4．支持集合
Enum可做key放map或set中
5．Enum可添加方法
(Enum事实上是类)
可能需要私有构造函数
6．Enum还可继承接口
public enum EnumXX implements InterfaceXXX{}
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