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恕我直言，我怀疑你并不会用 Java 枚举(2)

05、EnumMapEnumMap 是一个专门针对枚举类型的 Map 接口的实现类，它可以将枚举常量作为键来使用。EnumMap 的效率比 HashMap 还要高，可以直接通过数组下标（枚举的 ordinal 值）访问到元素。和 EnumSet 不同，EnumMap 不是一个抽象类，所以创建 Enu...

恕我直言，我怀疑你并不会用 Java 枚举(1)

开门见山地说吧，enum（枚举）是 Java 1.5 时引入的关键字，它表示一种特殊类型的类，默认继承自 java.lang.Enum。为了证明这一点，我们来新建一个枚举 PlayerType：public enum PlayerType { TENNIS, FOOTBALL, ...

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更新时间 2022-11-11 13:48:26

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