Java 基本数据类型的包装类型的大部分都用到了缓存机制来提升性能。 Byte, Short, Integer, Long 这 4 种包装类默认创建了数值 [-128，127] 的相应类型的缓存数据， Character 创建了数值在 [0,127] 范围的缓存数据， Boolean 直接返回 TRUE or FALSE。

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