This is not intended to be an exercise in TDD, as that would require the test to drive the development. This exercise is designed to get an understanding of how you can use mocks, stubs and fakes in a ...

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。