Test the data format of numeric data to determine whether it's a date (see Listing 19).

测试数值数据的数据格式，以确定它是否是日期(参见清单19)。

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When you have an easy way to express numeric literals, especially in hexadecimal, you can easily build flags that correspond to specific test cases, which is a common programming trick.

当您具有容易的方式来表达数值常量时，尤其是十六进制，就可以容易地构建对应于特定测试用例的标志，这是一种常见的编程技术。

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In particular, be careful about using the equals method to test for numeric equality.

尤其在使用equals方法来检测数值之间是否相等时要小心。

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