Usually, coordinate values are stored in numeric columns (float, decimal, or even integer), and the specific type will not affect the code presented here.

通常，坐标值存储在数字列中(浮点、小数，甚至是整数)，具体的类型并不影响这里给出的代码。

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The second production describes in regex-like fashion more specifically what an integer literal looks like: a contiguous sequence of one or more numeric digits.

第二个结果以类regex的方式更特定地描述了一个整数值看上去象什么：一个或多个数字的连续序列。

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Adding methods to Integer allows you to create much more expressive code because you can use real Numbers to represent numeric values.

向Integer添加方法允许您创建更具表达性的代码，因为您可以使用真实的数字表示数值。

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