大家好,小金来为大家解答以上的问题。constantstream，constants这个很多人还不知道,现在让我们一起来看看吧！

1、定义一个常量 在程序执行过程中 他的值不可以改变 系统说明如下：CONSTANTS const [options]. This statement declares a constant data object - that is, a constant const. The content of a constant cannot be changed at runtime of an ABAP program. You can only use it as an operands in read positions of ABAP statements. Constants that you declare in the declaration section of a class or an interface belong to static attributes of that class/interface.。

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