What is the typical structure of an ABAP program?

ABAP程序的基本结构是什么?

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ABAP distinguishes between types and objects.

ABAP区分类型和对象.

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ABAP has both data types and object types.

ABAP同时具有数据类型和对象类型.

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System fields in ABAP programs can only overwritten in a few cases to control system behavior.

ABAP程序中的系统字段只在极少需要控制系统行为的时候才能被重写.

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The following table shows the system fields that can be used in ABAP programs.

下表列出了在ABAP程序中可以使用的系统字段.

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To determine type information of existing instances and type names of ABAP type system at runtime.

要在运行时通过已存在的实例与类型名来检测的类型信息.

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