类alv和函数alv的区别是什么？

Question

我们使用的是类alv和函数alv，这两个选项之间有什么区别？

Answer 1

• 的一些区别：

- You can create screens using  function modules however classes have to call separate program to generate screens.
- Classes are more secure than FMs.
- Class type increases the performance. 
- Class type is OO, it allows more flexibility. Can have multiple ALVs in one screen.
- Classes will allow reusability better than FM because being Object Oriented.
- Classes are instantiable while function groups are not.
- Objects are the instance of class but FMs are not instances of a Function Group.
- Function modules can be executed asynchronously and can be called by other systems remotely also.
- A program can work with instances of several function groups at the same time however it cannot work with several instances of a single function group. 

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