What is the difference between User exit and BADI

Question

in user exit support to  4 types of exits(Menu exit,Screen exit,Field exit,Function module exit)in similar way  is badi  supported to all  type

Answer 1

hi,
BADIs (Business Add-Ins) are the new way in which SAP allows you to enter additional logic into an application, and is based on OO ABAP. (Methods in Interfaces) Transactions SE18/SE19.
Customer Exits are the older method (which is still supported), whereby you create an include that is in a function module, which is called when the customer exit is activated. Transactions CMOD/SMOD.
In terms of terminology, people often use the terms "Customer Exit" and "User Exit" interchangeably, however, strictly speaking, User Exits are places provided in subroutines (notably in the SD module) where you can insert your own code, but require a modification to an include (although it is provided for customers to change).
They are two different methods to do the same thing: to check and update the data into std trx.
The user-exit is the old concept based on function module
The BADI is the new concept based on OO ABAP.
So you can often to find a BADI and an USER-EXIT to do the same thing and you have to decide what you prefer to use.
Anyway the new trx and the enjoy trx use BADIs as exit
User-exits are SAP's oldest way of updating data in standard programs - see MV45AFZZ - Form Userexit_Save_Document_Prepare.
Here you simply add ABAP code or add INCLUDES, etc
Customer-exits were SAP's next generation. They are built on the concept of function modules - where you add your custom within the Z func modules.
BADIs are SAP's newest and current way of updating data uisng Object-oriented concepts.
Please check this link.
http://www.sap-img.com/abap/difference-between-badi-and-user-exits.htm
Check the below links:
http://sap.ittoolbox.com/groups/technical-functional/sap-r3-dev/badi-vs-user-exit-405324
http://www.sapfans.com/forums/viewtopic.php?t=172792
User-Exit is a specific place in a transaction-process where SAP offers
third parties to include there own business functionality. Actually
User-Exit is the namespace used for Exits programmed by SAP specifically
for SD. For the other modules it's called Customer-Exit.=20
>Business Add-Ins (BADI) =20
The use of object orientated code within SAP has lead to new method of
enhancing standard SAP code called Business Add-Ins or BADI's for short.
Although the implementation concept is based on classes, methods and
inheritance you do not really have to understand this fully to implement
a BADI.
Difference between BADI's & User-Exit.
1. Check the replies for your question which asked by another person.
http://sap.ittoolbox.com/groups/technical-functional/sap-r3-dev/569786
2. Similar thread.
http://www.sapfans.com/forums/viewtopic.php?p=559472&sid=99caa729618b18a8f7c46cc2f047af52
3. Same question explained
http://www.sap-img.com/abap/difference-between-badi-and-user-exits.htm
Badi Tutorials
1. Sample program.
http://www.sap-img.com/abap/business-add-in-you-need-to-understand-abap-oo-interface-concept.htm
2. Implementing BADI.
http://www.sapdevelopment.co.uk/enhance/enhance_badi.htm
Hope it helps.
3. From help.sap.com
http://help.sap.com/saphelp_nw04/helpdata/en/5f/071eed117c11d5b37d0050dadef62b/frameset.htm
Pls : award points if it is useful