SAP provides a detailed ABAP/4 training examples for the users, which is inbuilt into SAP and can be accessed through SE80 Transaction Code by specifying SAB* in the Development Class and clicking on the drop down and selecting the required training module.
Each module has lot of examples with short text, which can be accessed by click of mouse.
Each development class as listed below provides detailed training examples as listed below: 1. SAB0 - General 2. SAB1 - Overview 3. SAB2 - Reporting 4. SAB3 - Dialog programming 5. SAB4 - Dictionary and data model 6. SAB5 - Enhancements concept 7. SAB6 - Interfaces 8. SAB8 - SAP Script