The methods and attributes of the class or interface already exist. The parameters and exceptions required by the methods also exist. If you want to implement methods of interfaces, the interfaces should be listed in the class definition.
In the form-based mode of the Class Builder:
The ABAP Editor appears with an empty statement block between the METHOD and ENDMETHOD statements.
It is useful to display the signature of the method here. To do so, choose Signature. To close the signature display, choose Signature again.
You can also create text elements in the source code using forward navigation.
In the source code-based mode of the Class Builder:
This automatically positions the cursor in the method implementation. From here, you can start coding the method.