Skip to Content
Personal Insights
Author's profile photo Joachim Rees

How to create a class in ABAP 00 – example code, with little typing. AdT is great!

In my post https://blogs.sap.com/2022/02/24/how-to-create-a-class-in-abap-00-6-steps-to-start/ I explained what steps I take when I create a new ABAP-OO class.
Here I show those steps with an example.
I will also demonstrate how AdT helps me a lot, in the sense of creating code for me, so I don’t have to type it.

Here we go: Log in to your AdT and:

1. create a class
ctrl+shift+n -> new class

CLASS zcl_temp_delete_demo DEFINITION
  PUBLIC
  FINAL
  CREATE PUBLIC .

  PUBLIC SECTION.
  PROTECTED SECTION.
  PRIVATE SECTION.
ENDCLASS.

CLASS zcl_temp_delete_demo IMPLEMENTATION.
ENDCLASS.

2. add a method:

  PUBLIC SECTION.
METHODS: do_something_good. 

ctrl+1 to add the implementation.

3. add an interface:

  PUBLIC SECTION.
    INTERFACES zif_temp_delete_demo. 

ctrl+1 to create the interface.

interface ZIF_TEMP_DELETE_DEMO
  public .

endinterface.

4. Move the Method to interface.

ctrl+1 on the method definition -> pull-up to the interface.

5. create test class.

Switch to Test Classes tab.

Create the test-Class with a template (still on my todo list: write a little blog about my text class template)

CLASS ltc_test_something DEFINITION FOR TESTING
RISK LEVEL HARMLESS
DURATION SHORT.

  PRIVATE SECTION.
    data: cut type ref to ZCL_TEMP_DELETE_DEMO. 

    METHODS: test1_test_something FOR TESTING,
      setup.

ENDCLASS.

CLASS ltc_test_something IMPLEMENTATION.

  METHOD setup.
    cut = new ZCL_TEMP_DELETE_DEMO( ).
  ENDMETHOD.

  METHOD test1_test_something.

    "given
    "when
    "then

  ENDMETHOD.
ENDCLASS.

6. Add Interface and Class to test class, so the cut instance is created.

This actually already comes from my adt-template, so I only have to change the defintion of cut to refer to the interface instead of the class:

data: cut type ref to ZIF_TEMP_DELETE_DEMO.

Those where the 6 steps.

So what I got now is

1. this code:

CLASS zcl_temp_delete_demo DEFINITION
  PUBLIC
  FINAL
  CREATE PUBLIC .

  PUBLIC SECTION.
    INTERFACES zif_temp_delete_demo.
    ALIASES: do_something_good FOR zif_temp_delete_demo~do_something_good.

  PROTECTED SECTION.
  PRIVATE SECTION.
ENDCLASS.

CLASS zcl_temp_delete_demo IMPLEMENTATION.
  METHOD zif_temp_delete_demo~do_something_good.

  ENDMETHOD.

ENDCLASS.

And
2. this test code:

CLASS ltc_test_something DEFINITION FOR TESTING
RISK LEVEL HARMLESS
DURATION SHORT.

  PRIVATE SECTION.
    data: cut type ref to ZCL_TEMP_DELETE_DEMO. 

    METHODS: test1_test_something FOR TESTING,
      setup.

ENDCLASS.

CLASS ltc_test_something IMPLEMENTATION.

  METHOD setup.
    cut = new ZCL_TEMP_DELETE_DEMO( ).
  ENDMETHOD.

  METHOD test1_test_something.

    "given
    "when
    "then

  ENDMETHOD.
ENDCLASS.

It’s not so much – it does not do anything, yet. But it’s a solid, clean foundation. And please note how few typing I had to do: more or less only the names of class, method and interface:
zcl_temp_delete_demo
METHODS: do_something_good.
INTERFACES zif_temp_delete_demo.
jre    (  thats how my adt-Template starts. )
if      (replacing the CL in ZCL_TEMP_DELETE_DEMO).

-> Thats all. All the other lines where created using AdT-Quick-Fix and a AdT Template.

This leads me to say:
1. AdT is awesome.
2. You can start with a great code foundation, without loosing much time.

Do you habe a similar workflow?

How do you go about starting to code something?

best
Joachim

Assigned Tags

      3 Comments
      You must be Logged on to comment or reply to a post.
      Author's profile photo Jonathan Bourne
      Jonathan Bourne

      For part 5 you can use the in-built AdT template testclass, no need for a custom template.

      Author's profile photo Joachim Rees
      Joachim Rees
      Blog Post Author

      Thanks for the hint, Jonathan Bourne ! I'll check it out!

      Author's profile photo Matthew Billingham
      Matthew Billingham

      1, Create interface

      2. Create factory class with GET_INSTANCE returning an instance of the interface (no code in that method yet though!

      3. Create class to implement interface CREATE PRIVATE, make factory class a friend.

      4. Ctrl-1 add stub methods for interface

      5. In factory class r_result = new my_class( ).

      (I got this from Clean ABAP).