PROGRAM zhello_world.
START-OF-SELECTION.
WRITE 'Hello, World!'.
Instead of printing to the console, ABAP writes values to a list which will be displayed as soon as the main logic was executed.
PROGRAM zhello_world.
CLASS main DEFINITION FINAL CREATE PRIVATE.
PUBLIC SECTION.
CLASS-METHODS: start.
ENDCLASS.
CLASS main IMPLEMENTATION.
METHOD start.
cl_demo_output=>display( 'Hello World!' ).
ENDMETHOD.
ENDCLASS.
START-OF-SELECTION.
main=>start( ).
