Update

src/zcl_demo_abap_objects_misc.clas.locals_imp.abap

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+CLASS local_class DEFINITION FRIENDS zcl_demo_abap_objects_misc.
+
+  PUBLIC SECTION.
+  PROTECTED SECTION.
+  PRIVATE SECTION.
+    CLASS-DATA hello TYPE zcl_demo_abap_objects_misc=>str4friend.
+    CLASS-METHODS say_hello.
+
+ENDCLASS.
+
+CLASS local_class IMPLEMENTATION.
+  METHOD say_hello.
+    hello = |{ zcl_demo_abap_objects_misc=>get_hello( ) } { sy-uname }.|.
+  ENDMETHOD.
+ENDCLASS.