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Constructor - optional and default parameters



 
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PostPosted: Sat Sep 15, 2007 8:10 pm    Post subject: Constructor - optional and default parameters Reply with quote

Each class has only one instance constructor, which cannot be overloaded. But, using optional and default parameters allows seeming overloading.
Code:
report z.

class w_test definition.
  public section.
    methods:
      constructor
        importing value(p_name) type string optional
                  value(p_date) like sy-datum default sy-datum,
      show.
  private section.
    data:
      name type string,
      date like sy-datum.
endclass.

class w_test implementation.
  method constructor.
    name = p_name.
    date = p_date.
  endmethod.
  method show.
    write: / date, name.
  endmethod.
endclass.

data: w1 type ref to w_test,
      w2 like w1, w3 like w1.

END-OF-SELECTION.
* use different variants of creating the object instance:
create object w3.
create object w2 exporting p_name = '2nd'.
create object w1 exporting p_date = '20011115' p_name = '1st'.

call method: w1->show, w2->show, w3->show.
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