{"id":7458,"date":"2025-08-07T13:07:25","date_gmt":"2025-08-07T07:37:25","guid":{"rendered":"https:\/\/www.sapewmhelp.com\/?question=types-of-inheritance-in-sap-ooabap"},"modified":"2025-08-07T13:07:25","modified_gmt":"2025-08-07T07:37:25","slug":"types-of-inheritance-in-sap-ooabap","status":"publish","type":"question","link":"https:\/\/www.sapewmhelp.com\/?question=types-of-inheritance-in-sap-ooabap","title":{"rendered":"Types of Inheritance in SAP OOABAP"},"content":{"rendered":"

1. Single Inheritance<\/strong> (Supported in ABAP)<\/em><\/h3>\n
    \n
  • Definition:<\/strong> One subclass inherits from one superclass.<\/li>\n
  • Use:<\/strong> Most common form of inheritance.<\/li>\n<\/ul>\n
    \n
    CLASS\u00a0<\/span>parent_class\u00a0DEFINITION<\/span>.<\/span>
    \u00a0\u00a0PUBLIC\u00a0<\/span>SECTION<\/span>.<\/span>
    \u00a0\u00a0\u00a0\u00a0METHODS<\/span>:\u00a0<\/span>display.<\/span>
    ENDCLASS<\/span>.<\/span>

    CLASS\u00a0<\/span>parent_class\u00a0IMPLEMENTATION<\/span>.<\/span>
    \u00a0\u00a0METHOD\u00a0<\/span>display.<\/span>
    \u00a0\u00a0\u00a0\u00a0WRITE<\/span>:\u00a0<\/span>'Parent\u00a0class\u00a0method'<\/span>.<\/span>
    \u00a0\u00a0ENDMETHOD<\/span>.<\/span>
    ENDCLASS<\/span>.<\/span>

    CLASS\u00a0<\/span>child_class\u00a0DEFINITION\u00a0<\/span>INHERITING\u00a0<\/span>FROM\u00a0<\/span>parent_class.<\/span>
    ENDCLASS<\/span>.<\/span>

    CLASS\u00a0<\/span>child_class\u00a0IMPLEMENTATION<\/span>.<\/span>
    ENDCLASS<\/span>.<\/span>
    <\/span> <\/code><\/pre>\n
    2. Multilevel Inheritance<\/strong> (Supported in ABAP)<\/em><\/h3>\n
      \n
    • Definition:<\/strong> A class inherits from a child class, which itself inherited from a parent class.<\/li>\n
    • Hierarchy:<\/strong> Grandparent \u2192 Parent \u2192 Child<\/li>\n<\/ul>\n
      \n
      CLASS\u00a0<\/span>grandparent\u00a0DEFINITION<\/span>.<\/span>
      \u00a0\u00a0PUBLIC\u00a0<\/span>SECTION<\/span>.<\/span>
      \u00a0\u00a0\u00a0\u00a0METHODS<\/span>:\u00a0<\/span>method_gp.<\/span>
      ENDCLASS<\/span>.<\/span>

      CLASS\u00a0<\/span>parent\u00a0DEFINITION\u00a0<\/span>INHERITING\u00a0<\/span>FROM\u00a0<\/span>grandparent.<\/span>
      \u00a0\u00a0PUBLIC\u00a0<\/span>SECTION<\/span>.<\/span>
      \u00a0\u00a0\u00a0\u00a0METHODS<\/span>:\u00a0<\/span>method_p.<\/span>
      ENDCLASS<\/span>.<\/span>

      CLASS\u00a0<\/span>child\u00a0DEFINITION\u00a0<\/span>INHERITING\u00a0<\/span>FROM\u00a0<\/span>parent.<\/span>
      \u00a0\u00a0PUBLIC\u00a0<\/span>SECTION<\/span>.<\/span>
      \u00a0\u00a0\u00a0\u00a0METHODS<\/span>:\u00a0<\/span>method_c.<\/span>
      ENDCLASS<\/span>.<\/span><\/span> <\/code><\/pre>\n
      3. Hierarchical Inheritance<\/strong> (Supported via multilevel in ABAP)<\/em><\/h3>\n
        \n
      • Definition:<\/strong> Similar to multilevel, but describes a tree of inheritance.<\/li>\n
      • ABAP supports this by chaining multiple single inheritances.<\/li>\n<\/ul>\n
        4. Multiple Inheritance<\/strong> (\u274c Not Supported Directly in ABAP)<\/em><\/h3>\n
          \n
        • Definition:<\/strong> A class inherits from more than one superclass.<\/li>\n
        • ABAP Limitation:<\/strong> ABAP allows a class to inherit from only one class<\/strong> directly.<\/li>\n
        • Alternative:<\/strong> Use interfaces<\/strong> to simulate multiple inheritance.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","question-category":[174],"question_tags":[178,264,168,177],"class_list":["post-7458","question","type-question","status-publish","hentry","question-category-ooabap","question_tags-abap","question_tags-object-oriented","question_tags-ooabap","question_tags-sap"],"_links":{"self":[{"href":"https:\/\/www.sapewmhelp.com\/index.php?rest_route=\/wp\/v2\/question\/7458","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sapewmhelp.com\/index.php?rest_route=\/wp\/v2\/question"}],"about":[{"href":"https:\/\/www.sapewmhelp.com\/index.php?rest_route=\/wp\/v2\/types\/question"}],"author":[{"embeddable":true,"href":"https:\/\/www.sapewmhelp.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sapewmhelp.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7458"}],"wp:attachment":[{"href":"https:\/\/www.sapewmhelp.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7458"}],"wp:term":[{"taxonomy":"question-category","embeddable":true,"href":"https:\/\/www.sapewmhelp.com\/index.php?rest_route=%2Fwp%2Fv2%2Fquestion-category&post=7458"},{"taxonomy":"question_tags","embeddable":true,"href":"https:\/\/www.sapewmhelp.com\/index.php?rest_route=%2Fwp%2Fv2%2Fquestion_tags&post=7458"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}