Why the method be implemented in EntityManager.class

package javax.persistence;
public interface EntityManager
     // Methods
     void persist(java.lang.Object p1) { }
     T merge(T p1) { }
     void remove(java.lang.Object p1) { }
     T find(java.lang.Class<T> p1, java.lang.Object p2) { }
     T getReference(java.lang.Class<T> p1, java.lang.Object p2) { }
     void flush() { }
     void setFlushMode(javax.persistence.FlushModeType p1) { }
     javax.persistence.FlushModeType getFlushMode() { }
     void lock(java.lang.Object p1, javax.persistence.LockModeType p2) { }
     void refresh(java.lang.Object p1) { }
     void clear() { }
     boolean contains(java.lang.Object p1) { }
     javax.persistence.Query createQuery(java.lang.String p1) { }
     javax.persistence.Query createNamedQuery(java.lang.String p1) { }
     javax.persistence.Query createNativeQuery(java.lang.String p1) { }
     javax.persistence.Query createNativeQuery(java.lang.String p1, java.lang.Class p2) { }
     javax.persistence.Query createNativeQuery(java.lang.String p1, java.lang.String p2) { }
     void joinTransaction() { }
     java.lang.Object getDelegate() { }
     void close() { }
     boolean isOpen() { }
     javax.persistence.EntityTransaction getTransaction() { }
}

This is the first time I saw this usage. I understood it now, but I was afraid I missed some important concepts on "interface as parameter in the constructor". Therefore, I am wondering where I can find some online document about it in order to understand the usage clearly.
For example, if there are a few method implementations of interface TreeModel in MyDataModel.java, which methods will it call after calling JTree constructor? all methods or only part of them?
Thanks

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    This is the first time I saw this usage. I understood it now, but I was afraid I missed some important concepts on "interface as parameter in the constructor". Therefore, I am wondering where I can find some online document about it in order to understand the usage clearly.
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    *& Report  DEMOEXCELINTEGRATION                                        *
    INCLUDE rdemoexcelintegrationtop.
    DATA: control TYPE REF TO i_oi_ole_container_control.
    DATA: container TYPE REF TO cl_gui_custom_container.
    DATA: link_server TYPE REF TO i_oi_link_server.
    DATA: table_coll TYPE REF TO i_oi_table_collection.
    DATA: retcode TYPE t_oi_ret_string,
          document_type TYPE soi_document_type
                                           VALUE soi_doctype_excel_chart,
          document_format TYPE soi_document_type.
    DATA: doc_url TYPE t_url.
    DATA: usa_sales TYPE i VALUE 1000,
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          japan_sales TYPE i VALUE 1000,
          asia_sales TYPE i VALUE 100,
          america_sales TYPE i VALUE 100,
          africa_sales TYPE i VALUE 100.
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    DATA: BEGIN OF test_line, region(50), sales TYPE i, END OF test_line.
    DATA: test_table LIKE TABLE OF test_line.
    DATA: wa_test_table LIKE test_line.
          CLASS c_excel_document DEFINITION
    CLASS c_excel_document DEFINITION.
      PUBLIC SECTION.
        DATA: proxy TYPE REF TO i_oi_document_proxy.
        DATA: document_type TYPE soi_document_type.
        DATA: data_table TYPE sbdst_content,
              data_size TYPE i,
              doc_url TYPE t_url.
        METHODS: constructor
                  IMPORTING control TYPE REF TO i_oi_ole_container_control
                            document_type TYPE soi_document_type.
        METHODS: on_close_document
                  FOR EVENT on_close_document OF i_oi_document_proxy
                  IMPORTING document_proxy has_changed.
        METHODS: on_custom_event
                  FOR EVENT on_custom_event OF i_oi_document_proxy
                  IMPORTING document_proxy event_name param_count
                            param1 param2 param3.
        METHODS: create_document
                      IMPORTING open_inplace  TYPE c DEFAULT ' '
                      EXPORTING retcode TYPE t_oi_ret_string.
        METHODS: open_document
                      IMPORTING open_inplace  TYPE c DEFAULT ' '
                                open_readonly TYPE c DEFAULT ' '
                      EXPORTING retcode TYPE t_oi_ret_string.
        METHODS: open_document_url
                      IMPORTING open_inplace  TYPE c DEFAULT ' '
                                open_readonly TYPE c DEFAULT ' '
                                doc_url TYPE t_url DEFAULT ' '
                      EXPORTING retcode TYPE t_oi_ret_string.
        METHODS: retrieve_document
                     IMPORTING documents TYPE document_list
                     EXPORTING document_format TYPE soi_document_type
                               doc_url TYPE t_url.
        METHODS: close_document
                      IMPORTING do_save     TYPE c DEFAULT ' '
                      RETURNING value(retcode) TYPE t_oi_ret_string.
      PRIVATE SECTION.
        DATA: control  TYPE REF TO i_oi_ole_container_control.
    ENDCLASS.
    DATA: l_fcode LIKE fcode.
    DATA: document TYPE REF TO c_excel_document.
    DATA: bds_instance TYPE REF TO cl_bds_document_set.
    *&      Module  STATUS_0100  OUTPUT
    MODULE status_0100 OUTPUT.
      SET PF-STATUS 'MAIN0100'.
      SET TITLEBAR '001'.
      retcode = c_oi_errors=>ret_ok.
      IF control IS INITIAL.
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        CALL FUNCTION 'GUI_HAS_ACTIVEX'
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                  return = b_has_activex.
        IF b_has_activex IS INITIAL. MESSAGE e007. ENDIF.
        CALL METHOD c_oi_ole_control_creator=>get_ole_container_control
                          IMPORTING control = control
                                    retcode = retcode.
        CALL METHOD c_oi_errors=>show_message
                                      EXPORTING type = 'E'.
        CREATE OBJECT container
                  EXPORTING container_name = 'CONTAINER'.
        CALL METHOD control->init_control
                            EXPORTING r3_application_name =
                                                  'Demo' "#EC NOTEXT
                                      inplace_enabled = 'X'
                                      inplace_scroll_documents = 'X'
                                      parent = container
                                      register_on_close_event = 'X'
                                      register_on_custom_event = 'X'
                            IMPORTING retcode = retcode.
        CALL METHOD c_oi_errors=>show_message
                                      EXPORTING type = 'E'.
        CALL METHOD control->get_link_server
                           IMPORTING link_server = link_server
                                     retcode = retcode.
        CALL METHOD c_oi_errors=>show_message
                                      EXPORTING type = 'E'.
        CALL METHOD link_server->start_link_server
                          IMPORTING retcode = retcode.
        CALL METHOD c_oi_errors=>show_message
                                      EXPORTING type = 'E'.
        CALL METHOD control->get_table_collection
                        IMPORTING table_collection = table_coll
                                  retcode = retcode.
        PERFORM refresh_sales.
        CREATE OBJECT document
                  EXPORTING control = control
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                        IMPORTING retcode = retcode
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      ENDIF.
      IF bds_instance IS INITIAL.
        CREATE OBJECT bds_instance.
      ENDIF.
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    *&      Module  USER_COMMAND_0100  INPUT
    MODULE user_command_0100 INPUT.
      l_fcode = fcode.
      CLEAR fcode.
      CALL METHOD cl_gui_cfw=>dispatch.
      CASE l_fcode.
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            CALL METHOD document->close_document.
            FREE document.
          ENDIF.
          IF NOT link_server IS INITIAL.
            CALL METHOD link_server->stop_link_server
                                           IMPORTING retcode = retcode.
            FREE link_server.
          ENDIF.
          IF NOT table_coll IS INITIAL.
            FREE table_coll.
          ENDIF.
          IF NOT control IS INITIAL.
            CALL METHOD control->destroy_control
                                                IMPORTING retcode = retcode.
            FREE control.
          ENDIF.
          IF NOT bds_instance IS INITIAL.
            FREE bds_instance.
          ENDIF.
          LEAVE TO SCREEN 0.
        WHEN 'CREATE'.
          IF NOT control IS INITIAL.
            document->data_size = 0.
            CLEAR document->data_table.
            CALL METHOD document->create_document.
            CALL METHOD c_oi_errors=>show_message EXPORTING type = 'E'.
          ENDIF.
        WHEN 'SELECT'.
          IF NOT control IS INITIAL.
            DATA: documents TYPE document_list.
            DATA: descr TYPE document_descr.
            CLEAR documents.
            descr-document_name = 'Car Sales Chart'(do1).
            descr-document_id = 'DEMOEXCELCHART1'.
            APPEND descr TO documents.
            descr-document_name = 'Car Sales Chart 2'(do3).
            descr-document_id = 'DEMOEXCELCHART2'.
            APPEND descr TO documents.
            descr-document_name = 'Car Sales Sheet'(do2).
            descr-document_id = 'DEMOEXCELSHEET1'.
            APPEND descr TO documents.
            CLEAR doc_url.
            CALL METHOD document->retrieve_document
                        EXPORTING documents = documents
                        IMPORTING document_format = document_format
                                  doc_url = doc_url.
            IF NOT doc_url IS INITIAL.
              CALL METHOD document->close_document.
              CALL METHOD document->open_document_url
                                EXPORTING open_inplace = 'X'
                                          doc_url = doc_url
                                IMPORTING retcode = retcode.
              CALL METHOD c_oi_errors=>show_message EXPORTING type = 'E'.
            ELSE.
              MESSAGE e010.
            ENDIF.
          ENDIF.
        WHEN 'OPEN'.
          IF document->data_size NE 0.
            IF NOT control IS INITIAL.
              CALL METHOD document->open_document
                                IMPORTING retcode = retcode.
              CALL METHOD c_oi_errors=>show_message EXPORTING type = 'E'.
            ENDIF.
          ELSE.
            MESSAGE e005.
          ENDIF.
        WHEN 'INPLACE'.
          IF document->data_size NE 0.
            IF NOT control IS INITIAL.
              CALL METHOD document->open_document
                                EXPORTING open_inplace = 'X'
                                          open_readonly = 'X'
                                IMPORTING retcode = retcode.
              CALL METHOD c_oi_errors=>show_message EXPORTING type = 'E'.
            ENDIF.
          ELSE.
            MESSAGE e005.
          ENDIF.
        WHEN 'SAVEAS'.
          IF NOT document IS INITIAL AND NOT document->proxy IS INITIAL.
            CALL METHOD document->proxy->save_as
                              EXPORTING prompt_user = 'X'
                              IMPORTING retcode = retcode.
            CALL METHOD c_oi_errors=>show_message EXPORTING type = 'E'.
          ELSE.
            MESSAGE e000.
          ENDIF.
        WHEN 'CLOSE'.
          IF NOT document IS INITIAL.
            CALL METHOD document->close_document
                          EXPORTING do_save = 'X'.
            CALL METHOD c_oi_errors=>show_message EXPORTING type = 'E'.
          ELSE.
            MESSAGE e000.
          ENDIF.
        WHEN 'COPYLINK'.
          IF NOT link_server IS INITIAL.
            PERFORM refresh_sales.
            CALL METHOD link_server->execute_copy_link_dialog
                     IMPORTING retcode = retcode.
            CALL METHOD c_oi_errors=>show_message EXPORTING type = 'E'.
          ELSE.
            MESSAGE e004.
          ENDIF.
        WHEN 'REFRESH'.
          IF NOT link_server IS INITIAL.
            PERFORM refresh_sales.
          ELSE.
            MESSAGE e004.
          ENDIF.
          IF NOT document IS INITIAL AND NOT document->proxy IS INITIAL.
            CALL METHOD document->proxy->execute_macro
                          EXPORTING macro_string = 'R3StartupMacro'
                                    param_count = 1
                                    param1 = 10
                          IMPORTING retcode = retcode.
                         CHANGING  retvalue = usa_sales.
            CALL METHOD c_oi_errors=>show_message EXPORTING type = 'E'.
          ELSE.
            MESSAGE e000.
          ENDIF.
        WHEN 'PRINT'.
          IF NOT document IS INITIAL AND NOT document->proxy IS INITIAL.
            CALL METHOD document->proxy->print_document
                           EXPORTING prompt_user = 'X'
                           IMPORTING retcode = retcode.
            CALL METHOD c_oi_errors=>show_message EXPORTING type = 'E'.
          ELSE.
            MESSAGE e000.
          ENDIF.
      ENDCASE.
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    CLASS c_excel_document IMPLEMENTATION.
    CLASS c_excel_document IMPLEMENTATION.
      METHOD: constructor.
                 IMPORTING control TYPE REF TO i_oi_ole_container_control
                           document_type TYPE soi_document_type
        me->control = control.
        me->document_type = document_type.
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      METHOD create_document.
                    IMPORTING open_inplace  TYPE c DEFAULT ' '
                    RETURNING value(retcode) TYPE t_oi_ret_string.
        IF NOT proxy IS INITIAL.
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                 IMPORTING document_proxy = proxy
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                                      open_inplace = open_inplace
                            IMPORTING retcode = retcode.
        IF retcode NE c_oi_errors=>ret_ok.
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                              open_readonly TYPE c DEFAULT ' '
                    RETURNING value(retcode) TYPE t_oi_ret_string.
        IF NOT proxy IS INITIAL.
          CALL METHOD me->close_document.
        ENDIF.
        CALL METHOD control->get_document_proxy
                 EXPORTING document_type = document_type
                 IMPORTING document_proxy = proxy
                           retcode = retcode.
        IF retcode NE c_oi_errors=>ret_ok.
          EXIT.
        ENDIF.
        CALL METHOD proxy->open_document_from_table
                               EXPORTING document_table = data_table
                                         document_size  = data_size
                                         open_inplace = open_inplace
                                         open_readonly = open_readonly
                               IMPORTING retcode = retcode.
        IF retcode NE c_oi_errors=>ret_ok.
          EXIT.
        ENDIF.
        SET HANDLER me->on_close_document FOR proxy.
        SET HANDLER me->on_custom_event FOR proxy.
        CALL METHOD proxy->update_document_links
                               EXPORTING update_manual_links = 'X'
                               IMPORTING retcode = retcode.
      ENDMETHOD.
      METHOD close_document.
                    IMPORTING do_save TYPE c DEFAULT ' '
                    RETURNING value(retcode) TYPE t_oi_ret_string.
        DATA: is_closed TYPE i, has_changed TYPE i.
        DATA: doc_url(256).
        IF NOT proxy IS INITIAL.
          CALL METHOD proxy->is_destroyed IMPORTING ret_value = is_closed.
          IF is_closed IS INITIAL.
            CALL METHOD proxy->close_document
                         EXPORTING do_save = do_save
                         IMPORTING has_changed = has_changed
                                   retcode = retcode.
            IF retcode NE c_oi_errors=>ret_ok.
              EXIT.
            ENDIF.
          ENDIF.
          IF NOT has_changed IS INITIAL.
            CALL METHOD proxy->save_document_to_table
                          IMPORTING retcode = retcode
                          CHANGING  document_table = data_table
                                    document_size = data_size.
            IF retcode NE c_oi_errors=>ret_ok.
              EXIT.
            ENDIF.
          ENDIF.
          CALL METHOD proxy->release_document
                                       IMPORTING retcode = retcode.
          SET HANDLER me->on_close_document FOR proxy ACTIVATION ' '.
          SET HANDLER me->on_custom_event FOR proxy ACTIVATION ' '.
        ELSE.
          retcode = c_oi_errors=>ret_document_not_open.
        ENDIF.
      ENDMETHOD.
      METHOD open_document_url.
                    IMPORTING open_inplace  TYPE c DEFAULT ' '
                              open_readonly TYPE c DEFAULT ' '
                              doc_url TYPE t_url DEFAULT ' '
                    RETURNING value(retcode) TYPE t_oi_ret_string.
        IF NOT proxy IS INITIAL.
          CALL METHOD me->close_document.
        ENDIF.
        CALL METHOD control->get_document_proxy
                 EXPORTING document_type = document_type
                 IMPORTING document_proxy = proxy
                           retcode = retcode.
        IF retcode NE c_oi_errors=>ret_ok.
          EXIT.
        ENDIF.
        me->doc_url = doc_url.
        CALL METHOD proxy->open_document
                               EXPORTING document_url = doc_url
                                         open_inplace = open_inplace
                                         open_readonly = open_readonly
                               IMPORTING retcode = retcode.
        IF retcode NE c_oi_errors=>ret_ok.
          EXIT.
        ENDIF.
      Document shall also be available in ITAB for respective operations:
        CALL METHOD proxy->save_document_to_table
                          IMPORTING retcode = retcode
                          CHANGING  document_table = data_table
                                    document_size = data_size.
        IF retcode NE c_oi_errors=>ret_ok.
          EXIT.
        ENDIF.
        SET HANDLER me->on_close_document FOR proxy.
        SET HANDLER me->on_custom_event FOR proxy.
        CALL METHOD proxy->update_document_links
                               EXPORTING update_manual_links = 'X'
                               IMPORTING retcode = retcode.
      ENDMETHOD.
      METHOD retrieve_document.
                 importing documents type document_list
                 exporting document_format type soi_document_format
                           doc_url type t_url.
    *----BDS-Data-Structures:--
    Tables and WAs:
        DATA: doc_signature TYPE sbdst_signature,
              wa_doc_signature LIKE LINE OF doc_signature,
              doc_components TYPE sbdst_components,
              wa_doc_components LIKE LINE OF doc_components,
              doc_properties TYPE sbdst_properties,
              wa_doc_properties LIKE LINE OF doc_properties,
              doc_uris TYPE sbdst_uri,
              wa_doc_uris LIKE LINE OF doc_uris.
    ID's:
        DATA: doc_classname TYPE sbdst_classname VALUE 'SOFFICEINTEGRATION',
              doc_classtype TYPE sbdst_classtype VALUE 'OT',
            doc_object_key TYPE sbdst_object_key VALUE 'SOFFICEINTEGRATION',
              doc_mimetype TYPE bapicompon-mimetype.
        DATA: field_desc TYPE TABLE OF rsvbfidesc.
        DATA: wa_field_desc TYPE rsvbfidesc.
        DATA: l_nr LIKE sy-tabix.
        CLEAR: field_desc, wa_field_desc.
        wa_field_desc-fieldnum = 1.
        wa_field_desc-display = 'X'.
        APPEND wa_field_desc TO field_desc.
        l_nr = 0.
        CALL FUNCTION 'RS_VALUES_BOX'
             EXPORTING
                  left_upper_col = 5
                  left_upper_row = 5
                  pagesize       = 10
                  title          = 'Select document'(sdc)
             IMPORTING
                  linenumber     = l_nr
             TABLES
                  field_desc     = field_desc
                  value_tab      = documents
             EXCEPTIONS
                  OTHERS         = 1.
        IF sy-subrc EQ 0 AND l_nr NE 0.
          READ TABLE documents INDEX l_nr INTO descr.
          IF sy-subrc EQ 0.
            CLEAR: wa_doc_signature, wa_doc_components, wa_doc_uris.
            CLEAR: doc_signature, doc_components, doc_uris.
            wa_doc_signature-prop_name = 'DESCRIPTION'.
            wa_doc_signature-prop_value = descr-document_id.
            APPEND wa_doc_signature TO doc_signature.
            CALL METHOD bds_instance->get_info
                          EXPORTING classname = doc_classname
                                    classtype = doc_classtype
                                    object_key = doc_object_key
                          CHANGING components = doc_components
                                   signature = doc_signature
                          EXCEPTIONS nothing_found = 1
                                     error_kpro = 2
                                     internal_error = 3
                                     parameter_error = 4
                                     not_authorized = 5
                                     not_allowed = 6.
            IF sy-subrc NE 0 AND sy-subrc NE 1.
              MESSAGE e016.
            ENDIF.
            IF sy-subrc = 1.
              MESSAGE e017.
            ENDIF.
            CALL METHOD bds_instance->get_with_url
                               EXPORTING classname = doc_classname
                                         classtype = doc_classtype
                                         object_key = doc_object_key
                               CHANGING uris = doc_uris
                                        signature = doc_signature
                          EXCEPTIONS nothing_found = 1
                                     error_kpro = 2
                                     internal_error = 3
                                     parameter_error = 4
                                     not_authorized = 5
                                     not_allowed = 6.
            IF sy-subrc NE 0 AND sy-subrc NE 1.
              MESSAGE e016.
            ENDIF.
            IF sy-subrc = 1.
              MESSAGE e017.
            ENDIF.
            READ TABLE doc_components INTO wa_doc_components INDEX 1.
            READ TABLE doc_uris INTO wa_doc_uris INDEX 1.
            doc_mimetype = wa_doc_components-mimetype.
            doc_url = wa_doc_uris-uri.
            CASE doc_mimetype.
              WHEN 'application/x-rtf' OR 'text/rtf'.
                document_format = soi_docformat_rtf.
              WHEN 'application/x-oleobject'.
                document_format = soi_docformat_compound.
              WHEN 'text/plain'.
                document_format = soi_docformat_text.
              WHEN OTHERS.
                document_format = soi_docformat_native.
            ENDCASE.
          ENDIF.
        ENDIF.
      ENDMETHOD.
      METHOD on_close_document.
                 FOR EVENT on_close_document OF c_oi_ole_container_control
                 IMPORTING document_proxy has_changed.
        DATA: answer, do_save.
        IF has_changed EQ 1.
          CALL FUNCTION 'POPUP_TO_CONFIRM'
               EXPORTING
                    titlebar              = 'Office Integration Demo'(oid)
                    text_question         = 'Save Document?'(sav)
                    display_cancel_button = ' '
               IMPORTING
                    answer                = answer.
          IF answer EQ '1'.
            do_save = 'X'.
          ELSE.
            do_save = ' '.
          ENDIF.
          CALL METHOD me->close_document
                        EXPORTING do_save = do_save.
          CALL METHOD c_oi_errors=>show_message
                                      EXPORTING type = 'E'.
        ENDIF.
      ENDMETHOD.
      METHOD on_custom_event.
                 FOR EVENT on_custom_event OF i_oi_document_proxy
                 IMPORTING document_proxy event_name param_count
                           param1 param2 param3.
        IF event_name EQ 'ON_SERIES_CHANGE'.
          CALL METHOD table_coll->get_table
                        EXPORTING table_name = 'SALES_IN'
                        IMPORTING retcode = retcode
                        CHANGING  data_table = test_table.
          CALL METHOD c_oi_errors=>show_message
                                      EXPORTING type = 'E'.
          CLEAR wa_test_table.
          READ TABLE test_table INTO wa_test_table INDEX 1.
          usa_sales = wa_test_table-sales.
          CLEAR wa_test_table.
          READ TABLE test_table INTO wa_test_table INDEX 2.
          europe_sales = wa_test_table-sales.
          CLEAR wa_test_table.
          READ TABLE test_table INTO wa_test_table INDEX 3.
          japan_sales = wa_test_table-sales.
          CLEAR wa_test_table.
          READ TABLE test_table INTO wa_test_table INDEX 4.
          asia_sales = wa_test_table-sales.
          CLEAR wa_test_table.
          READ TABLE test_table INTO wa_test_table INDEX 5.
          america_sales = wa_test_table-sales.
          CLEAR wa_test_table.
          READ TABLE test_table INTO wa_test_table INDEX 6.
          africa_sales = wa_test_table-sales.
          CLEAR wa_test_table.
        ENDIF.
        CALL METHOD control->set_focus.
      ENDMETHOD.
    ENDCLASS.
    FORM refresh_sales.
    FORM refresh_sales.
      DATA: BEGIN OF item_line,
                 region(60),
                 sales TYPE i,
                 date  TYPE d,
                 time  TYPE t,
                 weight TYPE f,
                 amount TYPE p DECIMALS 3,
                 id(10) TYPE n,
            END OF item_line.
      DATA: sales_table LIKE TABLE OF item_line.
      DATA: wa_sales_table LIKE item_line.
      DATA: fields_table TYPE TABLE OF rfc_fields.
      DATA: wa_fields_table TYPE rfc_fields.
      DATA: ind TYPE i.
      CALL FUNCTION 'DP_GET_FIELDS_FROM_TABLE'
           TABLES
                data   = sales_table
                fields = fields_table.
      READ TABLE fields_table INDEX 1 INTO wa_fields_table.
      wa_fields_table-fieldname = 'Region'."#EC NOTEXT
      MODIFY fields_table FROM wa_fields_table INDEX 1.
      CLEAR wa_fields_table.
      READ TABLE fields_table INDEX 2 INTO wa_fields_table.
      wa_fields_table-fieldname = 'Sales'. "#EC NOTEXT
      MODIFY fields_table FROM wa_fields_table INDEX 2.
      CLEAR: sales_table, wa_sales_table.
      wa_sales_table-region = 'USA'(usa).
      wa_sales_table-sales = usa_sales.
      APPEND wa_sales_table TO sales_table.
      CLEAR wa_sales_table.
      wa_sales_table-region = 'Europe'(eur).
      wa_sales_table-sales = europe_sales.
      APPEND wa_sales_table TO sales_table.
      CLEAR wa_sales_table.
      wa_sales_table-region = 'Japan'(jap).
      wa_sales_table-sales = japan_sales.
      APPEND wa_sales_table TO sales_table.
      CLEAR wa_sales_table.
      wa_sales_table-region = 'Asia'(asi).
      wa_sales_table-sales = asia_sales.
      APPEND wa_sales_table TO sales_table.
      CLEAR wa_sales_table.
      wa_sales_table-region = 'America'(ame).
      wa_sales_table-sales = america_sales.
      APPEND wa_sales_table TO sales_table.
      CLEAR wa_sales_table.
      wa_sales_table-region = 'Africa'(afr).
      wa_sales_table-sales = africa_sales.
      APPEND wa_sales_table TO sales_table.
      CLEAR wa_sales_table.
      LOOP AT sales_table INTO wa_sales_table.
        ind = sy-tabix.
        wa_sales_table-date = sy-datum + ind.
        wa_sales_table-time = sy-uzeit + ind.
        wa_sales_table-weight = 100000 * ind.
        wa_sales_table-amount = 11111 * ind.
        wa_sales_table-id = ind.
        MODIFY sales_table FROM wa_sales_table INDEX ind.
      ENDLOOP.
      CALL METHOD table_coll->add_table
                        EXPORTING table_name = 'SALES_OUT'
                                  table_type = table_coll->table_type_output
                        IMPORTING retcode = retcode
                        CHANGING  data_table = sales_table
                                  fields_table = fields_table.
      CALL METHOD link_server->add_table_item2
               EXPORTING item_name = 'Sales'    "#EC NOTEXT
                         item_title = 'Car Sales Figures'(sal)
               IMPORTING retcode = retcode
               CHANGING  data_table = sales_table
                         fields_table = fields_table.
      CALL METHOD link_server->add_string_item
               EXPORTING item_name   = 'ChartTitle'
                         item_title  = 'Chart Title'(ti0)
                         item_value  = 'Car Sales by Region'(ti1)
                         no_flush    = 'X'
               IMPORTING retcode = retcode.
      CALL METHOD link_server->add_string_item
               EXPORTING item_name   = 'ColumnTitle1'
                         item_title  = 'Column Title 1'(ti2)
                         item_value  = 'Region'(ti3)
                         no_flush    = 'X'
               IMPORTING retcode = retcode.
      CALL METHOD link_server->add_string_item
               EXPORTING item_name   = 'ColumnTitle2'
                         item_title  = 'Column Title 2'(ti4)
                         item_value  = 'Sold Cars'(ti5)
                         no_flush    = ' '
               IMPORTING retcode = retcode.
    ENDFORM.

  • How do I alter the bytes of a Class file to add calls to the methods?

    If i had the bytes of a class file, and I wanted to alter the bytes that constitute each method for the class so that it included a call to the security manager, how would i do it?
    1. How would I know which bytes were the opening of a method?
    2. how would I know what the name of the method is?
    3. How would I create bytes for something like:
       SecurityManager sm = System.getSecurityManager().checkPermission(thismeth, subject);
    4. I assume that if by some miracle I can do the above, then all I have to do is call defineClass(...) in ClassLoader and send it the new bytes, right?
    Thanks to all!

    OK, if it will help anyone get me the answers here, I found a class on the internet that can read a class file and tell you where in the bytes a method occurs and what its name is, and how long it is. What I need now is how to convert a call into the correct manner of bytes.
    For example, so I could add the bytes that would do:
       System.out.println("Added!");
    The class that reads a class file:
    /* Inspector.java by Mark D. LaDue */
    /* June 24, 1997 */
    /* Copyright (c) 1997 Mark D. LaDue
       You may study, use, modify, and distribute this example for any purpose.
       This example is provided WITHOUT WARRANTY either expressed or implied.  */
    /* This Java application analyzes the entries in the constant pool and locates
       the code arrays in a Java class file. Each entry in the constant pool
       yields the following information:
       Index     Tag     Reference(s)/Value(s)
       where "Index" is its position within the class file's constant pool,
       "Tag" is the official tag number for that type of entry, and
       "Reference(s)/Value(s)" contains the constant pool information
       according to the entry's type.  (See Lindholm and Yellin's "The Java
       Virtual Machine Specification" for details.)  For each code array in
       the class file, its starting byte, its total length, and the name of
       the method in which it occurs are given.  Combining this information
       with the information yielded by the humble "javap" utility gives one
       sufficient information to hack the code arrays in Java class files. */
    import java.io.*;
    class Inspector {
        public static void main(String[] argv) {
            int fpointer = 8; // Where are we in the class file?
            int cp_entries = 1; // How big is the constant pool?
            int Code_entry = 1; // Where is the entry that denotes "Code"?
            int num_interfaces = 0; // How many interfaces does it use?
            int num_fields = 0; // How many fields are there?
            int num_f_attributes = 0; // How many attributes does a field have?
            int num_methods = 0; // How many methods are there?
            int num_m_attributes = 0; // How many attributes does a method have?
            int[] tags; // Tags for the constant pool entries
            int[] read_ints1; // References for some constant pool entries
            int[] read_ints2; // References for some constant pool entries
            long[] read_longs; // Values for some constant pool entries
            float[] read_floats; // Values for some constant pool entries
            double[] read_doubles; // Values for some constant pool entries
            StringBuffer[] read_strings; // Strings in some constant pool entries
            int[] method_index;
            long[] code_start;
            long[] code_length;
    // How on earth do I use this thing?
            if (argv.length != 1) {
                System.out.println("Try \"java Inspector class_file.class\"");
                System.exit(1);
    // Start by opening the file for reading
            try {
                RandomAccessFile victim = new RandomAccessFile(argv[0], "r");
    // Skip the magic number and versions and start looking at the class file
                victim.seek(fpointer);
    // Determine how many entries there are in the constant pool
                cp_entries = victim.readUnsignedShort();
                fpointer += 2;
    // Set up the arrays of useful information about the constant pool entries
                tags = new int[cp_entries];
                read_ints1 = new int[cp_entries];
                read_ints2 = new int[cp_entries];
                read_longs = new long[cp_entries];
                read_floats = new float[cp_entries];
                read_doubles = new double[cp_entries];
                read_strings = new StringBuffer[cp_entries];
    //Initialize these arrays
                for (int cnt = 0; cnt < cp_entries; cnt++) {
                    tags[cnt] = -1;
                    read_ints1[cnt] = -1;
                    read_ints2[cnt] = -1;
                    read_longs[cnt] = -1;
                    read_floats[cnt] = -1;
                    read_doubles[cnt] = -1;
                    read_strings[cnt] = new StringBuffer();
    // Look at each entry in the constant pool and save the information in it
                for (int i = 1; i < cp_entries; i++) {
                    tags[i] = victim.readUnsignedByte();
                    fpointer++;
                    int skipper = 0;
                    int start = 0;
                    int test_int = 0;
                    switch (tags) {
    case 3: read_ints1[i] = victim.readInt();
    fpointer += 4;
    break;
    case 4: read_floats[i] = victim.readFloat();
    fpointer += 4;
    break;
    case 5: read_longs[i] = victim.readLong();
    fpointer += 8;
    i++;
    break;
    case 6: read_doubles[i] = victim.readDouble();
    fpointer += 8;
    i++;
    break;
    case 7:
    case 8: read_ints1[i] = victim.readUnsignedShort();
    fpointer += 2;
    break;
    case 9:
    case 10:
    case 11:
    case 12: read_ints1[i] = victim.readUnsignedShort();
    fpointer += 2;
    victim.seek(fpointer);
    read_ints2[i] = victim.readUnsignedShort();
    fpointer += 2;
    break;
    // This is the critical case - determine an entry in the constant pool where
    // the string "Code" is found so we can later identify the code attributes
    // for the class's methods
    case 1: skipper = victim.readUnsignedShort();
    start = fpointer;
    fpointer += 2;
    victim.seek(fpointer);
    for (int cnt = 0; cnt < skipper; cnt++) {
    int next = victim.readUnsignedByte();
    switch (next) {
    case 9: read_strings[i].append("\\" + "t");
    break;
    case 10: read_strings[i].append("\\" + "n");
    break;
    case 11: read_strings[i].append("\\" + "v");
    break;
    case 13: read_strings[i].append("\\" + "r");
    break;
    default: read_strings[i].append((char)next);
    break;
    victim.seek(++fpointer);
    victim.seek(start);
    if (skipper == 4) {
    fpointer = start + 2;
    victim.seek(fpointer);
    test_int = victim.readInt();
    if (test_int == 1131373669) {Code_entry = i;}
    fpointer = fpointer + skipper;
    else {fpointer = start + skipper + 2;}
    break;
    victim.seek(fpointer);
    // Skip ahead and see how many interfaces the class implements
    fpointer += 6;
    victim.seek(fpointer);
    num_interfaces = victim.readUnsignedShort();
    // Bypass the interface information
    fpointer = fpointer + 2*(num_interfaces) + 2;
    victim.seek(fpointer);
    // Determine the number of fields
    num_fields = victim.readUnsignedShort();
    // Bypass the field information
    fpointer += 2;
    victim.seek(fpointer);
    for (int j=0; j<num_fields; j++) {
    fpointer += 6;
    victim.seek(fpointer);
    num_f_attributes = victim.readUnsignedShort();
    fpointer = fpointer + 8*(num_f_attributes) + 2;
    victim.seek(fpointer);
    // Determine the number of methods
    num_methods = victim.readUnsignedShort();
    fpointer += 2;
    // Set up the arrays of information about the class's methods
    method_index = new int[num_methods];
    code_start = new long[num_methods];
    code_length = new long[num_methods];
    //Initialize these arrays
    for (int cnt = 0; cnt < num_methods; cnt++) {
    method_index[cnt] = -1;
    code_start[cnt] = -1;
    code_length[cnt] = -1;
    // For each method determine the index of its name and locate its code array
    for (int k=0; k<num_methods; k++) {
    fpointer += 2;
    victim.seek(fpointer);
    method_index[k] = victim.readUnsignedShort();
    fpointer += 4;
    victim.seek(fpointer);
    // Determine the number of attributes for the method
    num_m_attributes = victim.readUnsignedShort();
    fpointer += 2;
    // Test each attribute to see if it's code
    for (int m=0; m<num_m_attributes; m++) {
    int Code_test = victim.readUnsignedShort();
    fpointer += 2;
    // If it is, record the location and length of the code array
    if (Code_test == Code_entry){
    int att_length = victim.readInt();
    int next_method = fpointer + att_length + 4;
    fpointer += 8;
    victim.seek(fpointer);
    code_length[k] = victim.readInt();
    code_start[k] = fpointer + 5;
    fpointer = next_method;
    victim.seek(fpointer);
    // Otherwise just skip it and go on to the next method
    else {
    fpointer = fpointer + victim.readInt() + 4;
    victim.seek(fpointer);
    // Print the information about the Constant Pool
    System.out.println("There are " + (cp_entries - 1) + " + 1 entries in the Constant Pool:\n");
    System.out.println("Index\t" + "Tag\t" + "Reference(s)/Value(s)\t");
    System.out.println("-----\t" + "---\t" + "---------------------\t");
    for (int i = 0; i < cp_entries; i++) {
    switch (tags[i]) {
    case 1: System.out.println(i + "\t" + tags[i] + "\t" + read_strings[i].toString());
    break;
    case 3: System.out.println(i + "\t" + tags[i] + "\t" + read_ints1[i]);
    break;
    case 4: System.out.println(i + "\t" + tags[i] + "\t" + read_floats[i]);
    break;
    case 5: System.out.println(i + "\t" + tags[i] + "\t" + read_longs[i]);
    break;
    case 6: System.out.println(i + "\t" + tags[i] + "\t" + read_doubles[i]);
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