方法參數傳遞:?
REPORT z_mehtod_para.
*---------------------------------------------------------------------*
*??????? CLASS vehicle DEFINITION
*---------------------------------------------------------------------*
*??????? ........?????????????????????????????????????????????????????? *
*---------------------------------------------------------------------*
CLASS vehicle DEFINITION.
?? PUBLIC SECTION.
???? METHODS: accelerate IMPORTING rate TYPE i,
????????????? show_speed.
?? PRIVATE SECTION.
???? DATA speed TYPE i VALUE 0.
ENDCLASS.
*---------------------------------------------------------------------*
*??????? CLASS vehicle IMPLEMENTATION
*---------------------------------------------------------------------*
*??????? ........?????????????????????????????????????????????????????? *
*---------------------------------------------------------------------*
CLASS vehicle IMPLEMENTATION.
?? METHOD accelerate.
???? speed = speed + rate.
?? ENDMETHOD.
?? METHOD show_speed.
???? WRITE: / 'Speed:',speed.
?? ENDMETHOD.
ENDCLASS.

DATA o_vehicle TYPE REF TO vehicle.

START-OF-SELECTION.
?? CREATE OBJECT o_vehicle.
?? CALL METHOD o_vehicle->accelerate EXPORTING rate = 2.
?? CALL METHOD o_vehicle->accelerate EXPORTING rate = 2.
?? CALL METHOD o_vehicle->show_speed.
該示例輸出如下:?
???? 4
方法還可以進行動態調用,即通過變量對方法進行指定,例如下列語句
?? meth = acclerate.
?? call method o_vehicle->(meth).

函數方法:?
REPORT z_funtional_method.

*---------------------------------------------------------------------*
*??????? CLASS circle DEFINITION
*---------------------------------------------------------------------*
*??????? ........?????????????????????????????????????????????????????? *
*---------------------------------------------------------------------*
CLASS circle DEFINITION.
?? PUBLIC SECTION.
???? METHODS get_area IMPORTING value(i_radius) TYPE i
????????????????????? RETURNING value(r_size)??? TYPE f.
?? PRIVATE SECTION.
???? CONSTANTS pi TYPE f VALUE '3.14159265'.
ENDCLASS.
*---------------------------------------------------------------------*
*??????? CLASS circle IMPLEMENTATION
*---------------------------------------------------------------------*
*??????? ........?????????????????????????????????????????????????????? *
*---------------------------------------------------------------------*
CLASS circle IMPLEMENTATION.
?? METHOD get_area.
???? r_size = i_radius ** 2 * pi.
?? ENDMETHOD.
ENDCLASS.

PARAMETERS radius TYPE i.
DATA: o_circle TYPE REF TO circle,
?????? area TYPE f.

START-OF-SELECTION.
?? CREATE OBJECT o_circle.
?? CALL METHOD o_circle->get_area
?????????????? EXPORTING i_radius = radius
?????????????? RECEIVING r_size = area.
?? WRITE: / area.
?? area = o_circle->get_area( radius ).
?? WRITE: / area.

構造方法和析構方法
1. 構造方法
??? 構造方法是運行時環境自動調用的一種方法,用于為對象設定一個初始化狀態,不能在程序運行過程中由程序代碼調用.與其他方法類似構造方法也存在靜態和實例兩種形式.構造方法不一定需要在類中定

義,系統通常會自動生成一個默認的構造方法,將對象狀態設置為初始值.
構造方法中不包含任何形式的輸出參數,其功能只是定義對象狀態,而不是對其進行改變.構造方法在create object語句中被調用,因此根據實例構造方法的定義,該語句本身也可以包含輸出參數exporting和

返回值exception選項.如果在對象創建過程中出現異常,則對象被刪除,引用變量設為初始值.
???? 類構造方法屬于靜態方法,只能在程序中被調用一次,即第一次使用該類時調用,該方法也必須在公有部分聲明,其名稱必須為class_constructor.
???? class-methods class_constructor.
???? 類構造方法不包含接口,而且在其中只能訪問類的靜態屬性.
構造方法:?
REPORT z_method_constructor.
*---------------------------------------------------------------------*
*??????? CLASS vehicle DEFINITION
*---------------------------------------------------------------------*
*??????? ........?????????????????????????????????????????????????????? *
*---------------------------------------------------------------------*
CLASS vehicle DEFINITION.
?? PUBLIC SECTION.
???? METHODS: accelerate IMPORTING rate TYPE i,
????????????? constructor IMPORTING i_speed TYPE i,
????????????? show_speed.
?? PRIVATE SECTION.
???? DATA speed TYPE i VALUE 0.
ENDCLASS.
*---------------------------------------------------------------------*
*??????? CLASS vehicle IMPLEMENTATION
*---------------------------------------------------------------------*
*??????? ........?????????????????????????????????????????????????????? *
*---------------------------------------------------------------------*
CLASS vehicle IMPLEMENTATION.
?? METHOD accelerate.
???? speed = speed + rate.
?? ENDMETHOD.
?? METHOD show_speed.
???? WRITE speed.
?? ENDMETHOD.
?? METHOD constructor.
???? speed = i_speed.
?? ENDMETHOD.
ENDCLASS.

DATA o_vehicle TYPE REF TO vehicle.

START-OF-SELECTION.
?? CREATE OBJECT o_vehicle EXPORTING i_speed = 4.
?? CALL METHOD o_vehicle->accelerate EXPORTING rate = 2.
?? CALL METHOD o_vehicle->accelerate EXPORTING rate = 2.
?? CALL METHOD o_vehicle->show_speed.
該示例輸出如下:?
????? 8
在對象創建過程中,通過構造方法傳遞了一個速度初始值作為其初始狀態.
2. 析構方法
??? 在某些面向對象語言中還存在析構方法的概念,該方法在對象刪除過程中被調用,目前ABAP對象中尚未提供該方法的實現形式.

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