Global Class : Inheritance

Ex :-

Steps :-

• Go to Transaction code SE24.

• Enter the Class name which start's with ZCL_< class name > and click on Create.

• Pop-up will appear.
• Enter the Description.
• Un-check the Final.
• Click on SAVE.

• Assign the Package.

• Enter the Method name , Level , Visibility and Description.

• Place the cursor on Method name and click on Parameters to assign parameters.

• Pass the importing , exporting , changing parameters.

• Click on Methods.

• Double click on Method name.

• Enter the logic.

• Click on Save.
• Click on Back.

• Create one more method to display data.

• Place the cursor on method name and click on Parameters.

• Pass the parameters and press Enter.

• Click on Methods.

• Double click on Method name.

• Pop-up will appear.
• Click on Yes.

• Enter the Logic.

• Click and SAVE and Back.

• Save -> Check -> Activate.

• Copy the parent Class name.
• Click on Back button.

Class Inheritance Steps :-

• Enter the Class name which start's with ZCL_< class name > and click on Create.

• Enter the short description.

• Click on Create Inheritance.

• Enter the Super Class name.

• Click on Save Button.
• Save it in either Local Package or Package.

• Child inherit's properties of Parent Class.

To Re-define the Method

• Select method which to be re-define and click on Redefine.

• Look like,

• Enable Super Class method.

• Pass the parameters and redefine the inherited super class method.

• Logic.

CALL METHOD SUPER->FETCH_DATA_VBAP

  EXPORTING

    IM_VBELN =  IM_VBELN

  CHANGING

    CH_ITAB  = CH_ITAB

    .

DATA : IT_VBAK TYPE TABLE OF VBAK,

       WA_VBAK TYPE VBAK.

SELECT * FROM VBAK INTO TABLE IT_VBAK FOR ALL ENTRIES IN CH_ITAB

  WHERE VBELN = CH_ITAB-VBELN.

LOOP AT IT_VBAK INTO WA_VBAK.

WRITE : / WA_VBAK-VBELN , WA_VBAK-VKORG , WA_VBAK-KUNNR , WA_VBAK-ERDAT.

ENDLOOP.

• Click on Save .
• Click on Back.
• Save -> Check -> Activate.

• Copy the Child class name.

Main Program :-

• Go to Transaction Code SE38.

• Enter the program name which start's with Y or Z < program name > and click on Create.

• Pop-up will appear.
• Enter the Title.
• Select the Attribute Type as Executable Program.
• Click on SAVE.

• Source Code

DATA : OBJ TYPE REF TO ZCL_CHILD_CLASS.

DATA : IT_VBAP TYPE TABLE OF  VBAP.

PARAMETERS : P_VBELN TYPE VBAP-VBELN.

START-OF-SELECTION.

CREATE OBJECT OBJ.

CALL METHOD OBJ->FETCH_DATA_VBAP

  EXPORTING

    IM_VBELN =  P_VBELN

  CHANGING

    CH_ITAB  =  IT_VBAP

    .

ULINE.

CALL METHOD OBJ->DISPLAY_VBAP

  EXPORTING

    IM_ITAB = IT_VBAP

    .

• Save -> Check -> Activate.
• Execute ( F8 ).

Input

• Enter the Input.

Output

• Click on Execute.