topic Re: Help with OO program in Application Development and Automation Discussions

Help with OO program

Former Member — Sun, 30 Apr 2006 12:29:36 GMT

Hello. I have a base class called Property. It gets data from the program in the form of a parameter p_data. There are 2 methods getdata(gets p_data from the program) and display_area(calculate and print the area)

I have two subclasses called FootballPitch and RaceTrack which are inheriting from Property. There are two methods: Pitch_area(calculate the area using p_data) and display_pitch(this redefines display_area in the super class).

The second subclass will work in a similar way. I am new to classes in ABAP so I need some assistance. Thank you.

James

Re: Help with OO program

Former Member — Sun, 30 Apr 2006 12:59:47 GMT

Hi James,

Welcome to SDN!!

Can u tell us in what way would u need assistance..

If syntax is the problem...

refer

https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/2503f09c-0801-0010-dc89-80bab376e4b8

This shall help u solve your problem and is excellent tutorial for freshers.

Was of great help to me too.

Hope that helps!!

Let me know your email id and i shall mail the documents to you alonf with some good documents

Regards,

Tanveer.

Please mark answers by clicking on the star at the top

Re: Help with OO program

Former Member — Sun, 30 Apr 2006 15:12:01 GMT

I would like to know how to use pitch_area to redefine display_area. What will the method look like? It seems to me that pitch_area is not needed.

James

Re: Help with OO program

Former Member — Sun, 30 Apr 2006 17:48:49 GMT

Hi James,

Well, you understood that nicely.See the only important thing to do is to redefine the display_area method.Here u CANNOT CHANGE THE METHOD INTERFACE, whereas you are free to change code according to your need.

Hope this helps.

best regards,

Bharat

Re: Help with OO program

Former Member — Sun, 30 Apr 2006 20:28:26 GMT

Hello James,

You have got it right!!

Both the methods pitch_area and display_area i suppose do the calculation of area based on parameter p_data.

So you need not override (what u termed as redefine) the method display_area.

Also a method pitch_area cannot override display_area.

It need to be so same interface.

For example,

if u declare your display_area method as follows in base class Property :

method display_area .

area = p_data * p_data.

endmethod.

Now if u use this method in the child class FootballPitch,

it will do the same work of finding area..

U can overide it here..

method display_area .

area = 2 * p_data * p_data.

endmethod.

Now when u use this method, it will give u 2 times the area .

However, for class RaceTrack,

the method display_area would still give u the area..

Hope that explains th point..

Shall mail u documents on this topic once i get back to office on tuesday...

Regards,

Tanveer.

Note: Please mark helpful answers on SDN as thats the only way to appreciate someones efforts..

Re: Help with OO program

Former Member — Mon, 01 May 2006 23:46:53 GMT

I used redefined the original method in the subclasses. Pitch_area was not necessary as I thought.

Thank you all for the help. However, I don't see the radio buttons to award the points to you for helping me.

James