Use Interface of Class object

Hi Experts,
I want to use Interface of Class object. But I'dont know how I use it (declaration,call,create etc.)
There are a lot of exam about using local interface. But I need from Global object.
Class : CL_TPDA_DIFF_STRUC
Interface: IF_TPDA_DIFF_SERVICE
Best regards.

Firstly ; Your advice book tells the "General OO".
But I need "Only ABAP OO". The basic logic is the same. But syntax are different.
If there is a book about ABAP OO and syntax You can advice to me.
Secondly;
My code is below.
I created my interface success . But It give error at runtime. Error mesaage : 'Error during interprocess communication; Debugger will be closed . Message Number TPDA151'
DATA l_ref_diff TYPE REF TO CL_TPDA_DIFF_STRUC.
data : xyz TYPE REF TO IF_TPDA_DIFF_SERVICE.
data : p_var1 type TPDA_VAR_NAME,
          p_var2 type TPDA_VAR_NAME,
          lv_x type TPDA_DIFF_ATTR.
data : l_it_value_diff TYPE TPDA_DIFF_VALUE_DIFF_IT,
          l_it_main_diff TYPE tpda_diff_main_diffs_it.
p_var1 = 'CLIENTDATA1'.
p_var2 = 'CLIENTDATA2'.
lv_x-maxhits = 100.
CREATE OBJECT l_ref_diff.
xyz ?= l_ref_diff.
xyz->init( ).
xyz->DIFF( EXPORTING p_var1 = p_var1
                     p_var2 = p_var2
                     p_diff_attr = lv_x
           CHANGING p_it_value_diff_it = l_it_value_diff
                    p_it_main_diff_it = l_it_main_diff ).
Best Regards.

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hi all!
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Hmm... First, I'm sorry about my English... but i will try.
In C++ we can use multi-inheritance that let the developer "extends" one or more classes.
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Answer: That may be true if I want them to have a method. But how can I refer to them.
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hi,
what is the use of interface in class? can have a simple example with explanation? i have read from help but not quite understand its purpose.
thanks

Hi El,
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