Question { 41102 }

what are ALV reports? how they are different from normal
reports? what are the main events that are used in an ALV
report? what is the use of SLIS type pool in alv reports?

Answer

ALV IS ABAP LIST VIEWER .IF OUTPUT IS MORE THAN 255
CHARACTERS WE CAN CHOOSE SELECETED COLUNS FROM OUTPUT REPORT
THIS IS MAIN DIFFERANCE.



THE FEATURES OF ALV ARE SORTING,FILTERING ,ETC....
TO AVOID CODING FOR PROCESSING LOGIC WE USE FUNCTION
MODULES IN ALV.

BY USING SLIS TYPE POOLS WE CAN USE REUSEEABLE DATA TYPES
IN FUNCTIONMODULES IN ALV REPORTS.

Question { CSC, 23012 }

What is up-casting and down casting? with example

Answer

When the level of hierarchies are considered, it is the super class at higher level & sub class at lower level. Hence the assignment of subclass to a superclass is up casting & super to a subclass is down casting.