ABAP Book : which one to choose.
I have few years of experience in Java Programming. Now would like to learn ABAP.
I checked the bookstore.. and found below two books:
1. "ABAP Objects: ABAP Programming in SAP NetWeaver" by Horst Keller, Sascha Kruger
2. "Sams Teach Yourself ABAP/4 in 21 Days" by Ken Greenwood
Which one i can choose out of those.. or is there any better recommended book other than the above ones.