Is the ebook "Head First Design Patterns" in a good quality or just a scanned version of the normal book?
Thank you very much
Mohamed El Sayed
Head First books are all available as full-featured PDFs, so you can search, copy text, etc.
If you'd like to see what the PDF looks like, you can download a sample chapter (ch. 3) at http://www.oreilly.com/catalog/hfdesignpat/chapter/ch03.pdf.
Let us know if you have any more questions.