you can start study OO like this

If you are new to object-orientation, you should read Scott Ambler’s ‘The Object Primer’ and then acquire some practical experience of your own. You should definitely use the CRC techniques described by Ambler and Fowler for object-oriented analysis and design. After this, you should learn UML, since this is the universal OO analysis and design notation. Finally, you should read at least one book about patterns.

At the beginning of a large OO project, the question immediately arises as to the sequence in which things should be done, which phases should be finished at what time, how to divide up and organize the development work, how to minimize risks, how to assemble a good team, and so on and so forth. Many of the best practices of project management have had to be redefined for the object-oriented world, and the opportunities that this has produced are significant. For further information about how to use OO in project management, see Grady Brooch’s book ‘Object solutions’, or the chapter entitles ‘An outline development process’ from Martin Fowler’s book.