If you check Sun's
SCJP objectives (for version 1.5), you will see that:
API Contents is objectives section 3OO Concepts is objectives section 5Fundamentals is objectives section 7In K&B, coverage of these objectives might be spread out among multiple chapters, but the table of contents identifies which objectives are covered under which topics. So look in the K&B table of contents for "Exam Objectives 3.x, 5.x, and 7.x."