The BlueJ development environment was specifically designed to support introductory teaching of object-orientations and helps users grasp the complicated concepts of class structure. Unlike most books on the subject, this text uses BlueJ to get readers started on object-oriented programming from day one. Uses a spiral approach that introduces a topic in a simple context early on, then revisits it later to increase understanding; Offers an abundance of projects for hands-on practice; Chapters are ordered around software development concepts rather than language features; Language-feature introduction is naturally driven by problems to be solved; Chapters are based around distinct projects for more variety; Does not cover traditional topics like control structures. A useful reference for programmers.