Cocoa is one of the principal application environments for Macr OS X. Among Cocoa's many attributes, its advanced object-oriented APIs allow you to develop in both Java and Objective-C. This new way of developing sophisticated applications for the Macintosh is both powerful and easy. This text describes Cocoa application development, using Objective C. It begins with a discussion of essential object-oriented programming concepts for those with no previous experience. It proceeds through an introduction to the Cocoa environment, development, tools, and some simple tutorials to help you become familiar with the basic elements of Cocoa programming. The remaining tutorials guide you as you create a series of increasingly complex example applications. The techniques and concepts you learn in one tutorial lay the foundation for the more advanced techniques and concepts in the next. You don't need extensive programming experience to complete the examples in this book, though it would be helpful to have some experience with the C programming language. The code for each example is included in the text so you can simply type it in. If you're already familiar with an object-oriented programming language like Java or Smalltalk, you should quickly feel at home with Objective-C, the language used throughout this book.