O'Reilly logo

Java™ Design Patterns: A Tutorial by James W. Cooper

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 23. The State Pattern

The State pattern allows you to have an object represent the state of your application and to switch application states by switching objects. For example, you can have an enclosing class switch between a number of related contained classes and pass method calls on to the current contained class. Design Patterns suggests that the State pattern switches between internal classes in such a way that the enclosing object appears to change its class. In Java, at least, this is a bit of an exaggeration, but the actual purpose to which the classes are put can change significantly.

Many programmers havwe had the experience of creating a class that performs slightly different computations or displays different information based ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required