March 2002
Intermediate to advanced
496 pages
8h 51m
English
Content preview from Design Patterns Java™ Workbook
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Making States Constant
Suppose that you decide to move the state constants to a DoorConstants interface. For this approach to work, you have to eliminate the Door instance variable from the DoorState class. You can drop this variable by changing the click(), complete(), and timeout() transition methods in the DoorState class to require a Door object as an input parameter. In this design, a Door object that receives, for example, a click() method from the carousel forwards this call as state.click(this).
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.