October 2004
Intermediate to advanced
692 pages
15h 18m
English
Content preview from Head First Design Patterns
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Chapter 2. The Observer Pattern: Keeping your Objects in the know
Don’t miss out when something interesting happens! We’ve got a pattern that keeps your objects in the know when something they might care about happens. Objects can even decide at runtime whether they want to be kept informed. The Observer Pattern is one of the most heavily used patterns in the JDK, and it’s incredibly useful. Before we’re done, we’ll also look at one-to-many relationships and loose coupling (yeah, that’s right, we said coupling). With Observer, you’ll be the life of the Patterns Party.
Congratulations!
Your team has just won the contract to build Weather-O-Rama, Inc.’s next-generation, Internet-based Weather Monitoring Station.
|
Statement of Work |
Congratulations on being selected to build our next-generation, Internet-based Weather Monitoring Station! |
The weather station will be based on our patent pending WeatherData object, which tracks current weather conditions (temperature, humidity, and barometric pressure). We’d like you to create an application that initially provides three display elements: current conditions, weather statistics, and a simple forecast, all updated in real time as the WeatherData object acquires the most recent measurements. |
Further, this is an expandable weather station. Weather-ORama ... |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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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.