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Observer Pattern

Observer Pattern

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Observer Pattern

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  1. Observer Pattern

  2. Weather display application

  3. WeatherData Class

  4. First attempt!

  5. Issues in 1st attempt!

  6. Observer Pattern 

  7. Definition  Observer Pattern defines a one-to-many dependency between objects so that when one object change state, all of its dependents are notified updated automatically.

  8. Implementing Weather Station

  9. Implementing Subject Interface

  10. Building Display Elements

  11. Implementing Main Method

  12. Using Java Built-in Patterns

  13. Reworking CurrentConditionsDisplay