Observer

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Summary:
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Field |
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Method

Detail:
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All Known Implementing Classes:

Quackologist
```
public interface Observer
```

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method and Description
  
  void update(QuackObservable duck)

- Method Detail
  - update
```
void update(QuackObservable duck)
```

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Detail:
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