Figure 7-3. Per-class life cycle of advice
Now let's say we want to mix an introduction into all instances of Contact class, and the
introduction will carry information for each Contact instance (e.g., an attribute isModified that indicates
whether the specific instance was modified). In this case, the introduction will be created for each
instance of Contact class and tied to that specific instance, as shown in Figure 7-4.
Figure 7-4. Per-instance introduction
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