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Let me explain the role of these classes: MySubject class is our main object, Observer1 and Observer2 are objects that depend on MySubject, and Observer1 and Observer2 must change when MySubject changes. The AbstractSubject class defines a list of objects to be monitored, which can be modified: add or delete monitored objects, and when MySubject changes, it is responsible for notifying the objects that exist in the list. Let's look at the implementation code:After hearing these words, I briefly summarized and recorded the characteristics of two different "living biological weapons" on position 169 and position 142 in the interview notebook and compared them:Focus 1. Level 2 is calculated only on the basis of Level 1Application Scenario 4: Intelligent Guidance refers to the proxy handling other things when calling real objects. For example, when calculating the number of real object references and accessing a century-old object, check whether it has been locked to ensure that other objects cannot change it. They attach some housekeeping when accessing an object through the proxy.如此，我们才能站在优势方面，处理问题就更加方便了。