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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:How do you get DNF crystal fragments? At present, a new NPC suspicious old man has been added to the west coast of the experience clothing. Players can exchange prop crystal fragments for practical props at the suspicious old man. What is the way to obtain DNF crystal fragments?笑いの天才 菊池桃子 相原　勇5. Different types of hit will consume other types of inductance times, and different types of inductance times have no influence on each other.秦淼一边叹气抱怨，一边不耐烦地将糙米饭拨一半给板栗。1 In case of failure on the expressway, the warning sign shall be set 150 meters away from the rear of the vehicle.Obviously, EventHandler is the delegate. Now use EventHandler to execute multiple methods.