If that test fails, it delegates to the parent method using the parent keyword.
如果该测试失败,则它使用parent关键字指派给父方法。
An instance of this class has to be created for each time the parent method is called.
当每次调用匿名类的父方法时都必须创建一个该类实例。
Notice that the processTradeUpdates() method updates only the entities that are modified or created in the parent method (or above).
注意,processTradeUpdates() 方法仅更新在父方法(或以上)中修改中创建的实体。
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