先调用父类的构造方法 super init
通过调用父类的方法来访问参数值。
Parameter values are accessed by calling a super class method.
如果我们没有调用父类的实现，那么就不会检查所分析的方法。
If we didn't call the superclass 'implementation, then the analyzed method would never be examined.
当每次调用匿名类的父方法时都必须创建一个该类实例。
An instance of this class has to be created for each time the parent method is called.
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