1. instance parameters in subclass are all included in parent class.
instance parameters within subclass are included by parent class
2. how to invoke the parent class:
class and child class with a same method
1. instance parameters in subclass are all included in parent class.
instance parameters within subclass are included by parent class
2. how to invoke the parent class:
class and child class with a same method
本文标题：class and subclass
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