Why do I have to call the construction method of the parent class before the constructor of the subclass is run? Can you turn around? Why can't it be reversed?

Source: Internet
Author: User
    The constructor (constructor) is a special method. It is used primarily to initialize an object when it is created, to assign an initial value to an object member variable, and to always use the new operator in the statement that creates the object. A particular class can have more than one constructor, which is an overload of the constructor, depending on the number of arguments or different types of arguments. The function of a constructor is primarily used to define the state of the initialization when the class's object is created.
So the function of the constructor is simply to initialize and initialize a new object.

Why do I have to call the construction method of the parent class before the constructor of the subclass is run? Can you turn around? Why can't it be reversed?

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