The creating subclass of an existing class different from copying the code from the existing class to a new file because one involves existing class while the other involves a new class.
This is known to be creating a class, instead of declaring completely new members, then a person often designate that the new class to inherit the members of an existing class - Uses Existing class.
In the creating a class, instead of declaring what we call a completely new members, a person can designate that the new class to be able to inherit the members of an existing class. Uses New class.
Hence, The creating subclass of an existing class different from copying the code from the existing class to a new file because one involves existing class while the other involves a new class.
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