Similarities and differences between constructors and member functions
1. External call angle
Construction Functions can only be called when the object is created;
Member functions can only be called after the object is created and can be repeated.
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2. Return value angle
The constructor does not need to return Value;
Member functions are optional.
3. Permission modifiers
The constructor can use any permission modifier;
The member function can also use any permission modifier.
4. Internal calls
The constructor can call member functions, but this member function is generally not treated as an object behavior;
Constructor function You can call the constructor, and this (parameter list) calls other constructors in the current class;
Constructors cannot call each other, it will recur infinitely and this(...) must be in the first sentence! Prevent value overwriting;
Member functions can call member functions, member functions cannot call constructors, but they can call new. (The constructor can have the same name as the member function!)
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