Ruby journey (5) Encapsulation

There are three types of modifying keywords for Ruby member access, which are the same as C.
1 private can only be the method called by this object
2 protected can only be called for this object and its sub-objects
3. Public allows any object to call methods.

Different from C #, the ruby access modifier starts to work from the definition and ends when the next access modifier appears, for example

Class Greeter
Def Initialize
End

Private
Def Sayhi ()
Puts " Hi "
End

Def Saybye ()
Puts " Bye "
End

Public
Def Say ()
Sayhi
Saybye
End

End

G = Greeter. New
G. Say # Output Hi Bye
G. sayhi # Error because the sayhi isn' t publics Member

Initialize is private by default. Other methods are public member variables and class variables are private by default. Use attr_reader or attr_accessor to increase read/write control.