Ruby's super syntax is really flexible.

Unlike Java, super in Ruby replaces not the parent class, but the method with the same name as the current method in the parent class. In Ruby, super is used flexibly. When super is used, without any parameters (and no parentheses), the actual function is to automatically call the current method in the parent class and pass the current parameter over, that is
Super. Thismethod (param1, param2. ..) can be simplified to a super in ruby, which is very convenient.

Example

Class A <string
Def to_s
Super + "__"
End
End

A = A. New ('OK ')
P a. to_s

If the parameters of the method in the parent class are different from those in the subclass class, you must explicitly call the input parameters.

Note: Super. somemethod syntax is not available in ruby, because Super is already the parent class method, so when using super, if the current method is added, therefore, super commands cannot be used. use self instead (the parent class method is directly inherited to self)
 

Class B <string
Def to_s
Super + "__"
End
Def newmethod # New Method
Self + "__"
End
End

In addition, the super command ignores method access control. That is to say, super can directly call the private method in the parent class. It seems a little flexible.