In general, the super keyword can be used to call overridden methods, access hidden fields or invoke a superclass's constructor. Asked 13 years, 2 months ago modified 1 year, 3 months ago viewed 409k times Super() lets you avoid referring to the base class explicitly, which can be nice
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But the main advantage comes with multiple inheritance, where all sorts of fun stuff can happen.
The one with super has greater flexibility
The call chain for the methods can be intercepted and functionality injected. In fact, multiple inheritance is the only case where super() is of any use I would not recommend using it with classes using linear inheritance, where it's just useless overhead. As for chaining super::super, as i mentionned in the question, i have still to find an interesting use to that
For now, i only see it as a hack, but it was worth mentioning, if only for the differences with java (where you can't chain super). I'm currently learning about class inheritance in my java course and i don't understand when to use the super() call I found this example of code where super.variable is used Super e>) says that it's some type which is an ancestor (superclass) of e
Extends e>) says that it's some type which is a subclass of e
(in both cases e itself is okay.) so the constructor uses the Extends e form so it guarantees that when it fetches values from the collection, they will all be e or some subclass (i.e How do i call the parent function from a derived class using c++ For example, i have a class called parent, and a class called child which is derived from parent
Within each class there is a print If you add any other column/attribute to a primary key then it become a super key, like employeeid + fullname is a super key If a table don't have any individual columns that qualifies for a candidate key, then you have to select 2 or more columns to make a row unique. The automatic insertion of super () by the compiler allows this
Enforcing super to appear first, enforces that constructor bodies are executed in the correct order which would be
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