In general, the super keyword can be used to call overridden methods, access hidden fields or invoke a superclass's constructor. When i try to run it as at the end of the file i get this stacktrace 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. 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 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). 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 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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