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Super() is a special use of the super keyword where you call a parameterless parent constructor Now i want to test the childrunner() method of childclass and since this method internally calls the super class method, i need some help/piece of code on how to mock the run() method which is present in superclass. In general, the super keyword can be used to call overridden methods, access hidden fields or invoke a superclass's constructor.

Super() lets you avoid referring to the base class explicitly, which can be nice 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. 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 to add super privileges to mysql database Asked 13 years, 2 months ago modified 1 year, 3 months ago viewed 409k times

If you add any other column/attribute to a primary key then it become a super key, like employeeid + fullname is a super key

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