Learn Java Programming - ArrayList addAll Method Tutorial
The addAll() method is very useful for appending and inserting various array lists into the current ArrayList instance. There are two overloaded versions of the addAll() method. The first version has only one parameter and it appends a Collection object to the end of the current ArrayList instance. The documentation syntax for the parameter list (Collection ? extends E c) may appear somewhat confusing. There are three parts to the documentation for this one single parameter. The first part is the class or interface - in this case the Collection interface - and the third part is the local parameter variable which will always be a reference variable in this case. Let's simplify things with a simple comparison,
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