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low cost web hosting solution low cost web hosting solution Fooblibar.widgets.*;public class Blade implements Part public class Guillotine implements Part public class Main } When we call addAssembly, it expects the second parameter to be of type Collection. The actual argument is of type Collection<Part>. This works, but why? After all, most collections don't contain Part objects, and so in general, the compiler has no way of knowing what kind of collection the type Collection refers to.

low cost web hosting solution In proper generic code, Collection would always be accompanied by a type parameter. When a generic type like Collection is used without a type parameter, it's called a raw type. Most people's first instinct is that Collection really means Collection<Object>. However, as we saw earlier, it isn't safe to pass a Collection<Part> in a place where a Collection<Object> is required. It's more accurate to say that the type Collection denotes a collection of some unknown type, just like Collection<?>.

low cost web hosting solution But wait, that can't be right either! Consider the call to getParts(), which returns a Collection. This is then assigned to k, which is a Collection<Part>. If the result of the call is a Collection<?>, the assignment would be an error. In reality, the assignment is legal, but it generates an unchecked warning. The warning is needed, because the fact is that the compiler can't guarantee its correctness.

low cost web hosting solution We have no way of checking the legacy code in getAssembly() to ensure that indeed the collection being returned is a collection of Parts. The type used in the code is Collection, and one could legally insert all kinds of objects into such a collection. So, shouldn't this be an error? Theoretically speaking, yes; but practically speaking, if generic code is going to call legacy code, this has to be allowed. It's up to you, the programmer, to satisfy yourself that in this case, the assignment is safe because the contract of getAssembly() says it returns a collection of Parts, even though the type signature doesn't show this. So raw types are very much like wildcard types, but they are not typechecked as stringently.

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