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low cost web hosting solution The compiler can only guarantee that an Object will be returned by the iterator. To ensure the assignment to a variable of type Integer is type safe, the cast is required. Of course, the cast not only introduces clutter. It also introduces the possibility of a run time error, since the programmer may be mistaken. What if programmers could actually express their intent, and mark a list as being restricted to contain a particular data type? This is the core idea behind generics.
low cost web hosting solution Here is a version of the program fragment given above using generics: List<Integer> myIntList = new LinkedList<Integer>(); // 1' myIntList.add(new Integer(0)); // 2' Integer x = myIntList.iterator().next(); // 3' Notice the type declaration for the variable myIntList. It specifies that this is not just an arbitrary List, but a List of Integer, written List<Integer>.
low cost web hosting solution We say that List is a generic interface that takes a type parameter--in this case, Integer. We also specify a type parameter when creating the list object. Note, too, that the cast on line 3' is gone. Now, you might think that all we've accomplished is to move the clutter around. Instead of a cast to Integer on line 3, we have Integer as a type parameter on line 1'.
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