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The list.toArray idiom you employ here is not parametrized by an array of your List's parametrized type, so it returns Object[]. For instance, with your List<String> str, you can invoke: String[] foo = str.toArray(new String[str.size()]); without casting. The problem here is that, due to Java generics' design, you can never initialize a new E[], hence you have to cast to (E[]). I cannot see this throwing a ClassCastException ever as is.
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