As the title states, why can't Java generics be used for static methods? 
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1 Answer
<T> is the generic type of the class. You cannot refer to it from a static context, since each instance of the class may have a different T (similar to why you can't reference instance members from static methods). You could, however, give the method itself a generic type:
public static <S> S test (S s) { // code... }