將迭代器轉換為流

使用 Spliterators.spliterator() 或 Spliterators.spliteratorUnknownSize() 將迭代器轉換為流：

Iterator<String> iterator = Arrays.asList("A", "B", "C").iterator();    
Spliterator<String> spliterator = Spliterators.spliteratorUnknownSize(iterator, 0);
Stream<String> stream = StreamSupport.stream(spliterator, false);