The decorator stores the pushed back elements in a LIFO manner: the last element that has been pushed back, will be returned as the next element in a call to {@link #next()}.
The decorator does not support the removal operation. Any call to {@link #remove()} willresult in an {@link UnsupportedOperationException}. @since 4.0 @version $Id: PushbackIterator.java 1479763 2013-05-07 05:28:39Z tn $
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