Sun Certified Java Programmer<br />Sun Certified Web Component Developer
posted 15 years ago
Hi, Xiuyuan, the method <code> public static List unmodifiableList(List list) Returns an unmodifiable view of the specified list. This method allows modules to provide users with "read-only" access to internal lists. Query operations on the returned list "read through" to the specified list, and attempts to modify the returned list, whether direct or via its iterator, result in an UnsupportedOperationException. </code> Since you only modify the original list, so there is no UnsupportedOperatonException. If you try to modify the returned list, the exception will be thrown. Hope it helps,
------------------ Guoqiao Sun Sun Certified Programmer for Java 2 Platform try my mock exam¹² at my homepage.
Guoqiao Sun<br />SCJP2 SCWCD2<br />Creator of <a href="http://www.jiris.com/" target="_blank" rel="nofollow">www.jiris.com</a>, Java resource, mock exam, forum
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