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Last week we began discussing generics and relationships in Java. This week, we'll learn about parameter type limitations, bounds, wildcards, and more. This article, the third in a series, was excerpted from chapter eight of the book Learning Java, third edition, written by Patrick Niemeyer and Jonathan Knudsen (O'Reilly; ISBN: 0596008732). Copyright © 2006 O'Reilly Media, Inc. All rights reserved. Used with permission from the publisher. Available from booksellers or direct from O'Reilly Media.