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affordable private java servlets affordable private java servlets In particular, any two employees who were hired on the same date will compare as equal. When you're sorting a List, this doesn't matter; but when you're using the Comparator to order a sorted collection, it's fatal. If you use this Comparator to insert multiple employees hired on the same date into a TreeSet, only the first one will be added to the set; the second will be seen as a duplicate element and will be ignored. To fix this problem, simply tweak the Comparator so that it produces an ordering that is compatible with equals. In other words, tweak it so that the only elements seen as equal when using compare are those that are also seen as equal when compared using equals.

affordable private java servlets The way to do this is to perform a two-part comparison (as for Name), where the first part is the one we're interested in — in this case, the hire date — and the second part is an attribute that uniquely identifies the object. Here the employee number is the obvious attribute. This is the Comparator that results. static final Comparator<Employee> SENIORITY_ORDER = new Comparator<Employee>() }; One last note: You might be tempted to replace the final return statement in the Comparator with the simpler: return e1.number() - e2.

affordable private java servlets number(); Don't do it unless you're absolutely sure no one will ever have a negative employee number! This trick does not work in general because the signed integer type is not big enough to represent the difference of two arbitrary signed integers. If i is a large positive integer and j is a large negative integer, i - j will overflow and will return a negative integer. The resulting comparator violates one of the four technical restrictions we keep talking about (transitivity) and produces horrible, subtle bugs. This is not a purely theoretical concern; people get burned by it. « Previous • Trail • Next » Problems with the examples? Try Compiling and Running the Examples: FAQs.

affordable private java servlets Complaints? Compliments? Suggestions? Give us your feedback. Copyright 1995-2007 Sun Microsystems, Inc. All rights reserved. Previous page: The Map Interface Next page: The SortedSet Interface The Queue Interface (The Java™ Tutorials > Collections > Interfaces) .FigureCaption #TopBar_bl #TopBar_br #TopBar_tl #TopBar_tr #TopBar @media print } #TopBar_right @media print } #TopBar_right a #TopBar a:visited, #TopBar a:link #TopBar a:hover, #TopBar a:active #BreadCrumbs #BreadCrumbs a #BreadCrumbs a:visited, #BreadCrumbs a:link #BreadCrumbs a:hover, #BreadCrumbs a:active #PageTitle .

affordable private java servlets

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affordable private java servlets