Vincent Hennebert wrote: > Hi, > > Manuel Mall a écrit : >> On Wednesday 18 July 2007 02:58, Andreas L Delmelle wrote: > <snip/> >> Interestingly Java 1.5 has added the Integer.valueOf(int) method with >> the following comment: > > Flyweight pattern. That's what I was looking for before replying to > Andreas' commit, and I was surprised to not find it in the 1.4 standard > library. A good thing it finally got added. > > >> Returns a Integer instance representing the specified int value. If a >> new Integer instance is not required, this method should generally be >> used in preference to the constructor Integer(int), as this method is >> likely to yield significantly better space and time performance by >> caching frequently requested values. >> >> Obviously we can't use it because of backwards compatibility with 1.4 >> but it seems to address, to some extent, the performance issue you >> tried to solve. > > Indeed. And with the auto-boxing of primitive types we wouldn't even see > those ugly new Integer(...) anymore. And guess what? The compiler makes > use of Integer.valueOf() for auto-boxing. > > Shall we launch a poll on fop-user about abandoning support for 1.4 and > require 1.5 as a minimum? :-]
Ho, ho. alt-design always cached _all_ the Integer instances it needed. Another startling new idea. As Manuel points out, unnecessary in 1.5+, unless you are using a lot of Integers outside the range -128<=x<=127 -- Peter B. West <http://cv.pbw.id.au/> Folio <http://defoe.sourceforge.net/folio/>
