Can you write a foreach loop like this?
in [Java Programming]
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From: Daniel Pitts on 1 Dec 2009 23:46 Kevin McMurtrie wrote: > In article <vdfRm.35142$cd7.18472(a)newsfe04.iad>, > Daniel Pitts <newsgroup.spamfilter(a)virtualinfinity.net> wrote: > >> Kevin McMurtrie wrote: >>> In article <7nkah7F3luvvkU1(a)mid.individual.net>, >>> Fencer <no.i.dont(a)want.mail.from.spammers.com> wrote: >>> >>>> Say I have a List<SomeClass> and now I want to loop through the list but >>>> I am only interested in the String representation of the SomeClass objects. >>>> >>>> Do I have to do it like this: >>>> >>>> for (SomeClass inst : aListOfSomeClass) { >>>> String str = inst.toString(); >>>> // Do something with str >>>> } >>>> >>>> ? >>>> >>>> I don't really care about each instance objecct here, just the string >>>> represenation of each instance, so is it possible to do something like >>>> the following non-valid code (and here I imagine toString() being called >>>> on each element): >>>> >>>> for (String str : aListOfSomeClass.toString()) { >>>> // Do something with str >>>> } >>>> >>>> Hope I made sense, thanks! >>>> >>>> - Fencer >>> Java always has a hard way :) >>> >>> >>> public class StringItr implements Iterable<String> >>> { >>> final Iterable m_target; >> This should be an Iterable<?> > > It should have array support, JavaDocs, and proper spacing too but it's > just free info on Usenet. I leave it to the viewer to add the finishing > touches. > > [snip] Finishing touches are one thing, broken code is another ;-). I would advocate a different approach, which is basically a library for providing an equivalent functionality to mapcar. -- Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/>
From: Arved Sandstrom on 2 Dec 2009 05:20
Daniel Pitts wrote: [ SNIP ] > Finishing touches are one thing, broken code is another ;-). > I would advocate a different approach, which is basically a library for > providing an equivalent functionality to mapcar. > If and when Java gets lambdas I'd just make "map" a method in Collection. AHS |