Groups > comp.lang.java.programmer > #6719

Re: looping through a list, starting at 1

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From	Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at>
Subject	Re: looping through a list, starting at 1
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Stefan Ram <ram@zedat.fu-berlin.de> wrote:
>   Assuming a list has a sufficient number of entries at run
>   time, what should be prefered to assign a reference to each
>   entry to »e«, starting at index 1:

> for( final E e : l.sublist( 1, l.size() ))...
This appears to be the most elegant and general approach.

> for( int i = 1; i < l.size(); ++i ){ final E e = l.get( 0 ); ... }
for an ArrayList-like implementation, this one may perform well,
while for a LinkedList-alike it will scale rather bad for large lists.

Another option would be to get an iterator from your list, pre-advance
it once, then use a while-loop on it.hasNext() ...
   Iterator<E> it = l.iterator();
   it.next(); // skip first (assuming a list has ...)
   while (it.hasNext()) {
      final E e = it.next();
      ...
   }

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Re: looping through a list, starting at 1 Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-08-01 23:21 +0000

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