Code idiom: inserting a separator between the elements in a list

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I use the following code idiom all the time. I know it seems simple, and I know there are other ways of doing it, but when I first saw it a penny dropped. Writer out = ...; List l = ...; String sep = ''; for (Iterator i = l.iterator(); i.hasNext(); ) { String s = (String) i.next(); out.write(sep); out.write(s); sep = ','; } You can see how this works:

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