Re: Can you write a foreach loop like this?

From:

Kevin McMurtrie <mcmurtrie@pixelmemory.us>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 01 Dec 2009 08:44:15 -0800

Message-ID:

<4b1547df$0$1968$742ec2ed@news.sonic.net>

In article <7nkah7F3luvvkU1@mid.individual.net>,
Fencer <no.i.dont@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;
  public StringItr (Iterable i)
  {
    m_target= i;
  }
  public Iterator<String> iterator()
  {
    return new Iterator<String> ()
    {
      final Iterator i= m_target.iterator();
      public boolean hasNext()
      {
        return i.hasNext();
      }

      public String next()
      {
        return String.valueOf(i.next());
      }

      public void remove()
      {
        i.remove();
      }
    };
  }
}

....

for (String s : new StringItr(aListOfSomeClass))
....
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