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for loop and the list iterator

vuthlarhi donald
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Joined: Jul 31, 2006
Posts: 76
how can I use the for loop with the list iterator to be able to use the trim method, illustrate by example on this program



Raghavan Muthu
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Joined: Apr 20, 2006
Posts: 3355

I don't get your doubt. Have you tried running the program? It has the for loop to use the list.


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Raghavan Muthu
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Joined: Apr 20, 2006
Posts: 3355

The program seems to use the list object and use strings inside it.

You can directly use the trim() method on 'a' right?
Bill Shirley
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Joined: Nov 08, 2007
Posts: 457
You may be confusing String.trim() and Iterator.remove().

You would want access to the iterator to remove items from the list. Invoking trim on a string will return a new string instance that has been trimmed (white space removed from the front and back).

To get access to the iterator, you use the old form (pre Java 5) of the for loop.



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Rob Spoor
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Joined: Oct 27, 2005
Posts: 19783
    
  20

Whenever you use the new for loop, you lose the iterator or array indexes. It's a price you pay for the shorter code.

So if you need the iterator to remove items, the array index (e.g. to copy array items) or a list iterator (because of the add and set methods), there is no other option but to use the old for loop.


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