Re: How to loop through a list while inside the loop, the list size may be decreased?

From:

Knute Johnson <nospam@rabbitbrush.frazmtn.com>

Newsgroups:

comp.lang.java.programmer

Date:

Fri, 12 Sep 2008 09:58:00 -0700

Message-ID:

<48ca6593$0$24591$b9f67a60@news.newsdemon.com>

www wrote:

Hi,

I have a List containing Person objects. I am going through the list
using a for loop. Inside the loop, I check each Person obj, if he/she
disqualifies, I want to delete the object from the list.

I found that the for loop always run into out of index exception,
because the list size is gradually decreased, but the for loop
"remembers" the original size.

for(int i=0; i < list.size(); i++)
{
    if(..) //check
    {
        list.get(i).remove(i); //this decreases the number of objects
in list, correct?
    }

}

Thank you very much.

The iterator is the way to go but to follow your method:

import java.util.*;

public class test99 {
     public static void main(String[] args) {
         List list = new ArrayList();
         list.add("one");
         list.add("two");
         list.add("three");
         list.add("four");
         list.add("five");

         int n = 0;
         while (n < list.size()) {
             String str = (String)list.get(n);
             if (str.equals("three"))
                 list.remove(n);
             else
                 ++n;
         }

         for (int i=0; i<list.size(); i++)
             System.out.println(list.get(i));
     }
}

--

Knute Johnson
email s/nospam/knute2008/

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