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

Knute Johnson <>
Fri, 12 Sep 2008 09:58:00 -0700
www wrote:


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();

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

         for (int i=0; i<list.size(); i++)


Knute Johnson
email s/nospam/knute2008/

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