"Go" ArrayList the same time to delete----good

Original URL: http://javag.iteye.com/blog/403097

Method One

Java code

2. arraylist<string> list = new arraylist<string> ();
4. List.add ("one");
6. List.add ("both");
8. List.add ("both");
10. List.add ("both");
12. List.add ("both");
14. For (int i=0;i<list.size (); i++) {
16. if (List.get (i). Equals ("II")) {
18. List.remove (i);
20. }
22. }
24. SYSTEM.OUT.PRINTLN (list);

Results:

Java code

1. [One, the other, the other]

Method Two

Java code

1. arraylist<string> list = new arraylist<string> ();
2. List.add ("one");
3. List.add ("both");
4. List.add ("both");
5. List.add ("both");
6. List.add ("both");
7. for (String s:list) {
8. if (S.equals ("both")) {
9. List.remove (s);
10. }
11. }
12. SYSTEM.OUT.PRINTLN (list);

Results:

Java code

1. Exception in thread "main" Java.util.ConcurrentModificationException
2. At Java.util.abstractlist$itr.checkforcomodification (Abstractlist.java:372)
3. At Java.util.abstractlist$itr.next (Abstractlist.java:343)
4. At Test.main (Test.java:)

Method Three:

Java code

2. arraylist<string> list = new arraylist<string> ();
4. List.add ("one");
6. List.add ("both");
8. List.add ("both");
10. List.add ("both");
12. List.add ("both");
14. Iterator<string> iter = List.iterator ();
16. while (Iter.hasnext ()) {
18. String s = iter.next ();
20. if (S.equals ("both")) {
22. Iter.remove ();
24. }
26. }
28. SYSTEM.OUT.PRINTLN (list);

Results:

Java code

1. [One]

Conclusion:

It's better to remove or use iterators, and the rest will be problematic.

"Go" ArrayList the same time to delete----good