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POJava Android : Comparator gets OutOfBoundsException
 

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  1. POJava Android : Comparator gets OutOfBoundsException
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    <p>I'm not really an expert and can't figure out why is it going off bounds</p> <pre><code>public class ParticipantIndexComparator implements Comparator&lt;Integer&gt; { final List&lt;Participant&gt; participants; public ParticipantIndexComparator(ArrayList&lt;Integer&gt; numbersToSort) { Log.d("MyLog","numbersToSort.size=" + numbersToSort.size()); participants = new ArrayList&lt;Participant&gt;(); for (int i=0;i&lt;numbersToSort.size();i++) { participants.add(i, competition.participant.get(numbersToSort.get(i))); participants.get(i).comparator = numbersToSort.get(i); } Log.d("MyLog","participants.size="+participants.size()); } @Override public int compare(Integer i1, Integer i2) { Log.d("MyLog","in compare: participants.size=" + participants.size() + "i1=" + i1 + " i2=" + i2); long l1 = participants.get(i1).kpTime.get(kpSelected); long l2 = participants.get(i2).kpTime.get(kpSelected); return Long.valueOf(l1).compareTo(Long.valueOf(l2)); } } </code></pre> <p>well , my first Log shows me <code>participants.size=8.</code> Second Log shows me <code>participants.size=8.</code> third Log shows me <code>participants.size=8, i1=13 i2=14.</code></p> <p>Why??? Why is it 13 and 14 when I checked size at every step and it's always 8 - I can't understand. I'm not an expert and can't figure out this myself</p> <p>here is stacktrace : </p> <pre><code>11-24 02:41:23.612: E/AndroidRuntime(4802): java.lang.IndexOutOfBoundsException: Invalid index 14, size is 8 11-24 02:41:23.612: E/AndroidRuntime(4802): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251) 11-24 02:41:23.612: E/AndroidRuntime(4802): at java.util.ArrayList.get(ArrayList.java:304) 11-24 02:41:23.612: E/AndroidRuntime(4802): at ru.maximhasanov.skitimer.FinalProtocolActivity$ParticipantIndexComparator.compare(FinalProtocolActivity.java:311) 11-24 02:41:23.612: E/AndroidRuntime(4802): at ru.maximhasanov.skitimer.FinalProtocolActivity$ParticipantIndexComparator.compare(FinalProtocolActivity.java:1) 11-24 02:41:23.612: E/AndroidRuntime(4802): at java.util.TimSort.countRunAndMakeAscending(TimSort.java:320) 11-24 02:41:23.612: E/AndroidRuntime(4802): at java.util.TimSort.sort(TimSort.java:185) 11-24 02:41:23.612: E/AndroidRuntime(4802): at java.util.TimSort.sort(TimSort.java:169) 11-24 02:41:23.612: E/AndroidRuntime(4802): at java.util.Arrays.sort(Arrays.java:2038) 11-24 02:41:23.612: E/AndroidRuntime(4802): at java.util.Collections.sort(Collections.java:1891) 11-24 02:41:23.612: E/AndroidRuntime(4802): at ru.maximhasanov.skitimer.FinalProtocolActivity.sortNumbers(FinalProtocolActivity.java:213) </code></pre>
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    1. PO
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    1. USVlad Alexeev
    1. USVlad Alexeev
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      1. POJava Android : Comparator gets OutOfBoundsException
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      1. VTUpMod
    1. COCould you pleasy clarify your Log entries. How is it possible that your first log entry is `participants.size=8.` if your first log string is `numbersToSort.size=`? You should debug step by step to identify when your code stops doing what it should do.
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      1. POJava Android : Comparator gets OutOfBoundsException
      1. USRobin Ellerkmann
    2. COTrying to wrap my head around this. Am I right in thinking that numbersToSort holds a list of the numbers (essentially indexes) of the participants that you need to sort? Like, you have 15 participants, numbered 1-15, but you only want to sort 8 of them, and numbersToSort holds a list that could be, for example {14, 2, 8, 10, 9, 3, 7, 12}? And you sort these 8 participants by their times?
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      1. POJava Android : Comparator gets OutOfBoundsException
      1. USMike M.
 

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