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Thread: Beginner programming- strange problem

  1. #1
    Junior Member
    Join Date
    Aug 2011
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    Default Beginner programming- strange problem

    Hi everyone,
    Sorry if this is blatently obvious but i am new to programming.
    My problem is with this piece of code:

    currEx = in.charAt(currSubStr);

    Java says the following:

    Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 0
    at java.lang.String.charAt(String.java:686)
    at AssigOne2011.main(AssigOne2011.java:38)

    I assume this means that the int currSubString is not valid, however i know foor sure that this is 0 seeing as i assign that value one line before the one i am having a problem with.

    Any help would be greatly appreciated, as i am stumped!

  2. #2
    Super Moderator Sean4u's Avatar
    Join Date
    Jul 2011
    Tavistock, UK
    Thanked 103 Times in 93 Posts

    Default Re: Beginner programming- strange problem

    Are you validating the length of the String before you use charAt()? Maybe the String is not as long as you think it is. If a String's length is 0, it has *no* valid indexes.

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