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Thread: string index out of bounds exeption when attempting to read a string char by char

  1. #1
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    Default string index out of bounds exeption when attempting to read a string char by char

    this is a homework project that i have reached a dead end with.
    the object of the program is to read a file, scan each line, cheack for brackets and then number them matching each opening and closing bracket.
    however, when it reaches the first bracket, it runs a exception and i can not figure it out.
    here is the main loop.

    while(inPut.hasNextLine()){
    isbracket =inPut.nextLine();

    for (int i= 0; i <=isbracket.length() ; i++){
    checkIt = Character.toString(isbracket.charAt(i));
    System.out.print(CheckBracket(checkIt));}
    }
    }

    here is the method i call to check for brackets

    public static String CheckBracket(String checkIt){
    int numBracket = 0;
    String Checked ="";
    if (checkIt.equals("{")){
    numBracket++;
    Checked = (checkIt) +numBracket;}
    if (checkIt.equals("}") && numBracket > 0){
    Checked = checkIt +Integer.toString(numBracket);
    numBracket--;}
    if (checkIt.equals("}") && numBracket == 0){
    Checked = (checkIt) + numBracket;}
    if (checkIt != null) {Checked = checkIt;}
    return Checked;

    this is the error
    {java.lang.StringIndexOutOfBoundsException: String index out of range: 12
    at java.lang.String.charAt(Unknown Source)
    at MatchUp2.main(MatchUp2.java:40)

    (line 40 is: checkIt = Character.toString(isbracket.charAt(i))
    can some one please just point me in the right direction?


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: string index out of bounds exeption when attempting to read a string char by char

    java.lang.StringIndexOutOfBoundsException: String index out of range: 12
    at java.lang.String.charAt(Unknown Source)
    at MatchUp2.main(MatchUp2.java:40)
    How long is the String being scanned on line 40? The index is past the end of the String.
    Remember: indexes range in value from 0 to the length-1
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: string index out of bounds exeption when attempting to read a string char by char

    lol that had JUST occured to me as well, i have fixed that by subtracting one from the isbracket.length(). now however i have another problem, i can either make it print the whole file in one line, or i can make it print it one work per a line. any ideas how to make it keep the strings intact?

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: string index out of bounds exeption when attempting to read a string char by char

    how to make it keep the strings intact?
    What do you mean by "intact"? What is the program doing that is a problem?
    If you don't understand my answer, don't ignore it, ask a question.

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