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string index out of range

Ann Ron
Greenhorn

Joined: Oct 21, 2003
Posts: 24
Hi,
I am writing this code and getting an error : java.lang.StringIndexOutOfBoundsException: String index out of range: -70
This is my code snippet,Any idea how I solve this one..
************************************************************
String outstring = "123";
String repid;
String incno;
int MessageLength = MQ_Message.getMessageLength( );
outString = MQ_Message.readString(MessageLength);
repid = outString.substring(83,13);
incno = outString.substring(96,9);
**************************************************
Thanks in advance
Ann
Joe Ess
Bartender

Joined: Oct 29, 2001
Posts: 8997
    
    9

How about checking that variable MessageLength and seeing how long of a String you've received?


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Ernest Friedman-Hill
author and iconoclast
Marshal

Joined: Jul 08, 2003
Posts: 24187
    
  34

You wrote

repid = outString.substring(83,13);
incno = outString.substring(96,9);

The two arguments to substring are the first (inclusive) and last (exclusive) character to include; it looks like you're assuming the second argument is a count, which it's not.
This and many other methods are documented in the online API Javadocs -- learn to use them, they'll save you a lot of trouble!
Now, beyond just the technical, and on to the stylistic: you've got a number "messageLength" which is the unknown length of a message. But your code is assuming that it will always be greater than 105. You might want to explicitly test that, and handle the error case where it's not. Just a thought -- otherwise, you'll soon be asking us about another mystery exception!


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Matthew Brown
Bartender

Joined: Apr 06, 2010
Posts: 4490
    
    8

Raman Jha,
Your post was moved to a new topic.
 
I agree. Here's the link: http://aspose.com/file-tools
 
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