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    <p>Does the message contain <code>last</code> at all? If not, <code>location</code> would be negative, and you should stop processing right there. This error might go unnoticed because you add 5 to <code>location</code> after that, which makes it equal to at least 4 even if <code>last</code> is not in the string (thanks <a href="https://stackoverflow.com/users/598289/sjuan76">SJuan76</a>).</p> <p>Even if the message contains <code>last</code>, is it guaranteed that it is followed by at least one extra character? If not, adding 5 to <code>location</code> would point outside the string for sure.</p> <p>Moreover, <code>end</code> may also be negative if there is no <code>&amp;</code> in the string after <code>location</code>. You should handle that somehow (i.e. by setting <code>end</code> to the length of the message in that case).</p> <p>Also, if <code>message</code> is a string, you can simply extract a substring of it using the <code>substring</code> method, no need for the <code>getChars</code> magic.</p> <p>A better solution would probably be something like this (I'm assuming that <code>message</code> is something like an URL and you are looking for the part between <code>last&gt;</code> and the next <code>&amp;</code>, based on your comment for one of the other answers):</p> <pre><code>location = message.indexOf("last&gt;"); if (location &gt;= 0) { String lastS; location += 5; end = message.indexOf('&amp;', location); if (end == -1) { // Handle the case when there is no "&amp;" after "last&gt;" in the message } else { lastS = message.substring(location, end); } } else { // Handle the case when there is no "last&gt;" in the message } </code></pre>
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    1. COloction is at least 4, because he adds 5. Anyway the issue is what message is he expecting, what is he receiving, and why the discrepance. The rest of the code just works if the message is valid (but we do not know what makes it valid)
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    2. COi am trying to get a persons name from an xml message, as everyone's name is a different size I could not use a default so I came up with this. lastS = message.substring(location); would this not just copy all of the message that is left ?
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    3. CO@Skeith: yes, it would, but it happens only when ``end`` is -1, which means that there is no ``&`` in the string after the ``last=`` part. I have assumed that in this case, you need the entire substring that is left. If that is not the case, you have to handle the case of ``end`` being -1 differently.
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