NumberFormatException.qhelp

<!DOCTYPE qhelp PUBLIC
  "-//Semmle//qhelp//EN"
  "qhelp.dtd">
<qhelp>


<overview>
<p>Methods such as <code>Integer.parseInt</code> that parse strings into numbers
throw 
<code>NumberFormatException</code> if their arguments cannot be parsed.
This exception should be caught so that any parse errors can be handled.
</p>

</overview>
<recommendation>

<p>It is usually best to handle <code>NumberFormatException</code> in a <code>catch</code> clause
surrounding the call to the parsing method.</p>

</recommendation>
<example>

<p>In the following example, the first call to <code>Integer.parseInt</code> does not catch the exception.
The second call does.
</p>

<sample src="NumberFormatException.java" />

</example>
<references>


<li>
  Java Platform, Standard Edition 8, API Specification:
  <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html#valueOf-java.lang.String-">Integer.valueOf</a>,
  <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html#parseInt-java.lang.String-">Integer.parseInt</a>,
  <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html#parseLong-java.lang.String-">Long.parseLong</a>,
  <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NumberFormatException.html">NumberFormatException</a>.
</li>


</references>
</qhelp>