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    <p>If you're sure that this object is an <code>Integer</code> :</p> <pre><code>int i = (Integer) object; </code></pre> <p>Or, starting from Java 7, you can equivalently write:</p> <pre><code>int i = (int) object; </code></pre> <p>Beware, it can throw a <a href="http://download.oracle.com/javase/6/docs/api/java/lang/ClassCastException.html" rel="noreferrer"><code>ClassCastException</code></a> if your object isn't an <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Integer.html" rel="noreferrer"><code>Integer</code></a> and a <a href="http://download.oracle.com/javase/6/docs/api/java/lang/NullPointerException.html" rel="noreferrer"><code>NullPointerException</code></a> if your object is <code>null</code>.</p> <p>This way you assume that your Object is an Integer (the wrapped int) and you unbox it into an int.</p> <p><code>int</code> is a primitive so it can't be stored as an <code>Object</code>, the only way is to have an <code>int</code> considered/boxed as an <code>Integer</code> then stored as an <code>Object</code>.</p> <hr> <p>If your object is a <code>String</code>, then you can use the <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Integer.html#valueOf(java.lang.String)" rel="noreferrer"><code>Integer.valueOf()</code></a> method to convert it into a simple int :</p> <pre><code>int i = Integer.valueOf((String) object); </code></pre> <p>It can throw a <a href="http://download.oracle.com/javase/6/docs/api/java/lang/NumberFormatException.html" rel="noreferrer"><code>NumberFormatException</code></a> if your object isn't really a <code>String</code> with an integer as content.</p> <hr> <p><strong>Resources :</strong></p> <ul> <li><a href="http://download.oracle.com/javase/1.5.0/docs/guide/language/autoboxing.html" rel="noreferrer">Oracle.com - Autoboxing</a></li> <li><a href="http://download.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html" rel="noreferrer">Oracle.com - Primitive Data types</a></li> </ul> <p><strong>On the same topic :</strong></p> <ul> <li><a href="https://stackoverflow.com/questions/501653/java-whats-the-difference-between-autoboxing-and-casting">Java: What's the difference between autoboxing and casting?</a></li> <li><a href="https://stackoverflow.com/questions/766468/autoboxing-so-i-can-write-integer-i-0-instead-of-integer-i-new-integer0">Autoboxing: So I can write: Integer i = 0; instead of: Integer i = new Integer(0);</a></li> <li><a href="https://stackoverflow.com/questions/2565397/convert-object-into-primitive-int">Convert Object into primitive int</a></li> </ul>
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    1. POHow to cast an Object to an int
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    1. COAre you sure about the NullPointerException? I thought that a null Object would just yield a null Integer....
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    2. COThe `NullPointerException` will occur during the unboxing of `Integer` into `int`
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    3. COAh, yeah, my brain ignored the left part of the assignment...
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