public Object get(String attrName) {
        return attributes.get(attrName);
    }
Returns the value of the specified attribute in the current item as an
object; or null if the attribute either doesn't exist or the attribute
value is null.
<p>
An attribute value can be a
<ul>
<li>Number</li>
<li>String</li>
<li>binary (ie byte array or byte buffer)</li>
<li>boolean</li>
<li>null</li>
<li>list (of any of the types on this list)</li>
<li>map (with string key to value of any of the types on this list)</li>
<li>set (of any of the types on this list)</li>
</ul>

@see #isNull(String) #isNull(String) to check if the attribute value is
     null.
@see #isPresent(String) #isPresent(String) to check if the attribute
     value is present.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/document/Item.java