TestNG execution order for test groups

Say I have the following XML:

<suite name="MATS">
    <test name="mats_test">
    <groups>
        <run>
            <include name="mats" />
        </run>
    </groups>
    <packages>
        <package name="com.tests" />
    </packages>
    </test>
</suite>

And each test class in the com.tests package has only one test method with varying group annotations. Will the beforeClass() and afterClass() methods of classes not in the "mats" group be executed?