I believe what you want is:
@Test(enabled=false)
public class FooTest {
//
}
(You can apply the @Test annotation to the class, as well as to methods individually.)
The TestNG documentation has a comprehensive list of the supported annotations, and also describes exclusion/inclusion of tests by group if that’s of any interest. Here’s a quote from the relevant section:
@Test Marks a class or a method as
part of the test.…(snip)…
enabled: Whether methods on this class/method are enabled.
EDIT:
Ignoring a class by applying @Test(enabled=false) is apparently buggy functionality in some versions of TestNG according to this defect that was raised against TestNG.