It's quite popular scenario for test when two different classes are executed in serial.
Like:

@run othervm -Xloggc:out.log Test
@run CheckLog out.log

currently jtreg doesn't allow to define two classes in a single java source:
jtreg runs only public classes and doesn't recognize inner classes.

It would be great if one was able to write like:
/*
 * @test
 * @run othervm -Xloggc:out.log Test.Run
 * @run Test.CheckLog out.log
 */
public class Test {
    public static class Run {...}
    public static class CheckLog {...}
}