Einfache Frage, wie funktioniert dieser Code?

public class T {

    public static void main(String[] args) throws Exception {
        new T().m();
    }

    public // as mentioned by Bozho
    void foo(String... s) {
        System.err.println(s[0]);
    }

    void m() throws Exception {
        String[] a = new String[]{"hello", "kitty"};
        System.err.println(a.getClass());
        Method m = getClass().getMethod("foo", a.getClass());
        m.invoke(this, (Object[]) a);
    }
}

Ausgabe

class [Ljava.lang.String;
Exception in thread "main" java.lang.IllegalArgumentException: wrong number of arguments
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)