Class.isAnonymousClass is implemented as:

    public boolean isAnonymousClass() {
        return "".equals(getSimpleName());
    }

However, getSimpleName generates quite a few superfluous objects that could be avoided if isAnonymousClass was implemented to check the conditions that will lead it to return "" more directly:

    public boolean isAnonymousClass() {
        return !isArray() && getEnclosingMethodInfo() != null &&
                getSimpleBinaryName0() == null;
    }

This reduces the average cost of isAnonymousClass by around 65%, which should be worthwhile since this is both a public API and a component of other internal methods in wide internal use.