private static String getParametersString(Class<?>... clazzes) {
        StringBuilder sb = new StringBuilder("(");
        boolean first = true;
        for (Class<?> clazz : clazzes) {
            if (first)
                first = false;
            else
                sb.append(",");

            if (clazz != null)
                sb.append(clazz.getCanonicalName());
            else
                sb.append("null");
        }
        sb.append(")");
        return sb.toString();
    }
Returns an array of the given classes.
android/android_framework/base/src/main/java/util/XposedHelpers.java