z_F4JInternalStringUtil { public static String join(int[] follows) { StringBuilder buf = new StringBuilder(11 * follows.length); for (int follow : follows) { if (0 != buf.length()) { buf.append(","); } buf.append(follow); } return buf.toString(); } private  z_F4JInternalStringUtil(); static String maskString(String str); static String join(int[] follows); static String join(long[] follows); static String join(String[] track); static String join(String[] track, String separator); static String formatISO8601Datetime(Calendar cal);  }
@Test public void join() { assertThat(z_F4JInternalStringUtil.join(new String[] {"foo"}, "&"), is("foo")); assertThat(z_F4JInternalStringUtil.join(new String[] {"foo", "bar", "baz"}, "&"), is("foo&bar&baz")); }