public static String join(String[] array) {
        if (ArrayUtils.isEmpty(array)) {
            return EMPTY_STRING;
        }
        StringBuilder sb = new StringBuilder();
        for (String s : array) {
            sb.append(s);
        }
        return sb.toString();
    }
@Test
    void testJoin() throws Exception {
        String[] s = {"1", "2", "3"};
        assertEquals(StringUtils.join(s), "123");
        assertEquals(StringUtils.join(s, ','), "1,2,3");
        assertEquals(StringUtils.join(s, ","), "1,2,3");
    }