public static String mobilePhone(String num) {
		if (StrUtil.isBlank(num)) {
			return StrUtil.EMPTY;
		}
		return StrUtil.hide(num, 3, num.length() - 4);
	}
@Test
	public void mobilePhoneTest() {
		assertEquals("180****1999", DesensitizedUtil.mobilePhone("18049531999"));
	}