public static boolean isNumber(String str) {
        return !StringUtils.isEmpty(str) && NUMBER_PATTERN.matcher(str).matches();
    }
@Test
    void testIsNumber() {
        String str1 = "abc";
        assertFalse(NamingUtils.isNumber(str1));
        
        String str2 = "123456";
        assertTrue(NamingUtils.isNumber(str2));
    }