public static String toCapitalizeCamelCase(String s) {
        if (s == null) {
            return null;
        }
        s = toCamelCase(s);
        return s.substring(0, 1).toUpperCase() + s.substring(1);
    }
@Test
    public void testToCapitalizeCamelCase(){
        String a = "user_name";
        String b = "user_name_age";
        Assert.assertEquals("UserName", StringKit.toCapitalizeCamelCase(a));
        Assert.assertEquals("UserNameAge", StringKit.toCapitalizeCamelCase(b));
    }