Why BigDecimal.Sclae() not not working for non decimal value

Why BigDecimal.Sclae() not not working for non decimal value

      public static void main(String[] args) {
            // TODO Auto-generated method stub
            formatBD(2,new BigDecimal(10));
            formatBD(2,new BigDecimal(10.0567));
            formatBD(2,new BigDecimal(10.05));
            formatBD(2,new BigDecimal(10.000023));
      }
      
      public static void   formatBD(int sca,BigDecimal amount)
      {
            System.out.println(amount.scale() > 0 ? amount.setScale(2, BigDecimal.ROUND_CEILING) : amount);
      }
}

Output :10
10.06
10.06
10.01