java中double转化为BigDecimal精度缺失的实例

@SuppressWarnings("static-access")  public static void main(String[] args) {    System.out.println(3215.10/2);    BigDecimal bd = new BigDecimal(3215.10/2);    System.out.println(bd);    System.out.println(bd.setScale(2, bd.ROUND_DOWN).doubleValue());  }

1607.551607.5499999999999545252649113535881042480468751607.55