BigDecimal精度scale设定

BigDecimal scale为正数表示保留小数位数，为负数表示保留到整数位

BigDecimal a = new BigDecimal(12345678)
        .divide(new BigDecimal(10000), -1, RoundingMode.HALF_UP);
System.out.println(a.toPlainString());
BigDecimal b = new BigDecimal(12345678)
        .divide(new BigDecimal(10000), 0, RoundingMode.HALF_UP);
System.out.println(b.toPlainString());
BigDecimal c = new BigDecimal(12345678)
        .divide(new BigDecimal(10000), 1, RoundingMode.HALF_UP);
System.out.println(c.toPlainString());

1230
1235
1234.6

long a = new BigDecimal(12345678)
        .divide(new BigDecimal(10000), -1, RoundingMode.HALF_UP)
        .longValue();
System.out.println(a);
long b = new BigDecimal(12345678)
        .divide(new BigDecimal(10000), 0, RoundingMode.HALF_UP)
        .longValue();
System.out.println(b);
long c = new BigDecimal(12345678)
        .divide(new BigDecimal(10000), 1, RoundingMode.HALF_UP)
        .longValue();
System.out.println(c);

1230
1235
1234