java-BigDecimal百位取整和科学记数法转换

       String num = "12451";

        BigDecimal bd = new BigDecimal(num);
        bd = bd.setScale(-2, BigDecimal.ROUND_DOWN);

        System.out.println("向下百位取整后：" + bd.intValue());

        bd = new BigDecimal(num);
        bd = bd.setScale(-2, BigDecimal.ROUND_UP);
        System.out.println("向上百位取整后：" + bd.intValue());

        BigDecimal bigDecimal = new BigDecimal("10000")
                .multiply(new BigDecimal("0.35"))
                .setScale(-2, BigDecimal.ROUND_DOWN);
        System.out.println("bigDecimal = " + bigDecimal.toString());
        System.out.println("bigDecimal = " + bigDecimal.toPlainString());

 

2.输出结果：