java BigDecimal 四则运算 保留两位小数

BigDecimal a= new BigDecimal("10");

BigDecimal b= new BigDecimal("5");

BigDecimal c= null;

1.加法-add

c  = a.add(b).setScale(2, BigDecimal.ROUND_HALF_UP);      

System.out.println("求和：" + c); 

2.减法-subtract

c = a.subtract(b).setScale(2, BigDecimal.ROUND_HALF_UP); 

System.out.println("求差：" + c); 

3.乘法-multiply

c = a.multiply(b).setScale(2, BigDecimal.ROUND_HALF_UP); 

System.out.println("乘法积：" + c); 

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4.除法-divide

c = a.divide(b).setScale(2, BigDecimal.ROUND_HALF_UP); 

c = a.divide(new BigDecimal(100), 2, BigDecimal.ROUND_HALF_UP)

System.out.println("除法结果：" + c); 

5.整数舍弃零

DecimalFormat df = new DecimalFormat("###.##");
df.format(new BigDecimal(88.88))------>输出结果：88.88
df.format(new BigDecimal(66.00))------>输出结果：66