BigDecimal num1 = new BigDecimal(10); BigDecimal num2 = new BigDecimal(5); BigDecimal num3 = null; //加法 num3 = num1.add(num2) System.out.println("num1 + num2 = " + num3); //减法 num3 = num1.subtract(num2); System.out.println("num1 - num2 = " + num3); //乘法 num3 = num1.multiply(num2); System.out.println("num1 * num2 = " + num3); //除法(四舍五人保留两位小数) num3 = num1.divide(num2).setScale(2,BigDecimal.ROUND_HALF_UP); System.out.println("num1 / num2 = " + num3);