BigDecimal简易四则运算

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);