Touring Language APIs - Beginning Java 7 - page 417

BigDecimal invoiceSubtotal = new BigDecim-

al("285.36");
BigDecimal discountPercent = new BigDecimal("0.10");
BigDecimal discount = invoiceSub-

total.multiply(discountPercent);
discount = discount.setScale(2, Roundin-

gMode.HALF_UP);
BigDecimal

subtotalBeforeTax = invoiceSub-

total.subtract(discount);
subtotalBeforeTax = subtotalBeforeTax.setScale(2,

RoundingMode.HALF_UP);
BigDecimal salesTaxPercent = new BigDecimal("0.05");
BigDecimal salesTax = subtotalBe-

foreTax.multiply(salesTaxPercent);
salesTax

= salesTax.setScale(2, Roundin-

gMode.HALF_UP);
BigDecimal

invoiceTotal = subtotalBe-

foreTax.add(salesTax);
invoiceTotal = invoiceTotal.setScale(2, Roundin-

gMode.HALF_UP);
System.out.println("Subtotal: "+invoiceSubtotal);
System.out.println("Discount: "+discount);
System.out.println("SubTotal after discount: "+sub-
totalBeforeTax);
System.out.println("Sales Tax: "+salesTax);
System.out.println("Total: "+invoiceTotal);

}

}

Listing 4-32 ' s main() methodfirstcreates BigDecimal objects invoiceSub-
total and discountPercent that are initialized to 285.36 and 0.10 , respect-
ively.Itthenmultiplies invoiceSubtotal by discountPercent andassignsthe
BigDecimal result to discount .
At this point, discount contains 28.5360. Apart from the trailing zero, this value
isthesameasthatgeneratedby invoiceSubtotal*DISCOUNT_PERCENT in List-
ing4-31 . Thevaluethatshouldbestoredin discount is28.54.Tocorrectthisprob-