Java：将String转换为有效金额的正确方法是什么（BigDecimal）

Question

I have to convert an incoming String field into a BigDecimal field that would represent a valid amount of money, for example:

String amount = "1000";

BigDecimal valid_amount = convert(amount);

print(valid_amount.toString())//1000.00

What is the right API to use convert a String into a valid amount of money in Java (eg: apache commons library)?

Thanks in advance,

Answer 1

How about the BigDecimal(String) constructor?

String amount = "1000";
BigDecimal validAmount = new BigDecimal(amount);
System.out.println(validAmount); // prints: 1000

If you want to format the output differently, use the Formatter class.

Answer 2

Did you mean to achieve the following:?

NumberFormat nf = NumberFormat.getCurrencyInstance();
System.out.println(nf.format(new BigDecimal("1000")));

Output

$1,000.00

Answer 3

Use new BigDecimal(strValue) .

Will save you enormous pain and suffering resulting from The Evil BigDecimal Constructor

Answer 4

There is the Joda-Money library for dealing with money values. But, according to the web site, "the current development release intended for feedback rather than production use."

Answer 5

If you want to print decimal with, use setScale method

String amount = "1000";
BigDecimal validAmount = new 
BigDecimal(amount).setScale(2,RoundingMode.CEILING);
System.out.println(validAmount); // prints: 1000.00