Java：将字符串转换为有效金额的正确方法是什么（BigDecimal）
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Java: What is the right way to convert String into a valid amount of money(BigDecimal)
提问by Midnight Blue
I have to convert an incoming String field into a BigDecimal field that would represent a valid amount of money, for example:
我必须将传入的 String 字段转换为代表有效金额的 BigDecimal 字段，例如：
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)?
使用 Java 将字符串转换为有效金额的正确 API 是什么（例如：apache commons 库）？
Thanks in advance,
提前致谢，
回答by Skrud
How about the BigDecimal(String)constructor?
又如何BigDecimal(String)构造？
String amount = "1000";
BigDecimal validAmount = new BigDecimal(amount);
System.out.println(validAmount); // prints: 1000
If you want to format the output differently, use the Formatterclass.
如果要以不同方式格式化输出，请使用Formatter该类。
回答by ring bearer
Did you mean to achieve the following:?
您的意思是要实现以下目标：？
NumberFormat nf = NumberFormat.getCurrencyInstance();
System.out.println(nf.format(new BigDecimal("1000")));
Output
输出
,000.00
回答by leedm777
There is the Joda-Moneylibrary for dealing with money values. But, according to the web site, "the current development release intended for feedback rather than production use."
有用于处理货币价值的Joda-Money库。但是，根据该网站的说法，“当前的开发版本旨在用于反馈而不是生产用途。”
回答by Tomas Pinto
If you want to print decimal with, use setScale method
如果要打印十进制，请使用 setScale 方法
String amount = "1000";
BigDecimal validAmount = new
BigDecimal(amount).setScale(2,RoundingMode.CEILING);
System.out.println(validAmount); // prints: 1000.00
回答by Marcus Leon
Use new BigDecimal(strValue).
使用new BigDecimal(strValue).
Will save you enormous pain and suffering resulting from The Evil BigDecimal Constructor
将为您节省由邪恶的 BigDecimal 构造函数带来的巨大痛苦和痛苦
