BigDecimal数的格式 [英] Format of BigDecimal number
问题描述
BigDecimal val = BigDecimal.valueOf(0.20);
System.out.println(a);
我想在val中存储值0.20
,而不是0.2
.我能做什么?
I want to store in val a value 0.20
and not 0.2
. What I can do ?
我不认为在这种情况下可以使用NumberFormat
,当我使用NumberFormat
时,我必须知道十进制数字的长度!我可以有0.20或0.5000,我不知道十进制数字的确切长度,所以我不能使用:
I dont think I can use NumberFormat
in this case, when I use NumberFormat
I must know what the length of my decimal number is! I can have 0.20 or 0.5000, I don't know the exact length of my decimal number, so I cannot use :
DecimalFormat df = new DecimalFormat("#0.00");
或
DecimalFormat df = new DecimalFormat("#0.00000");
也许我点后只有2个数字,或者5个或更多数字,但是该程序无法工作:
maybe I have just 2 numbers after point or 5 numbers or more, and this program doesn't work:
BigDecimal a = BigDecimal.valueOf(0.20);//i give an example of 0.2 i can have 0.98...0
System.out.println(a);
NumberFormat nf1 = NumberFormat.getInstance();
System.out.println(nf1.format(0.5000));
推荐答案
您可以使用BigDecimal的String构造函数.它保留了比例尺(这就是您想要的).
You could use the String constructor of BigDecimal. It preserves the scale (which is what you want).
BigDecimal val = new BigDecimal("0.20");
请参见 http://docs.oracle.com/javase/1.5.0/docs/api/java/math/BigDecimal.html#BigDecimal(java.lang.String )
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