Java 将双精度转换为没有小数位的字符串的最佳方法
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原文地址: http://stackoverflow.com/questions/28707098/
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Best way to convert a double to String without decimal places
提问by John Alexander Betts
What is the best way to convert a double to String without decimal places?
将double转换为没有小数位的String的最佳方法是什么？
What about String.valueOf((int) documentNumber)?
关于什么 String.valueOf((int) documentNumber)?
The doubles always have 0 after the decimal dot. I don't need to round or truncate
双打总是在小数点后为 0。我不需要舍入或截断
采纳答案by Paco Abato
If you are sure that the double is indeed an integer use this one:
如果您确定 double 确实是一个整数，请使用这个：
NumberFormat nf = DecimalFormat.getInstance();
nf.setMaximumFractionDigits(0);
String str = nf.format(documentNumber);
As a bonus, this way you keep your locale's configuration as in thousand separator.
作为奖励，通过这种方式，您可以将语言环境的配置保持为千位分隔符。
EDIT
I add this previously removed option as it seems that was useful to the OP:
编辑
我添加了这个以前删除的选项，因为它似乎对 OP 有用：
Double.valueOf(documentNumber).intValue();
回答by Hann
You can convert a double to string with the minimum necessary precision:
您可以将 double 转换为具有最低必要精度的字符串：
public static String ceonvert(double d)
{
if(d == (long) d)
return String.format("%d",(long)d);
else
return String.format("%s",d);
}
Or this :
或这个 ：
> new DecimalFormat("#.##").format(2.199); //"2.2"
回答by kuki
You could try this:
你可以试试这个：
String numWihoutDecimal = String.valueOf(documentNumber).split("\.")[0];
回答by Piotr Zych
I'm not sure if this is best way, but i'am sure it's shortest way:
我不确定这是否是最好的方法，但我确定这是最短的方法：
((int)documentNumber) + ""
回答by Kirby
Given the newly edited question stating that the doubles are in fact integers, I'd say that your suggested answer String.valueOf((int) documentNumber)is great.
鉴于新编辑的问题说明双打实际上是整数，我会说您建议的答案String.valueOf((int) documentNumber)很棒。
回答by Padroniza??o S A
Quotation Marks + Double
引号 + 双
String s = "" + 0.07;
字符串 s = "" + 0.07;
LOL this is the best way, (obviously for experienced programmers)!
大声笑这是最好的方法，（显然对于有经验的程序员）！
回答by Varun Joshi
The easiest way to convert a double to string is to use quotation marks and then the double after that. double d = 123; String a = "" + d;
将 double 转换为 string 的最简单方法是使用引号，然后使用双引号。双 d = 123; 字符串 a = "" + d;
Another way is to use the toString method if you want to keep the way you converted it hidden
另一种方法是使用 toString 方法，如果你想保持你转换它的方式隐藏
public String toString()
{
String a + "" d;
}
