Best way to convert a double to String without decimal places

问题

What is the best way to convert a double to String without decimal places?

What about String.valueOf((int) documentNumber)?

The doubles always have 0 after the decimal dot. I don't need to round or truncate

回答1:

If you are sure that the double is indeed an integer use this one:

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.

EDIT
I add this previously removed option as it seems that was useful to the OP:

Double.valueOf(documentNumber).intValue();

回答2:

You could try this:

String numWihoutDecimal = String.valueOf(documentNumber).split("\\.")[0];

回答3:

You can convert a double to string with the minimum necessary precision:

public static String ceonvert(double d)
{
    if(d == (long) d)
        return String.format("%d",(long)d);
    else
        return String.format("%s",d);
}

Or this :

> new DecimalFormat("#.##").format(2.199); //"2.2"

回答4:

I'm not sure if this is best way, but i'am sure it's shortest way:

((int)documentNumber) + ""

回答5:

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.

回答6:

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;

Another way is to use the toString method if you want to keep the way you converted it hidden

public String toString()
{
   String a + ""  d;
}

回答7:

Quotation Marks + Double

String s = "" + 0.07;

LOL this is the best way, (obviously for experienced programmers)!

来源：https://stackoverflow.com/questions/28707098/best-way-to-convert-a-double-to-string-without-decimal-places

标签

java

math