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John Alexander Betts
John Alexander Betts

Reputation: 5204

Best way to convert a double to String without decimal places

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

Upvotes: 12

Views: 50101

Answers (8)

David Tong
David Tong

Reputation: 1

I had a similar issue where Gson converted what should have been an Integer value to a Double and I wanted to write it as a String. NumberFormat works, but you also need to disable the grouping delimiter otherwise it outputs 1,234,567:

Object num = new Double(1234567);
NumberFormat nf = DecimalFormat.getIntegerInstance();
nf.setGroupingUsed(false);
String str = nf.format((Number)num);

Upvotes: 0

Padronização S A
Padronização S A

Reputation: 55

Quotation Marks + Double

String s = "" + 0.07;

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

Upvotes: -3

Varun Joshi
Varun Joshi

Reputation: 34

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;
}

Upvotes: 0

Kirby
Kirby

Reputation: 15875

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.

Upvotes: 0

Paco Abato
Paco Abato

Reputation: 4065

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();

Upvotes: 16

Piotr Zych
Piotr Zych

Reputation: 503

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

((int)documentNumber) + ""

Upvotes: 1

kuki
kuki

Reputation: 71

You could try this:

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

Upvotes: 7

Hann
Hann

Reputation: 713

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"

Upvotes: 4

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