How to write out double with only 2 digits?

Fred

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Jan 3, 2002, 9:27:30 AM1/3/02

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I have a variable which is double but I would like to write it out with
only 2 digits! How do I do that? Many thanks in advance!

Fred

Jon Skeet

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Jan 3, 2002, 9:54:22 AM1/3/02

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Fred <""fred\"@(none)> <Fred <""fred\"@(none)>> wrote:
> I have a variable which is double but I would like to write it out with
> only 2 digits! How do I do that? Many thanks in advance!

Have a look at java.text.DecimalFormat

--
Jon Skeet - <sk...@pobox.com>
http://www.pobox.com/~skeet/
If replying to the group, please do not mail me too

Doug

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Jan 3, 2002, 9:55:17 AM1/3/02

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In article <3c3469fb$1...@newsflash.abo.fi>, Fred <""fred\"@(none)> wrote:
>I have a variable which is double but I would like to write it out with
>only 2 digits! How do I do that? Many thanks in advance!

See Java.Text.NumberFormat.

doug

Manfred Leonhardt

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Jan 3, 2002, 10:23:59 AM1/3/02

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Hi Fred,

I assume you mean 2 significant digits. Try the following:

DecimalFormat df = new DecimalFormat( "#.00" );
System.out.println( df.format( "23.4567898" ) );

Regards,
Manfred.

Fred

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Jan 3, 2002, 12:43:25 PM1/3/02

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Manfred Leonhardt wrote:

What should I need to import?

Jon A. Cruz

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Jan 3, 2002, 2:05:17 PM1/3/02

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Fred wrote:

import java.text.DecimalFormat;

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Jon A. Cruz
http://www.geocities.com/joncruz/action.html

David Bolton

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Jan 5, 2002, 12:08:37 AM1/5/02

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Hello,
When I compiled and ran the posted code, I got the error:

Exception in thread "main" java.lang.IllegalArgumentException: Cannot format
given Object as a Number
at java.text.NumberFormat.format(NumberFormat.java:209)
at java.text.Format.format(Format.java:121)
at SigDig.main(SigDig.java:9)

Here's the complete file that I compiled and tried to run:

import java.text.DecimalFormat;

class SigDig {

public SigDig() {}

public static void main(String ar[]) {

DecimalFormat df = new DecimalFormat( "#.00" );
System.out.println( df.format( "23.4567898" ) );
}
}

Anyone know what's wrong?

Best regards,
David
www.ideaplace.org/dlb.html

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David Bolton

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Jan 5, 2002, 12:27:40 AM1/5/02

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Hello Stan,

You need to include the package in the compiling. Assuming that you're
using Windows 98 as I am, here's what I typed in dos to compile the code:

C:\j\a>c:\jdk\bin\javac fm.java pkg\Fred.java

This will compile both fm and Fred at the same time...although Fred can be
compiled beforehand. I also ran the code with the dos line:

C:\j\a>c:\jdk\bin\java -cp . fm
doit

(The C:\j\a is where I have your fm and pkg, and jdk is the directory of my
jdk 1.3.1.)

Best regards,

David
www.ideaplace.org/dlb.html

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Tom Davies

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Jan 5, 2002, 1:06:52 AM1/5/02

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David Bolton wrote:

> Hello,
> When I compiled and ran the posted code, I got the error:
>
> Exception in thread "main" java.lang.IllegalArgumentException: Cannot format
> given Object as a Number
> at java.text.NumberFormat.format(NumberFormat.java:209)
> at java.text.Format.format(Format.java:121)
> at SigDig.main(SigDig.java:9)

DecimalFormat doesn't format Strings, only numbers.

Form the Javadoc for Format.format:

"Throws:
IllegalArgumentException - if the Format cannot format the given object"

Tom

Mishko

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Jan 5, 2002, 7:26:06 PM1/5/02

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Just remove quotes "" on the number, it works..

"Tom Davies" <tomd...@optushome.com.au> wrote in message
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