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Java Discussion Thread
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Mar 13th, 2005

Number Rounding

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Can someone help me create a rounding routine? I have some mathematical calculations being done in a program that the final result is a double. The only trouble is, is when I want to display it, there are too many digits appearing. I have searched the Sun web site and others without finding anything that will help.

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AQWst

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Light Poster

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since Jan 2005

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Mar 14th, 2005

Re: Number Rounding

You should really dig into the API docs a bit. Depending on what you want to achieve you can use one of two classes at least to achieve what you want using only standard API functions.

jwenting

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duckman

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since Nov 2004

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Mar 14th, 2005

Re: Number Rounding

Yep, you can use decimal format, or the Math.round(), but you'll be satisfied with the DecimalFormat class.

server_crash

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Postaholic

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since Jun 2004

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Mar 14th, 2005

Re: Number Rounding

Java Syntax (Toggle Plain Text)
import java.text.DecimalFormat; 
 
public class DecimalTest 
{
	public static void main(String[] args) 
	{
		DecimalFormat dfMoney = new DecimalFormat("$###.##");
		DecimalFormat df2 = new DecimalFormat("###.##");
		DecimalFormat df3 = new DecimalFormat("###.###");
		DecimalFormat df4 = new DecimalFormat("###.####");
 
		System.out.println(dfMoney.format(294.489003));
		System.out.println(df2.format(294.489003));
		System.out.println(df3.format(5935.393432));
		System.out.println(df4.format(1323.23423));
 
	}
}
import java.text.DecimalFormat; 

public class DecimalTest 
{
	public static void main(String[] args) 
	{
		DecimalFormat dfMoney = new DecimalFormat("$###.##");
		DecimalFormat df2 = new DecimalFormat("###.##");
		DecimalFormat df3 = new DecimalFormat("###.###");
		DecimalFormat df4 = new DecimalFormat("###.####");

		System.out.println(dfMoney.format(294.489003));
		System.out.println(df2.format(294.489003));
		System.out.println(df3.format(5935.393432));
		System.out.println(df4.format(1323.23423));

	}
}

Here is the output:
$294.49
294.49
5935.393
1323.2342

paradox814

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Posting Whiz

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