Java

Number Rounding

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Join Date: Jan 2005

Posts: 31

Reputation: AQWst is an unknown quantity at this point

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AQWst

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Light Poster

Number Rounding

Mar 13th, 2005

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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Join Date: Nov 2004

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jwenting

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duckman

Re: Number Rounding

Mar 14th, 2005

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.

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Join Date: Jun 2004

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Postaholic

Re: Number Rounding

Mar 14th, 2005

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

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Join Date: Oct 2004

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Posting Whiz

Re: Number Rounding

Mar 14th, 2005

 Help with Code Tags 
 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));

	}
}