Numerics to a String

[Rick Rodriguez]

Anyone,
I know that there are ways/methods that convert a "string" to a "numeric/double/int/etc.", however is there a way to convert a numberic to a string?
The reason that I ask is because I am wanting to "truncate" the value of a double variable. Unlike C/C++, I cannot use "precision" with some type of conversion specifier to do this.
I was thinking about converting the double to a string and outputting only the digits that I want displayed, in effect, truncating the variable's value.
Any feedback would be welcomed. Thanks in advance.

[Manju Jain]

Try valueOf method in String class [ it gives string representation of int , float etc. ] Then, use the subString method to extract the value upto a point you desire.
Hope this helps.
jytsika

[Art Metzer]

Hi, Rick.
I'd recommend that you investigate java.text.DecimalFormat. You can use this class to specify how you'd like your double to be displayed. DecimalFormat's format() method requires that not only the double, but also a StringBuffer and FieldPosition be passed.
To wit:

import java.text.*;
 
public class DoubleFormatter {
 
    public static void main( String[] args ) {
 
        DecimalFormat df = new DecimalFormat( "###,###,##0.00" );
 
        double testDouble = 876543.219;
        StringBuffer result = new StringBuffer();
        FieldPosition fp = new FieldPosition( 0 );
 
        System.out.println( df.format( testDouble, result, fp ).toString() );
    }
}

This code returns

<font size="2.0">
876,543.22

Good luck, Rick.
Art

[Lucas Richardson]

The toString() method also works.

[Roy Tock]

Rick, if you just need to truncate, then casting the double to an int will do it.
Try this:

public class Trial
{
    public static void main( String[] args )
    {
        double d = 2.75;
        int i = (int)d;
        System.out.println( i );
    }
}

It prints 2.