How can I print a double value 0.0 to 0.00?

Posted on 2006-03-29
Medium Priority
Last Modified: 2012-05-05

I am trying to print a string value to Double .But i need to print in different format..

I have used the following code

String s1 = "2"
String s2 = ".1"
Double d1 = new Double(s1);
Double d2 = new Double(s2);
System.out.println("First double"+d1+"### Second double "+d2);

Its pirnting
 FirstDouble 2 ### Second double 0.1.

But i want it be printed as
d1 as 2.00 and  d2 as 0.10

How can it be possible?


Question by:vijayam
LVL 92

Expert Comment

ID: 16319291
NumberFormat nf = new DecimalFormat("0.00");
s1 = nf.format(d1.doubleValue());
LVL 92

Expert Comment

ID: 16319296
LVL 86

Accepted Solution

CEHJ earned 128 total points
ID: 16319307
System.out.printf("%.2f\n", d2.doubleValue());
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Author Comment

ID: 16319393
I am getting the output,but it is as string but i need it as Double.

DecimalFormat df  = new DecimalFormat("0.00");
FieldPosition fp = new FieldPosition (NumberFormat.INTEGER_FIELD);
StringBuffer sb= new StringBuffer();
sb = df.format( d1 , sb, fp );

then its printing sb as 2.00

But i need it to be as Double  that's why  i coverted this to string and parsed..as

Double dd = new Double(sb.toString());

then its printing,same 2 again...what should i do,if i want to print 2.00 as Double object.

LVL 86

Expert Comment

ID: 16319422
The representation of an object, when materialized as a String, has a varying relation to its binary content. In the case of numbers, or object wrappers of numbers, the binary form is, and should be, distinct and different
LVL 92

Assisted Solution

objects earned 124 total points
ID: 16319423
doubles are floating point values, you cannot format them directly.
you format them in a string as required

System.out.println("First double"+nf.format(d1.doubleValue())+"### Second double "+nf.format(d2.doubleValue()));
LVL 30

Assisted Solution

by:Mayank S
Mayank S earned 124 total points
ID: 16319444
A double/ Double holds the *value*, not the *format*.
LVL 37

Assisted Solution

zzynx earned 124 total points
ID: 16320038
>> A double/ Double holds the *value*, not the *format*.

>> But i need it to be as Double
That's the value
>> then its printing,same 2 again
That's the format

Your request is like saying I have this

      int i = 2;

and I want it to be 0002 instead of 2.

2 is the value, 0002 is the format, just a representation.
Your Double is 2.0, how you represent it is your choice.

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