DecimalFormat : replace floats with spaces - decimalformat

Question

We need to display currency amounts in a browser table and since those are numbers, they should be right aligned.
Problem is with currencies like Japan which do not have floating point currencies.
So for them, we cannot show 5.10 Yen
Now, the requirement is to show something like this:
(Note the alignment and the mixing of decimal currencies with non-decimal)
5.23
12.00
3.24
5
9
11.00
In the above, 5 and 9 are Japanese Yens while others are USD
So the requirement is to replace floating points with spaces for currencies like JPY. Spaces are required to have proper alignment of the currencies.
Offcourse, for other currencies, the 2 decimal places should be there.
Does anyone know how the above can be done?
Thanks a lot in advance!!
Based on the below replies:
1) The values are sent from a Java server and fed into a JavaScript library SlickGrid
2) We want to control values at the server level because the SlickGrid code is not very amenable for this kind of work.
3) Currencies are being stored as floats because customer wants to see them that way :( and that's kind of correct because mostly people are bothered about dollars not cents, but then, some people are concerned about cents too.
I was really hoping of some option with DecimalFormat only as that would have been the best solution.
Else I would have to resort to the ugly solution of parsing and string massaging.

Answer 1

Currency should never be stored as a floating point number. It should always be integer amounts of the lowest denomination you are working with (Yen, Cents, Paise).
If you need to work with amounts smaller than the lowest natural denomination, store currency as integer amounts representing multiples of a specified fraction. For example 6 tenths of a Yen.
As for the formatting, there is a discussion of simple options here.

Answer 2

following CSS is basically taken from the link in jsj's answer (extracting the most relevant portion)
HTML only version:
td { font-family: monospace; }
span.int {
text-align: right;
float: left;
width: 3em;
}
span.fractional {
text-align: left;
float: right;
width: 2em;
}
<table>
<tr><td><span class="int">5</span><span class="fractional">.23</span></td></tr>
<tr><td><span class="int">12</span><span class="fractional">.00</span></td></tr>
<tr><td><span class="int">3</span><span class="fractional">.24</span></td></tr>
<tr><td><span class="int">5</span><span class="fractional"></span></td></tr>
<tr><td><span class="int">9</span><span class="fractional"></span></td></tr>
<tr><td><span class="int">11</span><span class="fractional">.00</span></td></tr>
</table>
JavaScript version:
function spanInt(content){ var span = document.createElement('span');span.className = 'int'; span.textContent = content; return span; }
function spanFractional(content){ var span = document.createElement('span'); span.className = 'fractional'; span.textContent = content; return span;}
function tableCell_int(value){
var td = document.createElement('td');
td.appendChild(spanInt(value));
td.appendChild(spanFractional(''));
return td;
}
function tableCell_float(value){
var intPart = Math.floor(value);
var fracPart = value - intPart;
var td = document.createElement('td');
td.appendChild(spanInt(intPart));
td.appendChild(spanFractional('.' + Math.round(100*fracPart)));
return td;
}
function tr(cell){
var elt = document.createElement('tr');
elt.appendChild(cell);
return elt;
}
var theTable = document.getElementById('theTable');
function add_int(value){ theTable.appendChild(tr(tableCell_int(value))); }
function add_float(value){ theTable.appendChild(tr(tableCell_float(value))); }
add_float(5.23); add_float(12); add_float(3.24);
add_int(5); add_int(9); add_float(11);
td { font-family: monospace; }
span.int {
text-align: right;
float: left;
width: 3em;
}
span.fractional {
text-align: left;
float: right;
width: 2em;
}
<table id='theTable'></table>