java - Add 0 to end if number is like $12.5 -

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possible duplicate:
usd currency formatting in java

all- have small problem in app outputs answer after inputs go through equation , rounded 2 decimal places after decimal point. problem if number comes out $12.80 output looks $12.8. want $12.80. not biggest deal in final stages of development , clean nice. here of code: 

    float result2 = result / l3;      double data2 = result2;       int decimalplaces2 = 2;     double roundbase2 = math.pow(10, decimalplaces2);     data2 = (double)(math.round(data2 * roundbase2)) / roundbase2;      answer.settext("$" + double.tostring(data2));

thanks time!

decimalformat format = new decimalformat("$#"); format.setminimumfractiondigits(2); answer.settext(format.format(data2));

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