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Decimal format uses BigDecimal.ROUND_HALF_EVEN and prior to 1.6 this cannot be changed.
In 1.6 a setRoundingMethod() was added to allow the rounding strategy to be changed.

DecimalFormat df = NumberFormat.getNumberInstance();
df.setRoundingMode(1, RoundingMode.HALF_UP);
String formatted = df.format(12.345);

If you need an alternate rounding strategy prior to 1.6 then you need to use BigDecimal to do your formatting.

double d = 123.45;
BigDecimal bd = new BigDecimal(d);
bd.setScale(1, BigDecimal.ROUND_HALF_UP);
String formatted = bd.toString();

written by objects \\ tags: BigDecimal, conversion, DecimalFormat, format, rounding