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When you need to format a number as a percent you can use the ‘%’ symbol in your DecimalFormat string. The static helper method getPercentInstance() can also be used if you don’t need complete control over the format string.

When the % symbol is used the value is first multiplied by 100 before applying the format string. So 0.123 would become 12.3%.

NumberFormat format1 = new DecimalFormat("##.####%");
NumberFormat format2 = NumberFormat.getPercentInstance();

String formatted1 = format1.format(value);
String formatted2 = format2.format(value);

written by objects \\ tags: BigDecimal, DecimalFormat, double, float, format, NumberFormat, percent