java数据转换

数据格式化

import java.text.NumberFormat;
//百分号格式化
    public static void main(String[] args) {
        NumberFormat percentFormat = NumberFormat.getPercentInstance();
        percentFormat.setMaximumFractionDigits(3);
         Number rate = tal.get() == 0 ? 0 : BigDecimal.valueOf((double) on.get() / tal.get()).setScale(5, BigDecimal.ROUND_HALF_UP);
        System.out.println(percentFormat.format(0));
    }