formatNum static method
小数点后保留几位小数
Implementation
static String formatNum(double num, int position) {
if ((num.toString().length - num.toString().lastIndexOf(".") - 1) <
position) {
return num.toStringAsFixed(position)
.substring(0, num.toString().lastIndexOf(".") + position + 1)
.toString();
} else {
return num.toString()
.substring(0, num.toString().lastIndexOf(".") + position + 1)
.toString();
}
}