public class Test {
public static void main(String[] args) {
String result= Test.roundByScale(2.00,2);
System.out.println(result);
}
public static String roundByScale(double v,int scale) {
if (scale < 0) {
throw new IllegalArgumentException(
"The scale must be a positive integer or zero");
}
if(scale == 0){
return new DecimalFormat("0").format(v);
}
String formatStr = "0.";
for(int i=0;i<scale;i++){
formatStr = formatStr + "0";
}
return new DecimalFormat(formatStr).format(v);
}
}
