convert String to double with '%'

Question

I have a String value like "1.22%". I want to convert this to double value. Douboe.parseDouble throws numberFormatException.

String s = "1.22%";
 double iRate;

iRate = Double.parseDouble(s);

Answer 1

One-liner using DecimalFormat :

double d = new DecimalFormat("0.0#%").parse("1.22%").doubleValue(); 
// d = 0.0122

Answer 2

You want to use a method similar to the one below:

public static double ConvertPercentageStringToDouble(this string value)
{
   return double.Parse(value.Replace("%","")) / 100;
}

Answer 3

Assuming you have standard format. You can try

String s = "1.22%";
s = s.replaceAll("%","");
double iRate= Double.parseDouble(s);

Answer 4

The better way to do this is using DecimalFormatSymbols , which can help you to define what is simbols and what is really numbers to transform into Double.

See the example below:

    String s = "1.22%";

    DecimalFormat df = new DecimalFormat();
    DecimalFormatSymbols symbols = new DecimalFormatSymbols();
    symbols.setDecimalSeparator('.');
    symbols.setGroupingSeparator(' ');
    symbols.setPercent('%');
    df.setDecimalFormatSymbols(symbols);
    Number parse = df.parse(s);

    Double myDouble = parse.doubleValue();

    System.out.println(myDouble);