Exception while trying to convert String value to Double in Java

Question

I am getting the below error when trying to convert string to double.

For input string: "1,514,230.15"

Exception:
java.lang.NumberFormatException: For input string: "1,514,230.15"
    at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
    at sun.misc.FloatingDecimal.parseDouble(Unknown Source)
    at java.lang.Double.parseDouble(Unknown Source)

This is the line of code I am using

 testString = "1,514,230.15"
 double d= Double.parseDouble(TestString);

Can someone help me understand what I am doing wrong here?

You can't have commas if you're directly doing `Double.parseDouble`, since you don't put commas in doubles in Java source code either — user, Jun 12 '20 at 19:44
Possibly related: [How to change the decimal separator of DecimalFormat from comma to dot/point?](https://stackoverflow.com/q/5054132) (then you can use those formats like `df.parse(stringRepresentingFormattedDouble).doubleValue()`). — Pshemo, Jun 12 '20 at 20:07

Nitin Bisht · Accepted Answer · 2020-06-13T14:06:21.897

3

Solution 1:

String testString = "1,514,230.15".replace(",", "");
double d = Double.parseDouble(testString);
System.out.println(d);

Or Solution 2:

String input = "1,514,230.15";
NumberFormat numberFormat = NumberFormat.getInstance(Locale.US);
double result = numberFormat.parse(input).doubleValue();
System.out.println(result);

Or Solution 3:

String testString = "1514230.15";
double d= Double.parseDouble(testString);
System.out.println(d);

Output:

1514230.15

Explanation:

In solution 1 used replace method to replace all , i.e. replace(",", "");
In solution 2 used NumberFormat. This class provides the interface for formatting and parsing numbers.
In solution 3 removed all , from testString i.e. String testString = "1514230.15";

edited Jun 13 '20 at 14:06

answered Jun 12 '20 at 19:47

Nitin Bisht

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It is worth explaining *why* NumberFormat.parse is different from Double.parseDouble: NumberFormat is intended for *human readable* numbers as they would be presented to end users, like the string in the original question; Double.parseDouble is intended for *code formatted* numbers, that is, numeric values as they would appear in Java code. – VGR Jun 13 '20 at 18:08
Moreover, you stealthily copied [my solution](https://stackoverflow.com/a/62351764/10819573) and put that as one of your options. Whenever you copy someone's solution, do it with citation. – Arvind Kumar Avinash Jun 16 '20 at 20:08

Arvind Kumar Avinash · Answer 2 · 2020-06-12T20:17:30.657

You should use NumberFormat#prase which is specialized for such conversions. Your input string complies with the number format for Locale.US.

import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Locale;

public class Main {
    public static void main(String[] args) throws ParseException {
        String input = "1,514,230.15";
        NumberFormat numberFormat = NumberFormat.getInstance(Locale.US);
        double n = numberFormat.parse(input).doubleValue();
        System.out.println(n);
    }
}

Output:

1514230.15

Exception while trying to convert String value to Double in Java

2 Answers2