JAVA: How do you convert a String variable to a Double variable?

Question

I'm writing a program that is dealing with about 150 different variables, which I have extracted off a webpage. I was looking at how to change them into a double variable, so that I can compare them later in the program, and found this code to do so:

String text = "12.34"; // example String
double value = Double.parseDouble(text);

This works fine for some of them, but a lot of the numbers that I'm extracting from the webpage as a String variable come in the form '1,200.000', with the comma (,) to separate the number into thousands.

As a result, the program will not allow me to run the above code on them, because of that comma (,). How do I get rid of the comma, and hence change these Strings, like 1,200.000, into a double variable, like 1200.000?

You need locale aware parsing. See stackoverflow.com/questions/888088/… — Jayan
– Jayan, Commented Nov 15, 2014 at 11:53

Maarten Bodewes · Accepted Answer · 2014-11-15 12:11:55Z

2

You can easily get rid of the comma :

double value = Double.parseDouble(text.replace(",",""));

Note that this will only work if comma's are used for the thousand separator. Other locales may switch the command and dot around.

edited Nov 15, 2014 at 12:11

Maarten Bodewes

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answered Nov 15, 2014 at 11:53

Eran

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3 Comments

user296950 Over a year ago

Will I be able to use that even if some of the numbers do not have commas, or will it return an error?

Maarten Bodewes Over a year ago

@Eran In French (and most of EU if I'm not mistaken) the thousand separator and the decimal separator are switched.

Eran Over a year ago

@owlstead What makes you think the OP cares about French locale? They only asked about getting rid of the comma.

Maarten Bodewes · Accepted Answer · 2014-11-15 12:19:36Z

0

First just delete the commas from the String and then parse it into Double:

String text = text.replace(",", "");
double val = Double.parseDouble(text);

Note that this will only work if comma's are used for the thousand separator. Other locales may switch the command and dot around.

edited Nov 15, 2014 at 12:19

Maarten Bodewes

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answered Nov 15, 2014 at 11:56

Jilberta

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