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?

Answer 1

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.

Answer 2

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.