Question

Hi is there any way to parse strings into numbers? And is there any way to check if a string is a number or not without breaking the program ? I am thinking about using a try and catch would this be a good idea ?

Answer 1

There’s no way to check if a string is parseable or not without trying to parse the string (as any check would have to start trying to interpret the string as a number to do that…). For a half-way check, I guess you could use Regex to check if the string has only digits and periods. You’ll have to use a try… catch block aswell, though.

As to how to parse a string into a double, try this:

double dd;
try {
    dd = Double.parseDouble(string);
}
catch (NumberFormatException e) {
    System.out.println("couldnt not parse the string!");
}