In Java, how do you parse a a string into a number with a value?

Question

I'm making a program that takes the users input as a string. Within that string, if i know the position of where the number is, how do i separate the number with its value saved as a variable?

Answer 1

int newValue = Integer.ParseInt(string.substring(begin, end));

begin is the position where the number begins. end is the position where it ends. Note that the first character is 0, second is 1, nth is n-1, etc, etc.-

You can also get a double:

double newValue = Double.ParseDouble(string.substring(begin, end));

Answer 2

You need to get the integer part out of the string using regex "[\\D]" and then convert the integer string to int value. Something like :

try {
int val = Integer.parseInt(strValue.replaceAll("[\\D]", ""));

} catch(NumberFormatException nfe) {

}