How to pick up only integer data from an ArrayList of String

Question

I read a text file and put the data into an ArrayList of String.

The data is like

China 12351235123 Korea 123532523 USA 1234123         


        

Answer 1

You can use Regex as SLY suggested, or you can go over your list and split the object into two parts: 'country' and 'number' using:

for(String s : array){
    String[] parts = s.split(" ");
    long number = Long.parseLong(parts[1]);
    System.out.println(number);
}

NOTE: the invariant is that each element contains two parts with the delimiter 'white space', and the second part is a number.