StringTokenizer - reading lines with integers

Question

I have a question about optimization of my code (which works but is too slow...). I am reading an input in a form

X1 Y1
X2 Y2
etc

where Xi,

Answer 1

You could use regex to check if the value is numerical and then convert to integer:

if(st.nextToken().matches("^[0-9]+$"))
        {
           int x = Integer.parseInt(st.nextToken());
        }