What's the fastest way to read from System.in in Java?

Question

I am reading bunch of integers separated by space or newlines from the standard in using Scanner(System.in).

Is there any faster way of doing this in Ja

Answer 1

StringTokenizer is a much faster way of reading string input separated by tokens.

Check below example to read a string of integers separated by space and store in arraylist,

String str = input.readLine(); //read string of integers using BufferedReader e.g. "1 2 3 4"
List list = new ArrayList<>();
StringTokenizer st = new StringTokenizer(str, " ");
while (st.hasMoreTokens()) {
    list.add(Integer.parseInt(st.nextToken()));
}