Optimize JavaStream

[akiradeveloper]

Using a scanner like this will actually improve the performance (All bench completes about 100ms) but it is not a normal way. Can we do the same thing with the standard library?

class FastScanner \{
    BufferedReader br;
    StringTokenizer st;

    public FastScanner(String s) \{
        try \{
            br = new BufferedReader(new FileReader(s));
        } catch (FileNotFoundException e) \{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public FastScanner() \{
        br = new BufferedReader(new InputStreamReader(System.in));
    }

    String nextToken() \{
        while (st == null || !st.hasMoreElements()) \{
            try \{
                st = new StringTokenizer(br.readLine());
            } catch (IOException e) \{
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }

    String next() \{
        return nextToken();
    }

    int nextInt() \{
        return Integer.parseInt(nextToken());
    }

    long nextLong() \{
        return Long.parseLong(nextToken());
    }

    double nextDouble() \{
        return Double.parseDouble(nextToken());
    }
}