Faster file/keyboard input reader that allows for the ease of use of Scanner coupled with the efficiency of BufferedReaders and StringTokenizers.

FastReader.java

import java.io.*;
import java.util.InputMismatchException;
import java.util.StringTokenizer;

public final class FastReader {

    private BufferedReader bufferedReader;
    private StringTokenizer stringTokenizer;

    public FastReader() {
        bufferedReader = new BufferedReader(new InputStreamReader(System.in));
    }

    public FastReader(String fileName) {
        try {
            bufferedReader = new BufferedReader(new FileReader(fileName));
        } catch (FileNotFoundException fnfe) {
            fnfe.printStackTrace();
        }
    }

    public String next() {
        while (stringTokenizer == null || !stringTokenizer.hasMoreElements()) {
            try {
                stringTokenizer = new StringTokenizer(bufferedReader.readLine());
            } catch (IOException ie) {
                ie.printStackTrace();
            } catch (NullPointerException npe) {
                return null;
            }
        }
        return stringTokenizer.nextToken();
    }

    public int nextInt() {
        try {
            return Integer.parseInt(next());
        } catch (NumberFormatException nfe) {
            throw new InputMismatchException(nfe.getMessage());
        }
    }

    public String nextLine() {
        String line = "";
        try {
            line = bufferedReader.readLine();
        } catch (IOException ie) {
            ie.printStackTrace();
        }
        return line;
    }

    public boolean hasNextLine() {
        return hasNextString(nextLine());
    }

    public boolean hasNext() {
        return hasNextString(next());
    }
    
    private boolean hasNextString(String input) {
        if (input != null) {
            stringTokenizer = new StringTokenizer(input);
            return true;
        }
        return false;
    }

    public boolean hasNextInt() {
        String next = next();
        if (next != null) {
            stringTokenizer = new StringTokenizer(next);
            try {
                Integer.parseInt(next);
                return true;
            } catch (NumberFormatException nfe) {
                return false;
            }
        }
        return false;
    }
}