FileLetterCounter

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;

public class FileLetterCounter
{
    private static String ALPHAS = "abcdefghijklmnopqustuvwxyz";

    public static void main(String args[] ) {
        // get name of input file from user
        Scanner keyboard = new Scanner( System.in );
        System.out.print( "Please enter the name of a file: " );
        String nameOfFile = keyboard.next();

        // try to open file for reading
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(
                new InputStreamReader( new FileInputStream( new File( nameOfFile )))
            );
        } catch ( FileNotFoundException e ) {
            System.out.println( "sorry - no such file as: " + nameOfFile );
            return;
        }

        String line;            // to capture each line of file
        int[] counts = new int[26]; // to hold counts of letters (alphabetic characters)
        try {
            // for as long as there is content in the file...
            while( null != (line = reader.readLine()) ) {
                counts = doCounts( line, counts);
            }
        } catch ( IOException e ) {
            System.out.println( "sorry - error reading file: " + nameOfFile +
                    "reported error was:\n\n" + e.toString() );
            return;
        }
        print( counts );

    }
    public static int[] doCounts( String line, int[] counts) {
        for (int i = 0; i < ALPHAS.length(); i++) {
            counts[ i ] += line.toLowerCase( ).replaceAll( "[^"+ ALPHAS.charAt( i ) +
                "]", "").length( );
        }
        return counts;
    }
    public static void print( int[] counts ) {
        for (int i = 0; i < ALPHAS.length(); i++) {
            System.out.println( ALPHAS.charAt( i ) + ": " + counts[ i ]);
        }

    }
}