First, launch NetBeans and close any previous projects that may be open (at the top menu go to File ==> Close All Projects). Then create a new Java application called "LetterCount" (without the quotation marks) according to the following guidelines. You are going to write a program that reads a txt file and reports what the most common letter in a different txt file. The program needs to count all the letters so that lowercase letters are counted the same way as uppercase letters. For example, A and a would count towards the same letter. A sample outline is: //Establish fileName, the String that is "data. txt" //Go through file and count the amount of letters in an array //Find the index of the largest value //Determine all the letters that were used the most and store as a Character ArrayList

See explaination

Explanation:

// LetterCount.java

import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.NoSuchElementException;

import java.util.Scanner;

public class LetterCount {

public static void main(String[] args) {

// setting up a Scanner to read from keyboard

Scanner scanner = new Scanner(System.in);

try {

// asking and reading input file name

System.out.print("Enter name of input file: ");

String file = scanner.nextLine();

// reinitializing scanner to read from input file. this will throw

// file not found exception if file is not found.

scanner = new Scanner(new File(file));

// opening a file writer to create and write into output.txt file

PrintWriter writer = new PrintWriter(new File("output.txt"));

// creating a String containing all 26 alphabets

String alphabet = "";

// creating an array containing 26 integers, all initialized to 0

int counts[] = new int[26];

// looping through the file

while (scanner.hasNext()) {

// reading next line, converting to lower case

String word = scanner.next().toLowerCase();

// looping through each character in current word

for (char c : word.toCharArray()) {

// finding index of c in alphabet

int index = alphabet.indexOf(c);

// if c is an alphabet, the index value will not be -1

if (index != -1) {

// incrementing counter at index position

counts[index]++;

}

}

}

// closing input file

scanner.close();

int largestCount = 0; // to store largest count of a character

String mostCommon = ""; // to store the character(s) that occur the

// most

// looping through counts array, finding the largest value

for (int i = 0; i < counts.length; i++) {

if (counts[i] > largestCount) {

// updating largestCount and mostCommon

largestCount = counts[i];

mostCommon = alphabet.charAt(i) + "";

} else if (counts[i] == largestCount) {

// same largest count, appending to mostCommon string

mostCommon += " " + alphabet.charAt(i);

}

}

// writing results to output file

writer.println("The most common letter(s): " + mostCommon);

writer.println("Count of occurrances: " + largestCount);

// closing file, saving changes, alerting user

writer.close();

System.out

.println("done! please check output.txt file for results.");

} catch (IOException e) {

// will be executed when the input/output file cant be opened or

// found, or if there is an error while reading the file

System.out.println(e.getMessage());

} catch (NoSuchElementException e) {

// will occur when there is no input provided for input file name.

System.out.println("No input!");

}

}

}

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