Wsrtjtyk

I am writing a program that counts the letter frequency of a file to eventually use to help decode a different file. I am able to correctly sort the array by values (the method call i commented out) but am unable to figure out how to sort the corresponding letters with the values. Any help would be greatly appreciated.

import java.io.BufferedReader;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;



class CodeBreakerProject {



    public static void swap(int count, int index1, int index2) {

        int temp = count[index1];

        count[index1] = count[index2];

        count[index2] = temp;

    }



    public static void selectionSort(int count) {

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

            // find smallest element from i to end

            int minIndex = i; // assume 1st element is smallest

            for (int j = i; j < count.length; j++) {

                if (count[j] > count[minIndex]) {

                    minIndex = j;

                }

            }

            swap(count, i, minIndex);

        }

    }



    public static void main(String args) throws IOException {

        File file1 = new File("training.txt");

        BufferedReader in = new BufferedReader(new FileReader(file1));

        System.out.println("Letter Frequency");



        int nextChar;

        char ch;



        int count = new int[26];



        while ((nextChar = in.read()) != -1) {

            ch = ((char) nextChar);

            if (ch >= 'a' && ch <= 'z') { count[ch - 'a']++; }

        }



        //selectionSort(count); this sorts the values but does not move the letter assignments



        for (int i = 0; i < 26; i++) {

            System.out.printf("%c = %dn", i + 'A', count[i]);



        }



        in.close();

    }

}

If I understand your ultimate goal, I do not think you need to sort the array you have. The first thing you must re-think is this. Do you really need to sort this array you have that is the frequencies of the characters you have in your training text?

Your training array, again if I understand correctly, resembles something like this:

int training = new int[5];



training[0] = 1; // a

training[1] = 2; // b

training[2] = 3; // c

training[3] = 2; // d

training[4] = 8; // e

Now, in your target file, you will again collect an array like this, but this time, for example the index 0 will have the largest number, for example:

// target array:

// [8, 2, 2, 3, 1]

Now all you have to do is to replace all character a's with e's in your target file. (since you found out by seeing that it has the highest frequency, and in your training the highest frequency was letter e).

Why do you even need to sort your training array?

If I am understanding you wrong, maybe use a Map to hold your frequency values, and look for any functionality you may need in that class:

Map<Character, Integer> characterFrequency = new HashMap<>();

characterFrequency.put('a', 4);

characterFrequency.put('b', 2);