Make sure to read the instructions!

Please help me complete my Java assignment by improving my code with the following instructions (Please provide full code for copy and paste):

Modify your Poetry.java file to do the following: If the letter is coded to a vowel, make it a capital letter. Write your new encoded poem to a text file called capitalVowels.txt. Take capitalVowels.txt and reverse the characters of each line of the file Then, decode the text back to its original letters Finally, write this text to a new file called reversePoem.txt. Make sure that the capitalised vowels go back to their original letters! Compile, save and run your file.

Here is my code:

import java.io.File;

import java.io.FileNotFoundException;

import java.io.PrintWriter;

import java.util.ArrayList;

import java.util.Scanner;

public class Poetry {

public static boolean isCharacterALetter(char c) {

return Character.isLetter(c);

}

public static ArrayList toAscii(String str) {

int i = 0;

ArrayList asciiArr = new ArrayList();

int nextAscii = 0;

while (i < str.length()) {

if (isCharacterALetter(str.charAt(i))) {

nextAscii = (int) str.charAt(i);

asciiArr.add(nextAscii);

} else {

asciiArr.add((int) str.charAt(i));

}

i++;

}

return asciiArr;

}

public static ArrayList encode(ArrayList arr) {

int i = 0;

ArrayList encodedArr = new ArrayList();

while (i < arr.size()) {

if (isCharacterALetter((char) arr.get(i).intValue())) {

if (((arr.get(i) >= 108) && (arr.get(i) <= 122)) || ((arr.get(i) >= 76) && (arr.get(i) <= 90))) {

encodedArr.add(arr.get(i) - 11);

} else {

encodedArr.add(arr.get(i) + 15);

}

} else {

encodedArr.add(arr.get(i));

}

i++;

}

return encodedArr;

}

public static String toChar(ArrayList arr) {

int i = 0;

ArrayList charArr = new ArrayList();

char nextChar;

while (i < arr.size()) {

if (isCharacterALetter((char) arr.get(i).intValue())) {

nextChar = (char) arr.get(i).intValue();

charArr.add(nextChar);

} else {

charArr.add((char) arr.get(i).intValue());

}

i++;

}

StringBuilder sb = new StringBuilder();

for (Character c : charArr) {

sb.append(c);

}

return sb.toString();

}

public static void main(String[] args) {

try {

Scanner scanner = new Scanner(new File("poem.txt"));

PrintWriter writer = new PrintWriter("encodedPoem.txt");

while (scanner.hasNextLine()) {

String line = scanner.nextLine();

ArrayList ascii = toAscii(line);

ArrayList encodedAscii = encode(ascii);

String encodedLine = toChar(encodedAscii);

writer.println(encodedLine);

}

scanner.close();

writer.close();

} catch (FileNotFoundException e) {

System.out.println("File not found.");

}

}

}