CharsInParagraphCounter.java

/**
 * Counts chars in each sentence of a given paragraph.
 * Sentence end counts as '.', '!' or '?'.
 *
 * @return ArrayList of integers that correspond to the count of chars of each sentence in the
 * paragraph.
 */
private String countCharsInSentences(String paragraph) {
    ArrayList<Integer> charsBySentence = new ArrayList<>();
    int currentCharCount = 0;

    for (char currentCharacter : paragraph.toCharArray()) {
        if (currentCharacter == '.' || currentCharacter == '!' || currentCharacter == '?') {
            charsBySentence.add(currentCharCount);
            currentCharCount = 0;
        }

        if (Character.isLetter(currentCharacter)) {
            currentCharCount++;
        }
    }

    int temporaryMaxCharCount = 0;
    int sentenceWithMostCharsIndex = 0;

    for (int index = 0; index <= charsBySentence.size(); index++) {
        if (charsBySentence.get(index) > temporaryMaxCharCount) {
            temporaryMaxCharCount = charsBySentence.get(index);
            sentenceWithMostCharsIndex = index;
        }
    }

    return "The sentence with most words is number: " + (sentenceWithMostCharsIndex + 1) +
            "\nWith " + temporaryMaxCharCount + " words.";
}