Как найти самое длинное и самое короткое предложение в строке

Как найти самое длинное и самое короткое предложение в строке s без использования split(), ArrayList и так далее. В данном коде я уже нашел количество слов, среднее количество слов, самое длинное и самое короткое слово, количество предложений и среднее число слов в предложении. Заранее спасибо.

Вот мой код на данный момент:

class stringManipulation{
public static void main(String[] args){
    String s = "A stray Lamb stood drinking early one morning on the bank of a woodland stream."+
    " That very same morning a hungry Wolf came by farther up the stream, hunting for something to"+
    " eat. He soon got his eyes on the Lamb. As a rule Mr. Wolf snapped up such delicious morsels "+
    "without making any bones about it, but this Lamb looked so very helpless and innocent that the "+
    "Wolf felt he ought to have some kind of an excuse for taking its life. \"How dare you paddle "+
    "around in my stream and stir up all the mud!\" he shouted fiercely. \"You deserve to be "+
    "punished severely for your rashness!\" \"But, your highness,\" replied the trembling Lamb,"+
    "\"do not be angry! I cannot possibly muddy the water you are drinking up there. Remember, "+
    "you are upstream and I am downstream.\" \"You do muddy it!\" retorted the Wolf savagely. \""+
    "And besides, I have heard that you told lies about me last year!\" \"How could I have "+
    "done so?\" pleaded the Lamb. \"I wasn't born until this year.\" \"If it wasn't you, "+
    "it was your brother!\" \"I have no brothers.\" \"Well, then,\" snarled the Wolf, \"It "+
    "was someone in your family anyway. But no matter who it was, I do not intend to be "+
    "talked out of my breakfast.\" And without more words the Wolf seized the poor Lamb "+
    "and carried her off to the forest.";

    int counter = 0;
    double spaces = 1;
    int stringLength = s.length();
    String store = "";
    String longestWord = "";
    String shortestWord = "";
    int l = 0;
    /*String symbols = ".,?!";*/
    int sentences = 0;
    String longestSentence = "";
    while(counter < s.length()){
        char c = s.charAt(counter);
        if(c == '.'){
            sentences++;
        }
        if(c == ' '){
            spaces++;
        }
        if(c != ' '){
            store = store + c;
        } 
        else{
            if(store.length() > longestWord.length()){
                longestWord = store;
            }
            l = store.length();
            if(l < stringLength){
                stringLength = l;
                shortestWord = store;
            }
            store = "";
        } 
        counter++;
    }
    double average = ((counter - spaces) / spaces);
    System.out.println(spaces + " words in a string");
    System.out.println(average + " is the average word length");
    System.out.println((counter-spaces) + " characters without spaces");
    System.out.println("Longest word: " + longestWord.length() + " character(s) " + "( " + longestWord + " )");
    System.out.println("Shortest word: " + shortestWord.length() + " character(s) " + "( " + shortestWord + " )");
    System.out.println(sentences + " sentences");
    System.out.println("The average sentence length: " + spaces / sentences + " words");
    /*System.out.println("Longest sentence: " + longestSentence);*/
}

}