oop-labs-collection/labs/5/Sentence.java

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Sentence {
    private Word[] words;
    private Symbol ending;

    public Sentence(Word[] words, Symbol ending) {
        this.words = words;
    }

    public Sentence(Word[] words) {
        this.words = words;
    }

    public Sentence(String sentence) {
        int totalSentenceLength = sentence.length();
        this.ending = new Symbol(sentence.charAt(totalSentenceLength-1));

        String[] rawWords = sentence.substring(0, totalSentenceLength-1)
                                        .split("(?<=[,;:]?) ");

        Word[] preparedWords = new Word[rawWords.length];

        for (int i = 0; i < rawWords.length; i++) {
            preparedWords[i] = new Word(rawWords[i]);
        }

        this.words = preparedWords;
    }
    
    public void addWord(Word newWord) {
        Word[] newWordArray = new Word[1];
        newWordArray[0] = newWord;
        addWords(newWordArray);
    }

    public void addWords(Word[] newWords) {
        int currentWordsAmount = this.words.length;
        int newWordsAmount = newWords.length;
        int totalLength = currentWordsAmount + newWordsAmount;

        Word[] updatedWords = new Word[currentWordsAmount + newWordsAmount];

        for (int i = 0; i < currentWordsAmount; i++) {
            updatedWords[i] = this.words[i];
        }

        for (int i = 0; i < newWordsAmount; i++) {
            updatedWords[currentWordsAmount+i] = newWords[i];
        }
        
        this.words = updatedWords;
    }

    public int index(Word w) {
        int wordIndex = -1;

        for (int i = 0; i < this.words.length; i++) {
            if (this.words[i].equals(w)) {
                wordIndex = i;
                break;
            }
        }

        return wordIndex;
    }

    public void removeWord(Word w) {
        int deleteIndex = index(w);
        removeWord(deleteIndex);
    }

    public void removeWord(int deleteIndex) {
        // first pass, lookup
        Word[] updatedArray = new Word[this.words.length-1];

        for (int i = 0; i < deleteIndex; i++) {
            updatedArray[i] = this.words[i];
        }

        for (int i = 0; i < this.words.length - deleteIndex - 2; i++) {
            updatedArray[deleteIndex+i] = this.words[deleteIndex+i+1];
        }

        this.words = updatedArray;
    }

    public String toString() {
        String result = "";

        for (Word i : this.words) {
            result += i.toString() + " ";
        }
        
        return result.substring(0, result.length()-1) + this.ending.toString();
        //return result;
    }
}