import java.util.ArrayList;public class Lab05 { public static void main(String [] args) { String[] strings = createStringArray(); ArrayList words = stringsToWords(strings); printWordList(words); System.out.println("Average word length: " + averageWordLength(words)); System.out.println("\nEnd of processing."); } public static String[] createStringArray() { // Unusual construction! See the course notes for an example. return new String[] { "O my Luve's like a red, red rose, That's newly sprung in June.", "O my Luve's like the melodie, That's sweetly play'd in tune.", "As fair art thou, my bonie lass, So deep in luve", "am I; And I will luve thee still, my dear, Till a' the seas gang dry." }; } public static ArrayList stringsToWords(String[] s) { ArrayList result = new ArrayList(); Word w; String[] tokens; for (int i = 0; i < s.length; i++) { tokens = s[i].split("\\s+"); for (int j = 0; j < tokens.length; j++) { w = findWord(result, tokens[j]); if (w == null) result.add(new Word(tokens[j])); else System.out.println("you should add something here to add the frequency by one."); } } return result; } // Exercise 1: linear search for a word in the array list public static Word findWord(ArrayList words, String word) { for (int i = 0; i < words.size(); i++) { //quite confused here... if ( ((Word)(words.get(i))).compare() ) return words(i); } return null; } public static void printWordList(ArrayList words) { for (int i = 0; i < words.size(); i++) System.out.println(words.get(i)); } public static double averageWordLength(ArrayList words) { int total = 0; for (int i = 0; i < words.size(); i++) { // Exercise #2: This doesn't work - fix it! // total += words.get(i).countLetters(); } return (double)total / words.size(); }}class Word { private String word; private int frequency; public Word(String w) { word = w; frequency = 1; } public void addFreq () { frequency++; } //Not familiar enough to understand here... public boolean compare () { if ( this.word == word ) { return true; } return false; } public int countCharacters() { return word.length(); } // Exercise 1: Add methods to this class public int countLetters() { int count = 0; for (int i = 0; i < word.length(); i++) { if (Character.isLetter(word.charAt(i))) count++; } return count; } public String toString() { return "Word: '" + word + "' frequency: " + frequency + " length: " + countLetters(); }}