import java.io.File; import java.io.FileNotFoundException; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Scanner; import javax.swing.JFileChooser; import javax.swing.UIManager; public class WordCount { public static void main(String[] args) { countWordsViaGUI(); } // allow user to pick file to exam via GUI. // allow multiple picks public static void countWordsViaGUI() { setLookAndFeel(); try { Scanner key = new Scanner(System.in); do { System.out.println("Opening GUI to choose file."); Scanner fileScanner = new Scanner(getFile()); Stopwatch st = new Stopwatch(); st.start(); ArrayList words = countWordsWithArrayList(fileScanner); st.stop(); System.out.println("time to count: " + st); System.out.print("Enter number of words to display: "); int numWordsToShow = Integer.parseInt(key.nextLine()); showWords(words, numWordsToShow); fileScanner.close(); System.out.print("Perform another count? "); } while(key.nextLine().toLowerCase().charAt(0) == 'y'); key.close(); } catch(FileNotFoundException e) { System.out.println("Problem reading the data file. Exiting the program." + e); } } // determine distinct words in a file using an array list private static ArrayList countWordsWithArrayList(Scanner fileScanner) { System.out.println("Total number of words: " + numWords); System.out.println("number of distincy words: " + result.size()); return result; } // determine distinct words in a file and frequency of each word with a Map private static Map countWordsWithMap(Scanner fileScanner) { System.out.println("Total number of words: " + numWords); System.out.println("number of distincy words: " + result.size()); return result; } private static void showWords(ArrayList words, int numWordsToShow) { for(int i = 0; i < words.size() && i < numWordsToShow; i++) System.out.println(words.get(i)); } private static void showWords(Map words, int numWordsToShow) { } // perform a series of experiments on files. Determine average time to // count words in files of various sizes private static void performExp() { String[] smallerWorks = {"smallWords.txt", "2BR02B.txt", "Alice.txt", "SherlockHolmes.txt"};; String[] bigFile = {"ciaFactBook2008.txt"}; timingExpWithArrayList(smallerWorks, 50); timingExpWithArrayList(bigFile, 3); timingExpWithMap(smallerWorks, 50); timingExpWithMap(bigFile, 3); } // pre: titles != null, elements of titles refer to files in the // same path as this program, numExp >= 0 // read words from files and print average time to cound words. private static void timingExpWithMap(String[] titles, int numExp) { try { double[] times = new double[titles.length]; final int NUM_EXP = 50; for(int i = 0; i < NUM_EXP; i++) { for(int j = 0; j < titles.length; j++) { Scanner fileScanner = new Scanner(new File(titles[j])); Stopwatch st = new Stopwatch(); st.start(); Map words = countWordsWithMap(fileScanner); st.stop(); System.out.println(words.size()); times[j] += st.time(); fileScanner.close(); } } for(double a : times) System.out.println(a / NUM_EXP); } catch(FileNotFoundException e) { System.out.println("Problem reading the data file. Exiting the program." + e); } } // pre: titles != null, elements of titles refer to files in the // same path as this program, numExp >= 0 // read words from files and print average time to cound words. private static void timingExpWithArrayList(String[] titles, int numExp) { try { double[] times = new double[titles.length]; for(int i = 0; i < numExp; i++) { for(int j = 0; j < titles.length; j++) { Scanner fileScanner = new Scanner(new File(titles[j])); Stopwatch st = new Stopwatch(); st.start(); ArrayList words = countWordsWithArrayList(fileScanner); st.stop(); times[j] += st.time(); fileScanner.close(); } } for(int i = 0; i < titles.length; i++) System.out.println("Average time for " + titles[i] + ": " + (times[i] / numExp)); } catch(FileNotFoundException e) { System.out.println("Problem reading the data file. Exiting the program." + e); } } // try to set look and feel to same as system private static void setLookAndFeel() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch(Exception e) { System.out.println("Unable to set look at feel to local settings. " + "Continuing with default Java look and feel."); } } /** Method to choose a file using a window. * @return the file chosen by the user. Returns null if no file picked. */ private static File getFile() { // create a GUI window to pick the text to evaluate JFileChooser chooser = new JFileChooser("."); chooser.setDialogTitle("Select File To Count Words:"); int retval = chooser.showOpenDialog(null); File f =null; chooser.grabFocus(); if (retval == JFileChooser.APPROVE_OPTION) f = chooser.getSelectedFile(); return f; } }

WordCount - Program that compares counting words in files using an ArrayList and a Map.