Program that compares counting words in files using an ArrayList and a Map.
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;
}
}
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