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Wednesday, 14 December 2016

Chapter 12 Exercise 19, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

12.19 (Count words)
Write a program that counts the number of words in President Abraham Lincoln’s
Gettysburg address from http://cs.armstrong.edu/liang/data/Lincoln.txt.

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Scanner;

public class Exercise_19 {

    public static void main(String[] args) {

        System.out.println("Connecting to http://cs.armstrong.edu/liang/data/Lincoln.txt");
        URL url = null;
        try {
            url = new URL("http://cs.armstrong.edu/liang/data/Lincoln.txt");
        } catch (MalformedURLException ex) {
            System.out.println("Invalid url: " + ex.getMessage());
            ex.printStackTrace();
            System.exit(1);
        }

        int wordCount = 0;
        String s = "";
        try (Scanner input = new Scanner(url.openStream())) {

            while (input.hasNext()) {
                s += input.nextLine();
            }

        } catch (IOException ex) {
            ex.printStackTrace();
        }
        String[] words = s.split("[ ,.]", 0);
        words = removeEmptyStrings(words);
        System.out.println("Total word count = " + words.length);



    }

    private static String[] removeEmptyStrings(String[] words) {

        ArrayList<String> modifiedWords = new ArrayList<>();
        for (int i = 0; i < words.length; i++) {
            if (words[i].length() != 0) {
                modifiedWords.add(words[i]);
            }
        }

        return modifiedWords.toArray(new String[modifiedWords.size()]);
    }




}

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