Question

● Write a program that reads words from a text file and displays all the words (duplicates allowed) in ascending alphabetical order. The words must start with a letter. Must use ArrayList.

THE TEXT FILE CONTAINS THESE WORDS IN THIS FORMAT:

drunk
topography
microwave
accession
impressionist
cascade
payout
schooner
relationship
reprint
drunk
impressionist
schooner

THE WORDS MUST BE PRINTED ON THE ECLIPSE CONSOLE BUT PRINTED OUT ON A TEXT FILE IN ALPHABETICAL ASCENDING ORDER IS PREFERRED

THANK YOU IN ADVANCE

import java.util.ArrayList;
import java.util.Arrays;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.Collections;
import java.util.List;

public class ArrayListAscending {

   public static void main(String[] args) {
      
       try {
           File j = new File("C:\\Users\\NaharaY\\Dropbox\\Jesse -23263\\Introduction to Software Engineering\\Task 20\\words.txt");
           Scanner input = new Scanner(j);
           List<String>list = new ArrayList<String>();
           String line = "";
           while(input.hasNext()) {
               list.addAll(Arrays.asList(line.split(" ")));
           }
           Collections.sort(list);
           for(String temp:list) {
               if(temp!=null &!temp.equals(""))
                   if(Character.isLetter(temp.charAt(0)))
                       System.out.println(temp);
           }
           input.close();
       }catch(FileNotFoundException e) {
           System.out.println("Error");
       }

   }

}

Answer 1

Here is the completed code for this problem. Updated the code, so that the sorted words will be written to a file named output.txt in addition to printing to console. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

// ArrayListAscending.java

import java.util.ArrayList;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.PrintWriter;

import java.util.Scanner;

import java.util.Collections;

import java.util.List;

public class ArrayListAscending {

      public static void main(String[] args) {

            try {

                  File j = new File(

                              "C:\\Users\\NaharaY\\Dropbox\\Jesse -23263\\Introduction to Software Engineering\\Task 20\\words.txt");

                  Scanner input = new Scanner(j);

                  List<String> list = new ArrayList<String>();

                  String line = "";

                  // creating a PrintWriter object to write the output to a file named

                  // output.txt

                  PrintWriter writer = new PrintWriter(new File("output.txt"));

                  while (input.hasNext()) {

                        // reading next line

                        line = input.nextLine();

                        // splitting line by spaces to create an array of words

                        String words[] = line.split(" ");

                        // looping through each word

                        for (String word : words) {

                              // adding to list only those words which start with a letter

                              if (word.length() > 0 && Character.isLetter(word.charAt(0))) {

                                    list.add(word);

                              }

                        }

                  }

                  // sorting list

                  Collections.sort(list);

                  // looping through each word in list

                  for (String temp : list) {

                        // printing word

                        System.out.println(temp);

                        // writing word to output file

                        writer.println(temp);

                  }

                  input.close();

                  // closing output file, saving changes

                  writer.close();

            } catch (FileNotFoundException e) {

                  System.out.println("Error");

            }

      }

}