OOP-JAVA Practical 25

• PPS(C)
• JAvA

• Aim: Write a program that reads words from a text file and displays all the nonduplicate words in descending order. The text file is passed as a command-line argument.
• Code:

  import java.io.File;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Scanner;
  
  public class practical25 {
      public static void main(String[] args) {
          if (args.length != 1) {
          System.out.println("Enter file name as command line argument");
              System.exit(0);
          }
          String filename = args[0];
          String line;
          ArrayList<String> reveList = new ArrayList<String>();
          try {
              Scanner s = new Scanner(new File(filename));
              while ((s.hasNextLine())) {
                  line=s.nextLine();
                  String[] words = line.split("[ ,.]+");
                  for (int i = 0; i < words.length; i++) {
                      /*
                       * add this line of code to convert all words in lowercase
                       * "String str=words[i].toLowerCase();" 
                       * and in this for loop change words[i] to str to get all words in lowercase.
                       */
                      if (reveList.contains(words[i])) {
                          continue;
                      } else {
                          reveList.add(words[i]);
                      }
                      /* change upto here for getting words in lowercase */
                  }
              }
              s.close();
          } catch (Exception e) {
              System.out.println(e);
          }
          Collections.sort(reveList, Collections.reverseOrder());
          System.out.println(reveList);
      }
  }

• Output:
  

Practical 24