OOP Program-25

(25) 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.

Program Code:

import java.io.*;

import java.security.InvalidParameterException;

import java.util.Arrays;

import java.util.HashSet;

import java.util.TreeSet;

import java.util.Collections;

import java.util.Iterator; 

public class OOP_25 

{

 public static void main(String[] args) throws FileNotFoundException 

 {

        if (args.length != 1)

            throw new InvalidParameterException("Usage: fullFilePathName");

        File file = new File(args[0]);

        

 if (!file.isFile())

            throw new FileNotFoundException(file + " is not a file.");

        try (BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(file)), 10000)) 

 {

  String inputS;

             StringBuilder sb = new StringBuilder(10000);

             while ((inputS = in.readLine()) != null)

                 sb.append(inputS);

             String[] words = sb.toString().split("\\s+");

     

             TreeSet<String> ndWords = new TreeSet<>(Arrays.asList(words));

  

  Iterator<String> itr = ndWords.descendingIterator(); 

  String s;

  while (itr.hasNext()) 

         { 

              s = itr.next(); 

       System.out.println(s);

         } 

 }

 catch (IOException e) 

 {

            e.printStackTrace();

            System.exit(0);

        }

    }

}

textfile25.txt:

ABC, PQR, GTU, BE, Semester-4, OOP-1, 

SubjectCode:3140705, COLLEGE,

Output: