GTU 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.

import java.io.*;
import java.util.*;
 
class Program_25 {
    public static void main(String[] args) throws Exception {
        File fin = new File(args[0]);
        BufferedReader br = new BufferedReader(new FileReader(fin));
        StringBuffer buffer = new StringBuffer();
        String str;
 
        while ((str = br.readLine()) != null) { // reading the text file
            buffer.append(str); // storing text in StringBuffer
            buffer.append(" "); // Separating words by spaces
        }
        ArrayList list = new ArrayList(); // Declaring ArrayList
        StringTokenizer st = new StringTokenizer(buffer.toString().toLowerCase());
        while (st.hasMoreTokens()) { // creating a list of words
            String s = st.nextToken();
            list.add(s);
        }
        HashSet set = new HashSet(list); // it is created to avoid duplicate
        List arrayList = new ArrayList(set); // creating list of words
        Comparator c = Collections.reverseOrder();
        Collections.sort(arrayList, c);
        for (Object obj : arrayList) {
            System.out.println(obj.toString()); // displaying content
        }
    }
}

Input.txt file

Output

Previous Program

gtu oop lab manual,

oop GTU Practical,

oop Programs,

Object oriented Programming,

Gtu study material 3140705,

OOP 3140705,

oop practical list,

Java Programming,

gtu oop practical,

oop lab solution gtu