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

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