java – Create a Dictionary from a text file.

It takes a text file as input and outputs all the words in that file in alphabetical order, one word per line, ignoring duplicates.

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import java.io.*;

import java.util.*;
public class Dictionary {

public static void main(String[] args) {

try{

FileReader fr = new FileReader(“words.txt”);

BufferedReader br = new BufferedReader(fr);

String s;

String word = null;

String[] arrayWords;

ArrayList aListWords = new ArrayList();

int j = 0;while((s = br.readLine()) != null) {

Scanner scan = new Scanner(s);

while (scan.hasNext()) {

word = scan.next().toLowerCase();

aListWords.add(word);

j++;

}

}

br.close();

fr.close();

removeDuplicates(aListWords);

Collections.sort(aListWords);

int size = aListWords.size();

for(int i = 0; i < size ; i++){

System.out.println( aListWords.get( i ) );

}

System.out.println(j);

} catch (Exception e){//Catch exception if any

System.err.println(“Error: ” + e.getMessage());

}

}

public static void removeDuplicates(ArrayList aList) {

HashSet h = new HashSet(aList);

aList.clear();

aList.addAll(h);

}

}
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