import java.io.File;
import java.io.IOException;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;


/**
 *
 * @author Bill Kraynek
 */
public class SetExample {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
       Scanner fileScanner = new Scanner(new File("src/SetExample.java"));
       fileScanner.useDelimiter("[^a-zA-Z]+");
       Set<String> words = new HashSet<String>();
       Set<String> sortedWords = new TreeSet<String>();
       while( fileScanner.hasNext() ) {
           String word = fileScanner.next();
           words.add(word);
           sortedWords.add(word);
       }// end while
       String wordsOut = toString(words);
       JTextArea outArea = new JTextArea(wordsOut,50,20);
       JOptionPane.showMessageDialog(null, new JScrollPane(outArea));
       String sortedWordsOut = toString(sortedWords);
       outArea.setText(sortedWordsOut);
       JOptionPane.showMessageDialog(null, new JScrollPane(outArea));
       Set<String> lengthSortedWords = new TreeSet<String>(new LengthComparator());
       lengthSortedWords.addAll(words);
       String lengthSortedWordsOut = toString(lengthSortedWords);
       outArea.setText(lengthSortedWordsOut);
       JOptionPane.showMessageDialog(null, new JScrollPane(outArea));
    }

    static <T> String toString(Set<T> set) {
        String out = "";
        Iterator<T> itr = set.iterator();
        while( itr.hasNext() ) {
            out += itr.next() + "\n";
        }// end while
        return out;
    }

    static class LengthComparator implements Comparator<String> {
        public int compare(String lhs, String rhs) {
            int lengthDiff = rhs.length() - lhs.length();
            if( lengthDiff == 0 ) return lhs.compareTo(rhs);
            return lengthDiff;
        }// end comparte
    }// end lengthComparator

}