10. Extract All Unique Words

/* At the first line at the console you are given a piece of text.
 * Extract all words from it and print them in alphabetical order.
 * Consider each non-letter character as word separator.
 * Take the repeating words only once. Ignore the character casing.
 * Print the result words in a single line, separated by spaces. */

import java.util.Scanner;
import java.util.TreeSet;

public class _10_ExtractAllUniqueWords {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter your text on single line:");
        String inputLine = scan.nextLine().toLowerCase();

        String[] textStr = inputLine.split("[^a-z]+");
        TreeSet<String> extractWords = new TreeSet<>();
        for (String word : textStr) {
            extractWords.add(word);
        }

        System.out.println("The all Extract words in alphabetical order are:");
        for (String string : extractWords) {
            System.out.print(string + " ");
        }
    }

}