A class to count number of words in an input string

WordCounter.java

/* File:    WordCounter.java
 * Created: 5/14/2018
 * Author:  Sabbir Manandhar
 *
 * Copyright (c) 2018 Hogwart Inc.
 */

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Utility Class to capture the words in the given input string delimited
 * by pre-defined delimiters
 *
 * @author Sabbir Manandhar
 * @version 1.0
 */
public class WordCounter {

    private static Set<Character> delimiters = new HashSet<>();

    static {
        delimiters.add(' ');
        delimiters.add('\'');
        delimiters.add('!');
        delimiters.add('-');
        delimiters.add('(');
        delimiters.add(')');
        delimiters.add('{');
        delimiters.add('}');
        delimiters.add('[');
        delimiters.add(']');
        delimiters.add('?');
        delimiters.add('/');
        delimiters.add('\\');
        delimiters.add(',');
    }

    //---------------------------------------------------------------------------------------------

    /**
     * driver method
     * @param args
     */
    public static void main(String[] args) {
        System.out.println(count("I am lord,voldemort")); // 4
        System.out.println(getWords("I am lord,voldemort")); // 4

        System.out.println(count("I am lord     voldemort     ")); // 4
        System.out.println(getWords("I am lord     voldemort     ")); // 4

        System.out.println(count("   I am lord voldemort")); // 4
        System.out.println(getWords("   I am lord voldemort")); // 4

        System.out.println(count("   I am lord voldemort    ")); // 4
        System.out.println(getWords("   I am lord voldemort    ")); // 4

        System.out.println(count("  Lord Voldemort! is my past, my present and my future!!!!    ")); // 10
        System.out.println(getWords("  Lord Voldemort! is my past, my present and my future!!!!    ")); // 4
    } // main

    //---------------------------------------------------------------------------------------------

    /**
     * Counts the number of words in the given input string
     * @param input input string
     * @return number of words in the input
     */
    public static int count(String input) {
        boolean delimiter = true;

        int count = 0;
        for (int i = 0; i < input.length(); i++) {
            if (delimiters.contains(input.charAt(i))) { // delimiter encountered
                delimiter = true;
            } else {
                if (delimiter) { // first non delimiter encountered after sequence of delimiters, increase word count
                    count++;
                }
                delimiter = false;
            }
        }
        return count;
    } // count

    //---------------------------------------------------------------------------------------------

    /**
     * Gets the list words in the input string
     * @param input input string
     * @return List of words in the input
     */
    public static List<String> getWords(String input) {
        List<String> result = new ArrayList<>();
        boolean delimiter = true;

        //int count = 0;
        int wordStart = 0;
        for (int i = 0; i < input.length(); i++) {
            if (delimiters.contains(input.charAt(i))) { // delimiter encountered
                if (!delimiter) { // first delimiter after sequence of non delimiters, capture word
                    result.add(input.substring(wordStart, i));
                }
                delimiter = true;
            } else {
                if (delimiter) {
                    wordStart = i;
                    //count++;
                }
                delimiter = false;
            }
        }
        if (!delimiter) {
            result.add(input.substring(wordStart));
        }
        return result;
    } // getWords

    //---------------------------------------------------------------------------------------------

} // WordCounter