package Others;

import java.util.Scanner;

/**
 * You enter a string into this program, and it will return how many words were
 * in that particular string
 *
 * @author Marcus
 */
public class CountWords {

 public static void main(String[] args) {
 Scanner input = new Scanner(System.in);
 System.out.println("Enter your text: ");
 String str = input.nextLine();

 System.out.println("Your text has " + wordCount(str) + " word(s)");
 System.out.println("Your text has " + secondaryWordCount(str) + " word(s)");
 input.close();
 }

 private static int wordCount(String s) {
 if (s == null || s.isEmpty())
 return 0;
 return s.trim().split("[\\s]+").length;
 }

 /**
 * counts the number of words in a sentence but ignores all potential
 * non-alphanumeric characters that do not represent a word. runs in O(n) where
 * n is the length of s
 * 
 * @param s String: sentence with word(s)
 * @return int: number of words
 */
 private static int secondaryWordCount(String s) {
 if (s == null || s.isEmpty())
 return 0;
 StringBuilder sb = new StringBuilder();
 for (char c : s.toCharArray()) {
 if (Character.isLetter(c) || Character.isDigit(c))
 sb.append(c);
 }
 s = sb.toString();
 return s.trim().split("[\\s]+").length;
 }
}