JavaAlgorithms/Others/countwords.java

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)");
    input.close();
  }

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

}