Java/Others/CountWords.java at master · primary-code-test/Java · GitHub

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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;

}