how to count the exact number of words in a string that has empty spaces between words?

Question

Write a method called wordCount that accepts a String as its parameter and returns the number of words in the String. A word is a sequence of one or more nonspace characters

Answer 1

http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#split(java.lang.String)

Splits this string around matches of the given regular expression.

Answer 2

public static int wordCount(String s){
    int counter=0;
    for(int i=0;i<=s.length()-1;i++){
        if(Character.isLetter(s.charAt(i))){
            counter++;
            for(;i<=s.length()-1;i++){
                if(s.charAt(i)==' '){
                    i++;
                    break;
                }
            }
        }
    }
    return counter;
}

This is what you need if don't use the predefined function. I have tested it by myself. Please let me know if there is any bugs!

Answer 3

My few solutions:

public static int wordcount1(String word) {

        if (word == null || word.trim().length() == 0) {
            return 0;
        }

        int counter = 1;

        for (char c : word.trim().toCharArray()) {
            if (c == ' ') {
                counter++;
            }
        }
        return counter;
    }

//

public static int wordcount2(String word) {
        if (word != null || word.length() > 0) {
            return word.trim().length()
                    - word.trim().replaceAll("[ ]", "").length() + 1;
        } else {
            return 0;
        }
    }

// Recursive

public static int wordcount3(String word) {
        if (word == null || word.length() == 0) {
            return 0;
        }
        if (word.charAt(0) == ' ') {
            return 1 + wordcount3(word.substring(1));
        }
        return wordcount3(word.substring(1));
    }

//

public static int wordcount4(String word) {
        if (word == null || word.length() == 0) {
            return 0;
        }

        String check = word.trim();
        int counter = 1;
        for (int i = 0; i < check.length(); i++) {
            if (i > 0 && Character.isSpaceChar(check.charAt(i))
                    && !Character.isSpaceChar(check.charAt(i - 1))) {
                counter++;
            }
        }
        return counter;
    }