查找句子中单词数的简单Java程序

Question

  public static String number(String words) {
      int length = words.length;
      int total = 0;
      while(int index < length) {
          total = total + 1;
          index = index + 1;
          }
      }
      String output;
      output = total + " word";
      return output;
  }

Example output for this would be:

numberOfWords("Hello whats up?")
3 word

This would work for all proper sentences but I have to account for bad input for example:

"Hi             my         name      is bob"

, this would be like thirty plus words. Also

"                 "

, should be 0 words. Is there any simple way to make the first example to "hi my name is bob" ?

Answer 1

you can do something like this :

String trimmed = text.trim();
int words = trimmed.isEmpty() ? 0 : trimmed.split("\\s+").length;

or (simplest way):

use str.replaceAll("\\s+"," "); 

Answer 2

Simplest will work in every case

        String word = "Hi             my         name      is bob";
        word = word.replaceAll("\\s+", " ");
        String count [] = word.split(" ");

        System.out.println(count.length);