How to count number of times a word is used in a text?

Question

I am trying to count the number of times a certain word is used in a piece of text, which is String text. Do I have to create a new method

public int countWords(....) {

}

Or is there any ready thing in Java? Thanks

already answered http://stackoverflow.com/questions/2635082/java-counting-of-occurrences-of-a-word-in-a-string — animatedgif, Sep 24 '13 at 21:50
Use `StringUtils.countMatches()` in Apache Commons Lang. See http://stackoverflow.com/questions/275944/how-do-i-count-the-number-of-occurrences-of-a-char-in-a-string — musical_coder, Sep 24 '13 at 21:52

LuisCien · Accepted Answer · 2013-09-24T22:03:45.653

2

Use StringUtils.countMatches like so:

int count = StringUtils.countMatches("abcdea","a");

Here is the reference

Hope this helps!

Edit:

Well, in that case you could use Regex to solve your problem. Use the Matcher class:

Pattern myPattern = Pattern.compile("YOUR_REGEX_HERE");
Matcher myMatcher = myPattern.matcher("YOUR_TEXT_HERE");

int count = 0;
while (myMatcher.find())
    count ++;

edited Sep 24 '13 at 22:03

answered Sep 24 '13 at 21:51

LuisCien

6,362
4
34
42

Its part of apache. We would need to add the specific jar. – Crickcoder Sep 24 '13 at 21:55
Who downvoted me? Mind explaining why? – LuisCien Sep 24 '13 at 22:14
PS: i did not downvote. i upvoted and accepted the answer – Buras Sep 24 '13 at 22:19
There you go: http://commons.apache.org/proper/commons-lang/download_lang.cgi – LuisCien Sep 24 '13 at 22:19
Thanks a lot!!! That is the best and the fastest way !!! :) – Buras Sep 24 '13 at 22:23

Michał Tabor · Answer 2 · 2013-09-24T22:17:28.510

2

Here's a solution using pure Java:

public static int countOccurences(String text, String word) {
  int occurences = 0;
  int lastIndex = text.indexOf(word);
  while (lastIndex != -1) {
    occurences++;
    lastIndex = text.indexOf(word, lastIndex + word.length());
  }
  return occurences;
}

edited Sep 24 '13 at 22:17

answered Sep 24 '13 at 21:56

Michał Tabor

2,441
5
23
30

Thank you. But why do you use `lastIndex != -1` ... – Buras Sep 24 '13 at 22:08
i tried this, and it appers that i got an infinite loop – Buras Sep 24 '13 at 22:08
Yes, that results in infinite loop. You need to substring in the loop to make it work. – Crickcoder Sep 24 '13 at 22:12
@Buras I have tested it and it worked properly. How are you using it? – Michał Tabor Sep 24 '13 at 22:19
@GV Substring in loop is a very good solution ... for writing a completely inefficient code. – Michał Tabor Sep 24 '13 at 22:21
Nevermind my comments... was reading the wrong method description – LuisCien Sep 24 '13 at 22:23

score 1 · Answer 3 · answered Sep 24 '13 at 21:53

1

This may be over complicating it, but,

We could use a StringTokenizer to tokenize the String text based on spaces as your delimiter.

You'd use the nextToken() method to grab each word and compare it with your search term.

answered Sep 24 '13 at 21:53

EyeOfTheHawks

576
1
5
16

score 1 · Answer 4 · answered Sep 24 '13 at 21:53

1

int counter = 0;
while(myString.contains("textLookingFor")){
myString.replaceFirst("textLookingFor","");
counter++;
}

answered Sep 24 '13 at 21:53

Crickcoder

2,135
4
22
36

score 1 · Answer 5 · answered Sep 25 '13 at 03:02

1

Here is my solution:

Pattern myPattern = Pattern.compile("word");
Matcher myMatcher = myPattern.matcher("word");

int count = 0;
while (myMatcher.find()){
    count ++;
}

answered Sep 25 '13 at 03:02

user2813412

31
1

How to count number of times a word is used in a text?

5 Answers5