Counting words in a file.

Question:

How to count the number times a certain word appears in a file?

Answer:

Use the method Scanner.next() to read in each word of the file and then compare it with the desired word.

Code:

import java.io.*;
import java.util.*;
 
public class CountWords {
   public static void main(String[] args) {
 
      int count=0;
      String word = "cat";
 
      try {
         File file = new File("file.txt");
         Scanner sc = new Scanner(new FileInputStream(file));
 
         while(sc.hasNext()){
            if(word.equalsIgnoreCase(sc.next())){
               count = count + 1;
            }
         }
      } catch (Exception e) {
      }
      System.out.println("Number of " + word  + " words: " + count);
   }
}

Output:

$ cat file.txt 
Dog cat dog cat
Cat dog cat dog

$ java CountWords
Number of cat words: 4