Question

I am creating a simple program that counts the number of words, lines and total characters (not including whitespace) in a paper. It is a very simple program. My file compiles but when I run it I get this error:

Exception in thread "main" java.util.NoSuchElementException
    at java.util.Scanner.throwFor(Scanner.java:838)
    at java.util.Scanner.next(Scanner.java:1347)
    at WordCount.wordCounter(WordCount.java:30)
    at WordCount.main(WordCount.java:16)

Does anyone know why this is happening?

 import java.util.*;
 import java.io.*;
 public class WordCount {
//throws the exception
public static void main(String[] args) throws FileNotFoundException {
    //calls on each counter method and prints each one
    System.out.println("Number of Words: " + wordCounter());
    System.out.println("Number of Lines: " + lineCounter());
    System.out.println("Number of Characters: " + charCounter());

}

//static method that counts words in the text file  
public static int wordCounter() throws FileNotFoundException { 
//inputs the text file
Scanner input = new Scanner(new File("words.txt")); 
    int countWords = 0;
    //while there are more lines
    while (input.hasNextLine()) {
        //goes to each next word
        String word = input.next();
        //counts each word
        countWords++;
    }
    return countWords;
}

//static method that counts lines in the text file  
public static int lineCounter() throws FileNotFoundException {
//inputs the text file
Scanner input2 = new Scanner(new File("words.txt"));
    int countLines = 0;
    //while there are more lines
    while (input2.hasNextLine()) {
        //casts each line as a string
        String line = input2.nextLine();
        //counts each line
        countLines++;
    }
    return countLines;
   }    

//static method that counts characters in the text file 
public static int charCounter() throws FileNotFoundException {
//inputs the text file
Scanner input3 = new Scanner(new File("words.txt"));
    int countChar = 0;
    int character = 0;
    //while there are more lines
    while(input3.hasNextLine()) {
       //casts each line as a string
        String line = input3.nextLine();
        //goes through each character of the line
        for(int i=0; i < line.length(); i++){
            character = line.charAt(i);
             //if character is not a space (gets rid of whitespace)
            if (character != 32){
                //counts each character
                countChar++;
            }
        }           
    }
   return countChar;
}
} 

Answer 1

I can’t really say the exact reason for the problem without looking at the file (Maybe even not then).

   while (input.hasNextLine()) {
        //goes to each next word
        String word = input.next();
        //counts each word
        countWords++;
    }

Is your problem. If you are using the input.hasNextLine() in the while conditional statement use input.nextLine(). Since you are using input.next() you should use input.hasNext() in the while loops conditional statement.