My java program seems to be skipping over the try{}, executing the catch{} and then throwing a NullPointerException. What should I do?
- by Matt Bolopue
I am writing a program that calculates the number of words, syllables, and sentences in any given text file. I don't need help finding those numbers, however my program (which currently should only find the number of words in the text file) will not import the text file even when I type in the name of the file correctly. The text file is in the same folder as the source code. Instead it tells me every time that what I typed in has the wrong file extension (see my catch{}) and then proceeds to throw a null pointer. I am at a loss for what could be causing it. Any suggestions?
import java.io.*;
import java.util.*;
public class Reading_Lvl_Calc {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int words = 0;
String fileName;
Scanner scan;
Scanner keyread = new Scanner(System.in);
System.out.println("Please enter a file name (or QUIT to exit)");
fileName = keyread.nextLine();
File doc = new File(fileName);
//while(scan.equals(null)){
try
{
scan = new Scanner(doc);
}
catch(Exception e)
{
if(fileName.substring(fileName.indexOf(".")) != ".txt")
System.out.println("I'm sorry, the file \"" + fileName + "\" has an invalid file extension.");
else
System.out.println("I am sorry, the file \"" + fileName + " \" cannot be found.\n The file must be in the same directory as this program");
scan = null;
}
// }
while(scan.hasNext()){
words++;
scan.next();
}
System.out.println(words);
}
}
