Java File not found in Java

  • Thread starter Math Jeans
  • Start date
Hello. I am having some trouble getting a java program to work. I am supposed to make a program that takes a word and a file name, and finds all lines in that file that contain that word.

The word that I chose was "try", and the file was "Sgrep.java"

Here is the main method:

Code:
class main {
public static void main(String[] args){
        if(args.length != 2){
            System.out.println("Usage: java Sgrep <string> <filename>");
            return; }
        Sgrep task = new Sgrep(args[0], args[1]);
        System.out.println(task.getFilename());
        System.out.println(task.search());
    }
    }
and here is the class Sgrep:

Code:
import java.io.*;
public class Sgrep {
    String find;
    String file;
    Sgrep(String fin, String fil)
    {
        find=fin;
        file=fil;
    }
    public String getFilename() {
        return file;
    }
    public String search() {
        FileReader read;
        String currentLine;
        String answer = "";
        if(find == null) {return "";}
        try {
            read = new FileReader(file);
        }
        catch (FileNotFoundException e) {return "File not found";}
        LineNumberReader reader = new LineNumberReader(read);
        while(0==0) {
            try {
                currentLine = reader.readLine();
            } catch (IOException ex) {
                return answer;
            }
            if(currentLine.indexOf(find) != -1) {answer = answer + "\n" + 
                    reader.getLineNumber() + ":\t" + currentLine;}            
        }
    }
}
I put a return statement after the FileNotFoundException that prints "File not found", and that is what I have been getting.

Did I do anything wrong that is not allowing the program to find the file? Because it is supposed to work.

I would appreciate any help,
Jeans

This is important, I need this done by this weekend.


EDIT: I got it to work. The assignment sheet had given an example output that showed the file name as Sgrep.java, however, in order to get the program to recognize the file, I had to type in the entire target (C:\Users\User\Sgrep\src\sgrep\Sgrep.java). That is two hours of my life I'll never see again :biggrin:.
 
Last edited:

DrClaude

Mentor
6,807
2,923
EDIT: I got it to work. The assignment sheet had given an example output that showed the file name as Sgrep.java, however, in order to get the program to recognize the file, I had to type in the entire target (C:\Users\User\Sgrep\src\sgrep\Sgrep.java). That is two hours of my life I'll never see again :biggrin:.
I'm sure there is some teachable moment in there. For one, you will never make such a mistake again!

As for others reading this, I think that the lesson is to always check the obvious things first. If you get an error saying "file not found," believe that the program is not finding the file, and try to figure out why.
 

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