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File not found in Java

by Math Jeans
Tags: file, java
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Math Jeans
#1
Mar22-08, 11:38 AM
Math Jeans's Avatar
P: 340
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:

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:

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 .
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