Reputation: 2145

FileNotfound exception in simple java code

I'm using this code to read a file in java using the filereader object. However the application throws an exception stating that it is not able to find the file.Can anyone help this novice guy just into java programming

import java.util.*;
import java.io.*;
import java.util.Scanner;
import java.io.FileReader;
import java.io.PrintWriter;


public class CFileReader {

    /**
     * @param args
     */
    public static void main(String[] args)  throws FileNotFoundException
    {
        String objLine;
        String strInputFileName;
        FileReader objReader = null;
        Scanner objScanner;
        File objFile;

        if(args.length > 0)
        {
            for(int i = 0;i < args.length ;i++)
            {
                //Gets the arguments into the strInputFileName variable
                strInputFileName = args[i];

                System.out.println("Filename entered was : " + strInputFileName);

                //Create a file object which points to the filename i.e strInputFileName 
                objFile = new File(strInputFileName);

                //Create a FileReader object with the File object i.e objFile as the input parameter
                objReader = new FileReader(objFile);

                System.out.println("Filereader object is : " + objReader.toString());

                //Create a scanner object with FileReader as input parameter
                objScanner = new Scanner(objReader);

                System.out.println(args);


                //Scans the file if it has next line
                while(objScanner.hasNextLine())
                {
                    //Store the contents i.e. first line in the objLine Variable
                    objLine = objScanner.nextLine();


                    //prints the contents
                    if(objLine.indexOf(i) > 0)
                        {
                            System.out.println(objLine);
                        }
                }


            }

        }
        else
        {
            //Warn the user to enter the command line arguments if he has not entered
            System.out.println("Please Enter Command line args");
        }

    }

}

To compile the program i use

javac CFileReader.java

and to run

java CFileReader "C:\\Hello.txt"

where Hello.txt is a simple text file with some contents

Thanks a lot in advance

Upvotes: 0

Answers (6)

vextorspace

Reputation: 934

I generally put in the following lines between my File object and its use:

if (!objFile.isFile() || !objFile.exists()) {
  System.out.println("Could not find file: " + objFile.getPath().toString();
}

this will often show a problem in the string format of the file name.

Upvotes: 0

Kelly S. French

Reputation: 12344

Check that your input file actually exists. When I ran your code on my machine, I didn't have permission to create a file in the root of C:. How did you create your test file?

When I moved the file to another drive, e.g. "t:\hello.txt" it worked the first time.

Upvotes: 0

user130076

Reputation:

I compiled and tested this code myself on Windows, and it works fine. Either the file you are after does not exist, or you are making a mistake when you type in the name of the file on the command line.

Upvotes: 0