Unable to open a file using FileReader in java applet while the programs runs without any error in Eclipse IDE

Question

I'm writing an applet. When i am running the code in command prompt it shows a file not found exception. The program is running pretty fine in Eclipse IDE. Can anyone tell what could be the error?

Frame frame= new Frame();
FileDialog openfile= new FileDialog(frame,"Select a file", FileDialog.LOAD);
openfile.setVisible(true);
String file=openfile.getFile();
System.out.println(file);
try{
FileReader f= new FileReader(file);
BufferedReader br= new BufferedReader(f);
Scanner in=new Scanner(br);
while(in.hasNextInt()){
n=in.nextInt();
count++;
sum += n;
System.out.println(n);

}
System.out.println("Count:" + count);

Answer 1

This happens if the target file is not in the same directory as your application.

Use String file = openfile.getDirectory() + File.separator + openfile.getFile(); to get the absolute path to the target file.

Answer 2

You need to specify the directory

import java.awt.FileDialog;
import java.awt.Frame;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

public class FileReader1 {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        int sum=0,count=0,n;
        Frame frame= new Frame();
        FileDialog openfile= new FileDialog(frame,"Select a file", FileDialog.LOAD);
        openfile.setVisible(true);
        String dir=openfile.getDirectory();
        String file = openfile.getFile();
        File ff = new File(dir+file);
        FileReader fr = null;
        BufferedReader br = null;
        Scanner in = null;
        System.out.println(dir+file);
        try{

            fr  = new FileReader(ff);
            br = new BufferedReader(fr);
            in=new Scanner(br);
            while(in.hasNextInt()){
                n=in.nextInt();
                count++;
                sum += n;
                System.out.println(n);
            }
            System.out.println("Count:" + count);

        }catch(Exception e){
            System.out.println("Exception"+e);
        }finally{
            fr.close();
            br.close();
            in.close();
        }

    }
}