Beginner question - Can't read nor write a file using NetBean...

Question

Hi ,
I'm a beginner java programmer, I got trouble when it comes to read or write a file program..
I tried 3 programs and all of them can't read the file I want to read, eventhought I have put the txt file in the same folder with my source code.
here is the source code I got from some site
import java.io.*;
class FileReadTest {
public static void main (String[] args) {
     FileReadTest f = new FileReadTest();
f.readMyFile();
void readMyFile() {
DataInputStream dis = null;
String record = null;
int recCount = 0;
try {
File f = new File("mydata.txt");
FileInputStream fis = new FileInputStream(f);
BufferedInputStream bis = new BufferedInputStream(fis);
dis = new DataInputStream(bis);
while ( (record=dis.readLine()) != null ) {
recCount++;
System.out.println(recCount + ": " + record);
} catch (IOException e) {
// catch io errors from FileInputStream or readLine()
System.out.println("Uh oh, got an IOException error! " + e.getMessage());
} finally {
// if the file opened okay, make sure we close it
if (dis != null) {
     try {
dis.close();
     } catch (IOException ioe) {
I also have tried another from book , both of them give the same result, can't read the file...
Please help me with this...
Thank you very much

Answer 1

To start with use the full path to the file
i.e. File f = new File("c:\\the\\full\\path\\to\\your\\file\\mydata.txt"); // Assumes a Windows platform using the C drive
Then check to make sure you fiel exists e.g. System.out.println("File exists = " + f.exists());
You can even test to see if the file is readable but since you created the file this porbably is not required.