Question

i have the following code to retrive the data from my file. When i execute the code i come to know it’s giving only 50% of the lines from the total lines. Why it’s happening ?

    public static void main(String args[]) throws IOException
    {
        int count = 1;
    try {
            FileInputStream fileInput = new FileInputStream("C:/FaceProv.log");
            DataInputStream dataInput = new DataInputStream(fileInput);
            InputStreamReader inputStr = new InputStreamReader(dataInput);
            BufferedReader bufRead = new BufferedReader(inputStr);

                while(bufRead.readLine() != null)
                {
                    System.out.println("Count "+count+" : "+bufRead.readLine());
                    count++;

                }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

Answer 1

You’re reading the lines twice:

while(bufRead.readLine() != null) /// HERE
{
     System.out.println("Count "+count+" : "+bufRead.readLine()); // AND HERE
     count++;

}

but you only count them once. So you’re actually reading the whole file, but counting only half of the lines.

Change it to:

String line;
while((line = bufRead.readLine()) != null) {
     System.out.println("Count "+count+" : " + line);
     count++;
}

and see what happens.