Why does the nested while loop fail to execute in my do while loop?

[Kakashi]

My problem is when I try to run the while loop that is nested in the do while loop it fails to even enter into it. Am I missing something here, I do not have any errors or anything.
The try catch block worked fine when I was testing it in the main method and not in the do while loop. What has changed? It is nested like this
do{
//Some user input code here
if(statement)
{
try{
code here
}catch other stuff
}

and here is the code

 try{
            //read in file
            //input streams
            FileInputStream fis = new FileInputStream("Book-text.dat");
            BufferedInputStream bis = new BufferedInputStream(fis);
            DataInputStream dis = new DataInputStream(bis);
            System.out.println("From Book-Text.dat");
 
             // dis.available() returns 0 if the file does not have more lines.
            System.out.println("Entering while");
            //not entering while statement Why!
 
            while(dis.available() != 0)
            {
            // this statement reads the line from the file and print it to
              // the console.
                System.out.println("In while");
                System.out.println(dis.readLine());
            }
 
            // dispose all the resources after using them.
            System.out.println("Exit Whie");
            fis.close();
            bis.close();
            dis.close();
            System.out.println("Close Streams");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

[Dheeraj Joshi]

There is no issue in the code.Just to make sure i ran your code, and it is working properly for me.

I created a test file as input.

HI
how
are
you
.
 

The output was as expected.

From Book-Text.dat
Entering while
In while
HI
In while
how
In while
are
In while
you
In while
.
Exit Whie
Close Streams
 

I guess there is some issue in the input file.

Regards
Dheeraj Joshi

[Kakashi]

Thanks for the help, I have to think that the file is the problem too
Well the code does write to the file fine and it does exsit, I can open it with notepad and read it. So you think that the code is not getting the right file. Mybe if I gave the whole program that might help:

import java.io.*;
import java.util.Scanner;
 
 
 
/**
 * @author Matthew Millar
 * NetBeans 6.7
 * Windows Vista 64bit
 * January 30 2011
 */
//This program is to test working with object and text data using streams and files
public class Project1 {
    public static void main(String[] args) throws IOException
    {
        FileWriter file = new FileWriter("Book-text.dat");
        BufferedWriter bwrite = new BufferedWriter(file);
        ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("Book-objects.dat"));
 
 
        //three books to test prpogram with
        Book book1 = new Book("King Gus","Gus",450,1250.25);
        Book book2 = new Book("Ninja","Kim",780,55.62);
 
 
        //the choice that will be entered by the user
        int input = 0;
        do{
             //ask for user input
            System.out.println("Please pick one of the following options.");
            System.out.println("Press 1 to Populate");
            System.out.println("Press 2 to View books");
            System.out.println("Press 3 to Search");
            System.out.println("Press 4 to Insert");
            System.out.println("Press 5 to Quit the Program");
 
 
 
 
       Scanner sc = new Scanner(System.in);
       input = sc.nextInt();
 
 
        //ask the user for their choice
        System.out.println("Please pick a command to preform.");
        if(input ==1)
        {
            //populate
            System.out.println("Populating files");
            book1.writeTextFile(book1, file, bwrite);
            book1.writeObjectFile(book1, outputStream);
            book2.writeObjectFile(book2, outputStream);
            book2.writeTextFile(book2, file, bwrite);
        }//end of populate if
 
 
        if(input == 2)
        {
            try{
            //read in file
            //input streams
            FileInputStream fis = new FileInputStream("Book-text.dat");
            BufferedInputStream bis = new BufferedInputStream(fis);
            DataInputStream dis = new DataInputStream(bis);
            System.out.println("From Book-Text.dat");
 
             // dis.available() returns 0 if the file does not have more lines.
            System.out.println("Entering while");
            //not entering while statement Why!
 
            while(dis.available() != 0)
            {
            // this statement reads the line from the file and print it to
              // the console.
                System.out.println("In while");
                System.out.println(dis.readLine());
            }
 
            // dispose all the resources after using them.
            System.out.println("Exit Whie");
            fis.close();
            bis.close();
            dis.close();
            System.out.println("Close Streams");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
 
 
            //read object file
            //this works fine
 
         try {
 
            //Construct the ObjectInputStream object
            ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream("Book-objects.dat"));
            Object obj = null;
            System.out.println("From Book-Object.dat");
 
            while ((obj = inputStream.readObject()) != null) {
 
                if (obj instanceof Book) {
 
 
                    System.out.println(((Book)obj).toString());
                }
 
            }
             inputStream.close();
 
 
        } catch (EOFException ex) { //This exception will be caught when EOF is reached
            System.out.println("End of file reached.");
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        } catch (FileNotFoundException ex) {
            ex.printStackTrace();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
 
        }//end of view if
 
        if(input == 3)
        {
            //search
        }
 
        if(input == 4)
        {
            //insert
 
            //get user input for book information
            Scanner in = new Scanner(System.in);
            System.out.println("Enter Title");
            String t = in.nextLine();
            System.out.println("Enter Author name");
            String a = in.nextLine();
            System.out.println("Enter number of pages");
            int n = in.nextInt();
            System.out.println("Enter Price");
            double p = in.nextDouble();
 
            //crat new book with information
            Book newBook = new Book(t,a,n,p);
 
            //then auto add it to the files
            newBook.writeObjectFile(newBook, outputStream);
            newBook.writeTextFile(newBook, file, bwrite);
 
 
 
 
        }
 
 
        }while(input != 5);
        System.out.println("Closeing the program Bye");
        //end of do while loop
        bwrite.close();
        file.close();
        outputStream.flush();
        outputStream.close();
 
 
 
 
 
 
 
 
 
    }
 
}
 
//books class
class Book implements Serializable
{
    //variables used
    private String title;
    private String author;
    private int numPage;
    private double price;
   //construtor
    //defult no param constructor
    Book(){}
    Book(String t, String a, int n, double p)
        {
            title = t;
            author = a;
            numPage = n;
            price = p;
        }
 
    //get methods
        public String getTitle()
        {
            return title;
        }
        public String getAuthor()
        {
            return author;
        }
        public int getPage()
        {
            return numPage;
        }
        public double getPrice()
        {
            return price;
        }
 
        //set methods
        public void setTitle(String t)
        {
            this.title = t;
        }
 
        public void setAuthor(String a)
        {
            this.author = a;
        }
 
        public void setPrice(double p)
        {
            this.price = p;
        }
 
        public void setNumPage(int n)
        {
            this.numPage = n;
        }
 
 
 
        public String toString()
        {
             return getClass().getName() + "  Title: " + title + ",  Author: " + author + ",  Number of Pages: " + numPage
            + ",  Price: " + price + "\n";
        }
 
 
        //methods for writing files
        public void writeObjectFile(Object obj, ObjectOutputStream outStream)
        {
        //write object to file
        try{
 
         outStream.writeObject(obj);
 
         System.out.println("Object wrote " + obj);
 
        //clear the output stream
 
        }catch(IOException ex) {
            ex.printStackTrace();
        }
        }
 
        public void writeTextFile(Object obj, FileWriter file, BufferedWriter out)
        {
            try{
             // Create file
            String textObj = obj.toString();
            System.out.println("Write Text File " + obj);
            out.write(textObj);
             //Close the output stream
 
             }catch (Exception e){//Catch exception if any
                 System.err.println("Error: " + e.getMessage());
            }
        }
 
       public void creatBook()
       {
            System.out.println("Enter the Book Information");
            System.out.println("Enter the Title");
            System.out.println("Enter the Author");
            System.out.println("Enter the Number of Pages");
            System.out.println("Enter the Price");
 
       }
 
 
}//end of book class