// This is the original program showing correct use of try catch block 
   import java.util.Scanner;
   import java.io.*;
   public class ReadFromFile
   {
      public static void main (String [] args)
      {
         String fileName;
         Scanner fileScanner;
         Scanner keyboard;
         int value;
      
         keyboard = new Scanner (System.in);
         System.out.println (" Please enter name of file holding integers and hit return ");
         fileName = keyboard.nextLine();
      
         System.out.println (" The name of the file you want to open is " + fileName);
         
         try
	 { 
            fileScanner = new Scanner (new File (fileName));
            while (fileScanner.hasNextInt()) 
            {
               value = fileScanner.nextInt();
               System.out.println (" The value you got from the file is " + value);
            }
         }  
         catch (FileNotFoundException fnfe)
	 {
	   System.out.println (" The file you wanted to open was not found ");
	 }
         
      } // end main
   } // end class 
_____________________________________________________ 
// This version has no try catch block and requires the "throws IOException" to compile
   import java.util.Scanner;
   import java.io.*;
   public class ReadFromFile2
   {
      public static void main (String [] args) throws IOException
      {
         String fileName;
         Scanner fileScanner;
         Scanner keyboard;
         int value;
      
         keyboard = new Scanner (System.in);
         System.out.println (" Please enter name of file holding integers and hit return ");
         fileName = keyboard.nextLine();
      
         System.out.println (" The name of the file you want to open is " + fileName);
         
         
            fileScanner = new Scanner (new File (fileName));
            while (fileScanner.hasNextInt()) 
            {
               value = fileScanner.nextInt();
               System.out.println (" The value you got from the file is " + value);
            }
         
         
         
      } // end main
   } // end class
____________________________________________________
// This file uses "grandaddy Exception e" 
   import java.util.Scanner;
   import java.io.*;
   public class ReadFromFile3
   {
      public static void main (String [] args)
      {
         String fileName;
         Scanner fileScanner;
         Scanner keyboard;
         int value;
      
         keyboard = new Scanner (System.in);
         System.out.println (" Please enter name of file holding integers and hit return ");
         fileName = keyboard.nextLine();
      
         System.out.println (" The name of the file you want to open is " + fileName);
         
         try
         { 
            fileScanner = new Scanner (new File (fileName));
            while (fileScanner.hasNextInt()) 
            {
               value = fileScanner.nextInt();
               System.out.println (" The value you got from the file is " + value);
            }
         }  
         
             catch (Exception e)
            
            {
               System.out.println (" The file you wanted to open was not found ");
            }
         
      } // end main
   } // end class
___________________________________________________
// This file uses "grandaddy e" but calls getMessage to determine what the exception was
   import java.util.Scanner;
   import java.io.*;
   public class ReadFromFile4
   {
      public static void main (String [] args)
      {
         String fileName;
         Scanner fileScanner;
         Scanner keyboard;
         int value;
      
         keyboard = new Scanner (System.in);
         System.out.println (" Please enter name of file holding integers and hit return ");
         fileName = keyboard.nextLine();
      
         System.out.println (" The name of the file you want to open is " + fileName);
         
         try
         { 
            fileScanner = new Scanner (new File (fileName));
            while (fileScanner.hasNextInt()) 
            {
               value = fileScanner.nextInt();
               System.out.println (" The value you got from the file is " + value);
            }
         }  
         
             catch (Exception e)
            
            {
               System.out.println (" The file you wanted to open was not found ");
               System.out.println(e.getMessage());
            }
         
      } // end main
   } // end class
___________________________________________________
// This version has the wrong catch block and requires "throws IOException" to compile
import java.util.Scanner;
import java.io.*;
public class ReadFromFile5   
{
    public static void main (String [] args)throws IOException
    {
         String fileName;
         Scanner fileScanner;
         Scanner keyboard;
         int value;
      
         keyboard = new Scanner (System.in);
         System.out.println (" Please enter name of file holding integers and hit return ");
         fileName = keyboard.nextLine();
      
         System.out.println (" The name of the file you want to open is " + fileName);
         
         try
         { 
            fileScanner = new Scanner (new File (fileName));
            while (fileScanner.hasNextInt()) 
            {
               value = fileScanner.nextInt();
               System.out.println (" The value you got from the file is " + value);
            }
         }  
         
             catch (ArrayIndexOutOfBoundsException  aioobe)
            {
               System.out.println (" The file you wanted to open was not found ");
            }
         
   } // end main
} // end class
___________________________________________________
// This version has two catch blocks, the needed one and an extra
   import java.util.Scanner;
   import java.io.*;
   public class ReadFromFile6   
   {
      public static void main (String [] args) 
      {
         String fileName;
         Scanner fileScanner;
         Scanner keyboard;
         int value;
      
         keyboard = new Scanner (System.in);
         System.out.println (" Please enter name of file holding integers and hit return ");
         fileName = keyboard.nextLine();
      
         System.out.println (" The name of the file you want to open is " + fileName);
         
         try
	 { 
            fileScanner = new Scanner (new File (fileName));
            while (fileScanner.hasNextInt()) 
            {
               value = fileScanner.nextInt();
               System.out.println (" The value you got from the file is " + value);
            }
         }  
         
	catch (ArrayIndexOutOfBoundsException  aioobe)
	{
	   System.out.println ("Array index went out of bounds ");
	}
        catch (FileNotFoundException fnfe)
	{
	   System.out.println (" The file you wanted to open was not found ");
	}
      } // end main
   } // end class