CSC435 - INPUT / OUTPUT TEXT FILE

CHAPTER 8 - INPUT / OUTPUT TEXT FILE 

EXAMPLE -

The important thing to remember :

//the classes use included

import java.util.*;

import java.io.*;

import java.util.StringTokenizer;

//the declaration

public static void main (String[] args) throws IOException

//define what file in and what file out

File fileIn = new File ("dorm.dat");

File fileOut1 = new File ("single.out");

// define the file in variable and the file out variable

Scanner in = new Scanner (fileIn);

PrintWriter out_single = new PrintWriter (fileOut1);

//this is how to write to file

out_single.println("Id number\tName\t\tStatus");

// ways to loop the file in

String indata = null;

while (in.hasNext()) {

indata = in.nextLine();

StringTokenizer st = new StringTokenizer(indata, ";");

// don’t forget to close the file

in.close();

out.close();

// error catcher

catch (IOException ioe)

{

System.out.println (ioe.getMessage());

}

catch (Exception ex)

{

System.out.println (ex.getMessage());

}

import java.util.*;

import java.io.*;

import java.util.StringTokenizer;

public class STUDENT

{

    public static void main (String[] args) throws IOException

    {       

       try

       {               

            File fileIn = new File ("dorm.dat");

       

            if (!fileIn.exists())

            {

                System.out.println (“File not exist”);

                System.exit(0);

            }

           

            String studentid,name, status, type;

           

            int total_Single = 0,total_SFreshman = 0,

total_SSenior = 0,total_SJunior = 0,total_SSophomore = 0;

            int total_Double = 0,total_DFreshman = 0,

total_DSenior = 0,total_DJunior = 0,total_DSophomore = 0;

            

           

            File fileOut1 = new File ("single.out");

            File fileOut2 = new File ("double.out");

       

            Scanner in = new Scanner (fileIn);

            PrintWriter out_single = new PrintWriter (fileOut1);

            PrintWriter out_double = new PrintWriter (fileOut2);

           

            out_single.println("Id number\tName\t\tStatus");

            out_double.println("Id number\tName\t\tStatus");

                

            String indata = null;

            while (in.hasNext())

            {

                indata = in.nextLine();

                StringTokenizer st = new StringTokenizer(indata, ";");

               

                studentid = st.nextToken();

                name = st.nextToken();

                status = st.nextToken();

                type = st.nextToken();

               

                if ( type.equalsIgnoreCase("SINGLE") )

                {

                   total_Single++;

                   if ( status.equalsIgnoreCase("SENIOR"))

                        total_SSenior++;

                   else if ( status.equalsIgnoreCase("JUNIOR"))                  

                        total_SJunior++;

                   else if ( status.equalsIgnoreCase("FRESHMAN"))                  

                        total_SFreshman++;

                   else                   

                        total_SSophomore++;

                }

                else

                {

                   total_Double++;

                   if ( status.equalsIgnoreCase("SENIOR"))

                        total_DSenior++;

                   else if ( status.equalsIgnoreCase("JUNIOR"))                  

                        total_DJunior++;

                   else if ( status.equalsIgnoreCase("FRESHMAN"))                  

                        total_DFreshman++;

                   else                   

                        total_DSophomore++;

                }

                   

         }

                     

        

         in.close();

         out.close();

         outPASS.close();

         outFAIL.close();

         System.out.println("Habis Write Files!!!\n\n");

      }

     

      catch (FileNotFoundException fnf)

      {

          System.out.println (fnf.getMessage());

        }

       

      catch (IOException ioe)

      {

          System.out.println (ioe.getMessage());

        }

       

      catch (Exception ex)

      {

          System.out.println (ex.getMessage());

        }

   }

}