How to save data and load data from an arrayList ??

Question

i got a run time problem .....when i try to save my data to a file and load a data from a file....i got some kind of error like that
Please enter your CD`s title : ivan
Please enter your CD`s Artist/GroupName : diw
Please enter your CD`s year of release : wid
InputMismatchException error occurred (the next token does not match the Integer regular expression, or is out of range) java.util.InputMismatchException
Invaild value....Please enter the value between 1000 & 9999
Please enter your CD`s MusicGenre(e.g.: Jazz, Blues, Funk, Classical, Rock, etc...) : w
Please enter your CD`s comment : w
Do you have another Cd ? (Y/N) : n
Saving to file
java.io.EOFException
     at java.io.ObjectInputStream$BlockDataInputStream.peekByte(Unknown Source)
     at java.io.ObjectInputStream.readObject0(Unknown Source)
     at java.io.ObjectInputStream.readObject(Unknown Source)
     at Demo.loadDate(Demo.java:49)
     at Demo.readDataFromConsole(Demo.java:103)
     at Demo.main(Demo.java:173)
Exit code: 0
import java.util.ArrayList;
import java.io.*;
public class Demo{
     readOperation theRo = new readOperation();
     errorCheckingOperation theEco = new errorCheckingOperation();
     ArrayList<MusicCd> MusicCdList;
     public Demo()
     private void heading()
          System.out.println("\tTesting read data from console, save to file, reopen that file\t");
     private void saveDate()
          MusicCdList = new ArrayList<MusicCd>( ); 
          try
               File f = new File("jessica.txt");
               FileOutputStream fos = new FileOutputStream(f);
               ObjectOutputStream oos = new ObjectOutputStream(fos);
               for( MusicCd s : MusicCdList)
               oos.writeObject(s);
               oos.close();
          catch (IOException ioe)
               ioe.printStackTrace();
     private void loadDate()
          MusicCdList = new ArrayList<MusicCd>( );  
          try
               File g = new File("jessica.txt");
               FileInputStream fis = new FileInputStream(g);
               ObjectInputStream ois = new ObjectInputStream(fis);
               ArrayList<String> stuff = (ArrayList<String>)ois.readObject();
               for( String s : stuff ) System.out.println(s);
               ois.close();
          } catch (Exception ioe)
               ioe.printStackTrace();
     private void readDataFromConsole()
     //private void insertCd()
       ArrayList<MusicCd> MusicCdList = new ArrayList<MusicCd>( ); 
        readOperation theRo = new readOperation();
        errorCheckingOperation theEco = new errorCheckingOperation();
        MusicCd theCd;
        String muiseCdsTitle;
        String muiseCdsArtistOrGroupName;
        int muiseCdsYearOfRelease;
        int validMuiseCdsYearOfRelease;
        String muiseCdsMusicGenre;
        String muiseCdsAComment;
          while(true)
                String continueInsertCd = "Y";
               do
                    muiseCdsTitle = theRo.readString("Please enter your CD`s title : ");
                    muiseCdsArtistOrGroupName = theRo.readString("Please enter your CD`s Artist/GroupName : ");
                    muiseCdsYearOfRelease = theRo.readInt("Please enter your CD`s year of release : ");
                    validMuiseCdsYearOfRelease = theEco.errorCheckingInteger(muiseCdsYearOfRelease, 1000, 9999);
                    muiseCdsMusicGenre = theRo.readString("Please enter your CD`s MusicGenre(e.g.: Jazz, Blues, Funk, Classical, Rock, etc...) : ");
                    muiseCdsAComment  = theRo.readString("Please enter your CD`s comment : ");
                    MusicCdList.add(new MusicCd(muiseCdsTitle, muiseCdsArtistOrGroupName, validMuiseCdsYearOfRelease ,
                    muiseCdsMusicGenre, muiseCdsAComment));
                    MusicCdList.trimToSize();
                    //saveToFile(MusicCdList);
                    continueInsertCd = theRo.readString("Do you have another Cd ? (Y/N) : ");
               }while(continueInsertCd.equals("Y") || continueInsertCd.equals("y") );
               if(continueInsertCd.equals("N") || continueInsertCd.equals("n"));
                                    System.out.println("Saving to file ");
                                                //MusicCdList.add(new MusicCd(muiseCdsTitle, muiseCdsYearOfRelease));     
                                                saveDate();
                                    loadDate();
                              break;
     public static void main(String[] args)
          Demo one = new Demo();
          one.readDataFromConsole();
          how should i fix it if i want to reach the save to a file and load from a file purpose??
thx all
for much more understand of this program
import java.io.Serializable;
public class MusicCd implements Serializable
     private String musicCdsTitle;
     private String artistOrGroupName;
        private int yearOfRelease;
     private String musicGenre;
     private String aComment;
     public MusicCd()
          musicCdsTitle = "";
          artistOrGroupName = "";
          yearOfRelease = 1000;
          musicGenre = "";
          aComment = "";
     public MusicCd(String newMusicCdsTitle, String newArtistOrGroupName, int newYearOfRelease,
     String newMusicGenre, String aNewComment)
          musicCdsTitle = newMusicCdsTitle;
          artistOrGroupName = newArtistOrGroupName;
          yearOfRelease = newYearOfRelease;
          musicGenre = newMusicGenre;
          aComment = aNewComment;
     public String getTitle()
          return musicCdsTitle;
     public String getArtistOrGroupName()
          return artistOrGroupName;
     public int getYearOfRelease()
          return yearOfRelease;
     public String getMusicGenre()
          return musicGenre;
     public String getAComment()
          return aComment;
     public void setTitle(String newMusicCdsTitle)
          musicCdsTitle = newMusicCdsTitle;
     public void setArtistOrGroupName(String newArtistOrGroupName)
          artistOrGroupName = newArtistOrGroupName;
     public void setYearOfRelease(int newYearOfRelease)
          yearOfRelease = newYearOfRelease;
     public void setMusicGenre(String newMusicGenre)
          musicGenre = newMusicGenre;
     public void setAComment(String aNewComment)
           aComment = aNewComment;
     public boolean equalsName(MusicCd otherCd)
          if(otherCd == null)
               return false;
          else
               return (musicCdsTitle.equals(otherCd.musicCdsTitle));
     public String toString()
          return("Title: " + musicCdsTitle + "\t"
          + "Artist/GroupName: " + artistOrGroupName + "\t"
          + "Year of release: " + yearOfRelease + "\t"
          + "Music Genre: " + musicGenre + "\t"
          + "Comment: " + aComment + "\t" );
}import java.util.*;
public class readOperation{
     public String readString(String userInstruction)
          String aString = null;
          try
     Scanner scan = new Scanner(System.in);
               System.out.print(userInstruction);
               aString = scan.nextLine();
          catch (NoSuchElementException e)
               //if no line was found
               System.out.println("\nNoSuchElementException error occurred (no line was found) " + e);
          catch (IllegalStateException e)
               // if this scanner is closed
               System.out.println("\nIllegalStateException error occurred (scanner is closed)" + e);
          return aString;
     public char readTheFirstChar(String userInstruction)
          char aChar = ' ';
          String strSelection = null;
          try
               //char charSelection;
     Scanner scan = new Scanner(System.in);
               System.out.print(userInstruction);
               strSelection = scan.next();
               aChar = strSelection.charAt(0);
          catch (NoSuchElementException e)
               //if no line was found
               System.out.println("\nNoSuchElementException error occurred (no line was found) " + e);
          catch (IllegalStateException e)
               // if this scanner is closed
               System.out.println("\nIllegalStateException error occurred (scanner is closed)" + e);
          return aChar;
     public int readInt(String userInstruction) {
          int aInt = 0;
          try {
               Scanner scan = new Scanner(System.in);
               System.out.print(userInstruction);
               aInt = scan.nextInt();
          } catch (InputMismatchException e) {
               System.out.println("\nInputMismatchException error occurred (the next token does not match the Integer regular expression, or is out of range) " + e);
          } catch (NoSuchElementException e) {
               System.out.println("\nNoSuchElementException error occurred (input is exhausted)" + e);
          } catch (IllegalStateException e) {
               System.out.println("\nIllegalStateException error occurred (scanner is closed)" + e);
          return aInt;
import java.util.Scanner;
import java.util.InputMismatchException;
import java.util.NoSuchElementException;
public class errorCheckingOperation
     public int errorCheckingInteger(int checkThing, int lowerBound, int upperBound)
           int aInt = checkThing;
           try
                while((checkThing < lowerBound ) || (checkThing > upperBound) )
                     throw new Exception("Invaild value....Please enter the value between  " +  lowerBound + " & " +  upperBound );
           catch (Exception e)
             String message = e.getMessage();
             System.out.println(message);
           return aInt;
       public int errorCheckingSelectionValue(String userInstruction)
            int validSelectionValue = 0;
            try
                 int selectionValue;
                 Scanner scan = new Scanner(System.in);
                 System.out.print(userInstruction);
                 selectionValue = scan.nextInt();
                 validSelectionValue = errorCheckingInteger(selectionValue , 1, 5);
           catch (NoSuchElementException e)
               //if no line was found
               System.out.println("\nNoSuchElementException error occurred (no line was found) " + e);
          catch (IllegalStateException e)
               // if this scanner is closed
               System.out.println("\nIllegalStateException error occurred (scanner is closed)" + e);
          return validSelectionValue;
}Message was edited by:
Ivan1238
Message was edited by:
Ivan1238

Answer 1

You should thoroughly check you code. It's full of problems.
For example in saveDate():
You create a new empty ArrayList and then want so save it's contents. I guess, the file size is always 0.
For example in loadDate():
Since you read from an empty file you get an EOFException. This is ok and you should catch and treat the exception properly.
You try to read the ArrayList instead of single MusicCd objects, although in saveDate you saved the single MusicCD objects. You can only read from the file what to saved in it before.
I suggest to write the size of the ArrayList as first object in the file. Then you know how much you can expect to read when loading from the file.
private void saveDate()
          try
               File f = new File("jessica.txt");
               FileOutputStream fos = new FileOutputStream(f);
               ObjectOutputStream oos = new ObjectOutputStream(fos);
                        oos.writeObject(new Integer(MusicCdList.size()));
               for( MusicCd s : MusicCdList)
               oos.writeObject(s);
               oos.close();
          catch (IOException ioe)
               ioe.printStackTrace();
     }