Problem storing java object in file

Question

When I try to store an object in a binary file, the file with the extension .bin is created. However, when I try to access it by another class, it doesn’t even try to open the file .bin that I recorded my object. How to solve the problem?

Main Class

package ordenacao;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.util.Scanner;

public class Principal {

    public static void main(String[] args){
        lista l = new lista();
        lista aux = new lista();
        Scanner input = new Scanner(System.in);
        int x,i;

        for(i=0;i<4;i++){
            System.out.println("Digite um valor para empilhar:");
            x = input.nextInt();
            l.InsereInicio(x);
        }
        System.out.println("Dados Inseridos:");
        for(i=0;i<4;i++){
            x = l.removeInicio();
            aux.InsereFinal(x);
            System.out.println(x);
        }
        l = aux;
        try{
            OutputStream fileStream = new FileOutputStream("lista.bin");
            ObjectOutputStream os = new ObjectOutputStream(fileStream);
            os.writeObject(l);
            os.close();
            fileStream.close();
        }catch(IOException e){
            System.out.println("Erro 1");
        }
    }
}

Object I’m Wanting to store

package ordenacao;

import java.io.Serializable;

public class lista implements Serializable{
    elemento primeiro;
    elemento ultimo;

    public void InsereInicio(int valor){
        elemento novoprimeiro = new elemento();
        novoprimeiro.dado = valor;
        novoprimeiro.proximo = primeiro;
        primeiro = novoprimeiro;
        if(ultimo==null){
            ultimo = novoprimeiro;
        }
    }

    public void InsereFinal(int valor){
        elemento novoultimo = new elemento();
        novoultimo.dado = valor;
        novoultimo.proximo = null;
        if(primeiro == null){
            primeiro = novoultimo;
        }else{
            ultimo.proximo = novoultimo;
        }
        ultimo = novoultimo;
    }

    int estaVazio(){
        if(primeiro==null){
            return 1;
        }
        return 0;
    }

    int removeInicio(){
        if(estaVazio()==1){
            System.out.println("Esta vazio");
            return -1;
        }
        int k = primeiro.dado;
        primeiro = primeiro.proximo;
        if(primeiro==null){
            ultimo = null;
        }
        return k;
    }

    int removeFinal(){
        if(estaVazio()==1){
            return -1;
        }
        int k = ultimo.dado;
        elemento fim = primeiro;
        elemento penultimo = null;
        while(fim.proximo!=null){
            penultimo = fim;
            fim = fim.proximo;
        }
        if(penultimo!=null){
            penultimo.proximo = null;
            ultimo = penultimo;
        }else{
            primeiro = null;
            ultimo = null;
        }
        return k;
    }

    int remover(int pos){
        if((pos<0)||(estaVazio()==1)){
            return -1;
        }
        elemento anterior = new elemento();
        elemento atual = primeiro;
        int i;
        for(i=0;i<pos-1;i++){
            anterior = atual;
            atual = atual.proximo;
        }
        anterior.proximo = atual.proximo;
        atual = null;
        return 1;
    }
}

Reader who should read the data

package pacotejava;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;

public class PrincipalPacotenovo {
    public static void main(String[] args){
            int i;
            lista noval;
        try{
            InputStream conectar = new FileInputStream("lista.bin");
            ObjectInputStream os = new ObjectInputStream(conectar);
            Object obj = os.readObject();
            noval = (lista)obj;
            for(i=0;i<4;i++){
                System.out.println(noval.removeInicio());
            }
        }catch(IOException e){
            System.out.println("Erro 1");
        }catch(ClassNotFoundException e){
            System.out.println("Erro 2");
        }       
    }
}

-------Update-------

I managed to solve one of the problems when I played throws Ioexception the compiler ended up showing me the lines that were causing error(I had not closed the reader and I had forgotten to implement in one of the classes of my package the Serializable,and so I was able to compile the writer without problems),in relation to the reader I did not get the same luck,the error that appeared was the following:

Exception in thread "main" java.lang.ClassCastException: ordenacao.lista cannot be cast to pacotejava.lista
    at pacotejava.PrincipalPacotenovo.main(PrincipalPacotenovo.java:14)
C:\Users\Renan\AppData\Local\NetBeans\Cache\8.1\executor-snippets\run.xml:53: Java returned: 1
FALHA NA CONSTRUÇÃO (tempo total: 0 segundos)

Answer 1

thank you for trying to help me,I realized the error after a little while thinking,the idea of recording in the file was that it could convert the object data into a serialized bit string and then while reading it return all the data stored in that object that was written in the file,the problem is that my object consists of "pointers",and when I recorded the list object,it recorded not only the data but also the "pointers" of the other objects that were on the list,and the problem was there,the Java "pointer" is referenced by the package in which the object(java file) found itself,and I was trying to refer for a different package,and while trying to do this it was giving error because it could not catch the reference,.