Question

I need help with reading an array list from a Serialized text file, I do not believe I am having a problem with it however I cannot see if it is actually storing all of the information because I cant print it out to test it, here are the code snipets:
and when I do read from the file I get the ArrayList cannot be cast to StoreAddress

   FileInputStream ios = new FileInputStream("C:\\Users\\Mr Cata\\Desktop\\Testingoutput.txt");
   ObjectInputStream ois = new ObjectInputStream(ios);
   StoreAddress SAR = (StoreAddress)ois.readObject();
   ArrayList<StoreAddress> ALStore = (ArrayList)ois.readObject();

   for(int i = 0; i < ALStore.size(); i++){
        String list = ALStore.get(i).toString();            
   }

   ios.close();

next

for(int i = 0; i < ALStore.size(); i++){
   ALStore.get(i);                  
}

…

for(int i = 0; i < ALStore.size(); i++){
   if (i >= ALStore.size())
   {
        ALStore.add(SA);}
   }

   FileOutputStream fos = new FileOutputStream("C:\\Users\\Mr Cata\\Desktop\\Testingoutput.txt");
   ObjectOutputStream oos = new ObjectOutputStream(fos);

   oos.writeObject(ALStore);
   fos.close();
}

Answer 1

When you are writing into the file , you write like

for(int i = 0; i < ALStore.size(); i++){
  if (i >= ALStore.size()) {
         ALStore.add(SA);
        }
    }
FileOutputStream fos = new FileOutputStream("C:\\Users\\MrCata\\Desktop\\Testingoutput.txt");
ObjectOutputStream oos = new ObjectOutputStream(fos);

oos.writeObject(ALStore);
fos.close();

Here you are writing the

ALStore

which is the array list you are mentioning. But when you are reading, your snippet looks like

FileInputStream ios = new FileInputStream("C:\\Users\\MrCata\\Desktop\\Testingoutput.txt");
 ObjectInputStream ois = new ObjectInputStream(ios);
 StoreAddress SAR = (StoreAddress)ois.readObject();
 ArrayList<StoreAddress> ALStore = (ArrayList)ois.readObject();
 for(int i = 0; i < ALStore.size(); i++){
    String list = ALStore.get(i).toString();

  }

 ios.close();

what you have to notice here is you have have written only array list object, but not StoreAddress. If so, what is the need for the line

 StoreAddress SAR = (StoreAddress)ois.readObject();

in the snippet ? This is the problem here. Remove this and it should work fine.