Question

I have a program that adds PanelFurniture objects to an ArrayList. When i try to save the data in a file, it is giving me the exception java.io.NotSerializableException: PanelFurniture$1. PanelFurniture is the name of the class, and it implements Serializable already, so I don’t understand what the problem might be.

This is my code for writing the ArrayList to the file

if(ae.getSource() == commandButtons[5]) {
    int x = 5 , y = 11;
    File confidential = new File("secrets.txt");
    PrintWriter output = null;
    try {               
        saveFile = new FileOutputStream("myFile.dat");
        save = new ObjectOutputStream(saveFile);                                        
        save.writeObject(orderList);
        save.close(); 

        System.out.println(orderList);              
    }
    catch (Exception e){                
        e.printStackTrace();
        }
    }
}

Answer 1

Your PanelFurniture class, which is the content of your ArrayList, needs to implement the Serializable interface, as well as any anonymous inner classes (like PanelFurniture$1), so Java doesn’t know how to read/write this data to disk.

If you don’t want to use serialization, you are probably wanting to do something like this… (psuedocode)

Create a FileOutputStream
for (each item in the ArrayList){
  get the properties of the PanelFurniture object, and write them to the FileOutputStream.
  eg. fos.writeLine(panelFurniture.getName() + "," + panelFurniture.getValue());
  }
Close the FileOutputStream.