Question

For a class assignment, I’m required to write an object to a file. Our professor gave us a section of code to complete this, but apparently it’s wrong because I’m getting an error. Here’s my code.

class InvMaintenance {

    //create an OutputStream to write data to a file
    FileOutputStream fos = new FileOutputStream(inven.dat);
    BufferedOutputStream bos = new BufferedOutputStream(fos);
    ObjectOutputStream oos = new ObjectOutputStream(bos);

    final long MAX_SIZE = 100; //constant for array length
    Inventory cInventory = new Inventory(MAX_SIZE); //instantiate Inventory object
    oos.writeObject(cInventory); //write initial Inventory to file  
    public static void main(String[] args) {
        //Output options
        /*  Inventory Maintenance
            1) Add Item
            2) Remove Item
            3) Sell Item
            4) Receive Item
            5) Display Inventory
            6) Quit
            Please Select NUMBER: */

        //switch on options
        //call appropriate method

        oos.writeObject(cInventory);
        oos.close();
    }
}

My error is occuring on the line oos.writeObject(cInventory);

Item.java:150: <identifier> expected
    oos.writeObject(cInventory);            //write initial Inventory to file   
                   ^
Item.java:150: <identifier> expected
    oos.writeObject(cInventory);            //write initial Inventory to file   
                              ^
2 errors

And yes, for some reason it’s saying this is two separate errors that are… exactly the same.

Any help debugging would be appreciated. What’s wrong?

Answer 1

that had to be in the main-method

//create an OutputStream to write data to a file
FileOutputStream fos = new FileOutputStream(inven.dat);
BufferedOutputStream bos = new BufferedOutputStream(fos);
ObjectOutputStream oos = new ObjectOutputStream(bos);

Inventory cInventory = new Inventory(MAX_SIZE); //instantiate Inventory object

changed Code:

class InvMaintenance {

    final static long MAX_SIZE = 100;          //constant for array length

    public static void main(String[] args)
    {
        //Output options
            /*  Inventory Maintenance
                1) Add Item
                2) Remove Item
                3) Sell Item
                4) Receive Item
                5) Display Inventory
                6) Quit
                Please Select NUMBER: */

        //switch on options
        //call appropriate method

        //create an OutputStream to write data to a file
        FileOutputStream fos = new FileOutputStream(inven.dat);
        BufferedOutputStream bos = new BufferedOutputStream(fos);
        ObjectOutputStream oos = new ObjectOutputStream(bos);

        Inventory cInventory = new Inventory(MAX_SIZE); //instantiate Inventory object

        oos.writeObject(cInventory);
        oos.close();
    }   

}

Hint: change the constant to final static long .. it you use static the values is copied on compile time

Hint2: take care of the exceptions ..