java - Java <identifier>与writeObject()一起使用

对于类分配，我需要将一个对象写入文件。我们的教授给了我们一段代码来完成此操作，但是显然这是错误的，因为我遇到了错误。这是我的代码。

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();
    }
}

我的错误发生在oos.writeObject(cInventory);行上

Item.java:150:预期
oos.writeObject(cInventory);//将初始库存写入文件
^
Item.java:150:预期
oos.writeObject(cInventory);//将初始库存写入文件
^
2个错误

是的，由于某种原因，这是两个完全相同的独立错误。

任何帮助调试将不胜感激。怎么了？

最佳答案

必须在主方法中

//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

更改代码:

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();
    }

}

提示:将常量更改为final static long ..如果您使用static，则值将在编译时复制

提示2:照顾异常..