java-从二进制文件中读取arraylist集合并在新数组中分配每个元素

在此之前，我已经将arraylist数据写入了一个名为（itStateBaryan.dat）的二进制文件中

现在我试图从二进制文件中读取arraylist，然后将arraylist中的每个元素分配给数组

到目前为止，我有：

public CarOwner[] readListFromBinary() throws Exception
{
    String fileName = "ItStateBinary.dat";
    FileInputStream inStream = new FileInputStream(fileName);
    ObjectInputStream objectInputFile = new ObjectInputStream(inStream);

    //need to create CarOwner[] object called temp and return
}

readListFromBinary（）方法从二进制文件（ltStateBinary.dat）中读取ArrayList集合。然后，将每个ArrayList对象项写入新创建的名为temp的CarOwner[]。temp返回给调用方法

编辑：

public CarOwner[]readListFromBinary（）引发异常
{
String fileName=“ItStateBinary.dat”；
FileInputStream inStream=新的FileInputStream（文件名）；
ObjectInputStream objectInputFile=新ObjectInputStream（流内）；
ArrayList read=（ArrayList）objectInputFile.readObject（）；
CarOwner[]temp=read.toArray（新的CarOwner[read.size（）]）；
返回温度；
}

---

有人知道这种方法有什么问题吗？它给了我一个编译器警告

我不知道你在问什么，但假设你像这样将ArrayList写入文件 即：

 public CarOwner[] readListFromBinary() throws Exception
{
    String fileName = "ItStateBinary.dat";
    FileInputStream inStream = new FileInputStream(fileName);
    ObjectInputStream objectInputFile = new ObjectInputStream(inStream);

    ArrayList<CarOwner> read = (ArrayList<CarOwner>)objectInputFile.readObject();

    CarOwner[] temp = read.toArray(new CarOwner[read.size()]); 
    return temp;
}

ArrayList<CarOwner> al = new ArrayList<CarOwner>();
FileOutputStream fos = new FileOutputStream("ItStateBinary.dat");
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(al);

FileInputStream fis = new FileInputStream("ItStateBinary.dat");
ObjectInputStream ois = new ObjectInputStream(fis);
ArrayList<CarOwner> read = (ArrayList<CarOwner>)ois.readObject();

return read.toArray(new CarOwner[read.size()]);