Java-读写对象

Question

我有以下代码，

equalOr()

但是当我要测试它时，它给了我错误：

public void writeToStream(OutputStream out) {
    try {
        ObjectOutputStream oos = (ObjectOutputStream) out;
        oos.writeObject(root);
        oos.close();
    } catch (Exception e) {
        System.err.println("Caught Exception: " + e.getMessage());
    }
}

public void readFromStream(InputStream in) {
    try {
        ObjectInputStream ois = (ObjectInputStream) in;
        root = (Node<T>) ois.readObject();
        ois.close();
        in.close();
    } catch (Exception e) {
        System.err.println("Caught Exception: " + e.getMessage());
    }
}

它给了我错误：FileOutputStream fos; try { fos = new FileOutputStream("object"); ObjectOutputStream oos = new ObjectOutputStream(fos); tree.writeToStream(oos); oos.close(); fos.close(); } catch (FileNotFoundException ex) { Logger.getLogger(Exercise4.class.getName()).log(Level.SEVERE, null, ex); } BinaryTree<Integer> tree2 = new BinaryTree<Integer>(); FileInputStream fis; try { fis = new FileInputStream("Object"); ObjectInputStream ois = new ObjectInputStream(fis); tree2.readFromStream(ois); ois.close(); fis.close(); for (int i : tree2) { System.out.println(i); } } catch (FileNotFoundException ex) { Logger.getLogger(Exercise4.class.getName()).log(Level.SEVERE, null, ex); }

错误是由遍历空对象引起的-从文件读取的对象为空。

写入文件和从文件读取的对象必须相等。

感谢您的帮助。