序列化Java中的多个不同对象

顺序写入对象的另一种方法是将它们存储在集合（例如HashMap）中，因为可以序列化集合。这可能会使检索时的管理起来更容易一些，尤其是当您有许多要序列化/反序列化的对象时。以下代码演示了这一点：

    String first = "first";    String second = "second";    HashMap<String, Object> saved = new HashMap<String, Object>();    saved.put("A", first);    saved.put("B", second);    try {        FileOutputStream fos = new FileOutputStream("test.obj");        ObjectOutputStream oos = new ObjectOutputStream(fos);        oos.writeObject(saved);        oos.flush();        oos.close();        fos.close();        FileInputStream fis = new FileInputStream("test.obj");        ObjectInputStream ois = new ObjectInputStream(fis);        HashMap<String,Object> retreived = (HashMap<String,Object>)ois.readObject();        fis.close();        System.out.println(retreived.get("A"));        System.out.println(retreived.get("B"));    } catch (IOException e) {        e.printStackTrace();    } catch (ClassNotFoundException e) {        e.printStackTrace();    }}

运行此命令将导致：

firstsecond