在Java中将对象的临时成员反序列化为非null的默认值

Question

public class MyObj implements Serializable {
  private transient Map<String, Object> myHash = new HashMap<String, Object>();
  ...
}

有什么方法可以确保当对上述类的对象进行反序列化时，成员myHash将被设置为新的空Map，而不是被设置为null？

Answer 1

public class MyObj implements Serializable {
    private transient Map<String, Object> myHash = new HashMap<String, Object>();

    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        in.defaultReadObject();

        myHash = new HashMap<String, Object>();
    }
}