serializable

问题 For example: Object A contains Object B that contains Object C that contains Object A. Will Object A serialize properly? Comment #9 here indicates that it does not work . In contrast, XStream indicates that it does handle cyclic references. 回答1: Yes, the default Java serialization works for cyclic references. When you serialize object C, the field will contain a backreference to the already-serialized object A instead of serializing it again. 回答2: Yes, Java serialization works for circular

问题 My generic method needs to serialize the object passed to it, however just insisting that it implements ISerializable doesn't seem to work. For example, I have a struct returned from a web service (marked with SerializableAttribute) that serializes to xml just fine, but, as expected, the C# compiler complains. Is there a way I can check the object is serializable before attempting to serialize it, or, better still, a way of using the where keyword to check the object is suitable? Here's my

问题 Me and a group of friends are working on a project in Java, and we need some help regarding sending objects through sockets. So far, we have achieved to send simple objects (ints, strings and whatnot) through sockets, using ObjectOutputStream and ObjectInputStream . However, we ran into a huge problem today (huge for us, anyway ^^) We have a tree structure, that we need to send from one PC to another. The problem is that, within each node of that tree, we have a reference to a BufferedImage

问题 Hi i have problem with a class i want to pass in an intent by putting it into the putExtras() Its serializable and the code looks like this: public abstract class ObjectA extends ArrayList<ObjectA> implements java.io.Serializable{...} public class ObjectB extends ObjectA {...} ... Bundle extras = new Bundle(); extras.putSerializable("blabla", ObjectB); intent.putExtras(extras); ... Object y = getIntent().getExtras().get("blabla"); the problem is, that y now is an ArrayList and no longer an

问题 Hi i have problem with a class i want to pass in an intent by putting it into the putExtras() Its serializable and the code looks like this: public abstract class ObjectA extends ArrayList<ObjectA> implements java.io.Serializable{...} public class ObjectB extends ObjectA {...} ... Bundle extras = new Bundle(); extras.putSerializable("blabla", ObjectB); intent.putExtras(extras); ... Object y = getIntent().getExtras().get("blabla"); the problem is, that y now is an ArrayList and no longer an

问题 In Which Cases it is a good coding practice to use implements serializable other than Writing & Reading object to/from file.In a project i went through code. A class using implements serializable even if in that class/project no any Writing/Reading objects to/from file? 回答1: If the object leaves the JVM it was created in, the class should implement Serializable. Serialization is a method by which an object can be represented as a sequence of bytes that includes the object's data as well as

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Why Java needs Serializable interface? According to Serializability in Java docs : Serializability of a class is enabled by the class implementing the java.io.Serializable interface. Classes that do not implement this interface will not have any of their state serialized or deserialized. All subtypes of a serializable class are themselves serializable. The serialization interface has no methods or fields and

问题 In my understanding of Servlet, the Servlet will be instantiated by the Container, its init() method will be called once, and the servlet will live like a singleton until the JVM shuts down. I do not expect my servlet to be serialized, since it will be constructed new when the app server recovers or is starts up normally. The servlet should hold no session-specific members, so it does not make sense for it to be written to disk and re-instantiated. Is there a practical use for this? My

问题 Referring to What is the correct way to make a custom .NET Exception serializable? and Are all .NET Exceptions serializable? ... Why should my exceptions be serializable? Someone said "it can be considered a bug" if a custom exception defined by a third party library, is not serializable. Why? Why are exceptions different than other classes in this regard? 回答1: Because your exceptions may need to be marshalled between different AppDomains and if they aren't (properly) serializable you will

问题 This question already has answers here : Passing arraylist of objects between activities (5 answers) Closed 5 years ago . I want to send Following ArrayList from one activity to another please help. ContactBean m_objUserDetails = new ContactBean(); ArrayList<ContactBean> ContactLis = new ArrayList<ContactBean>(); I am sending the above arraylist after adding data in it as follows Intent i = new Intent(this,DisplayContact.class); i.putExtra("Contact_list", ContactLis); startActivity(i); But I