serializable

I keep getting java.io.NotSerializableException: java.io.ObjectOutputStream

由 走远了吗. 提交于 2020-01-13 17:03:47
问题 This is the code that I have been trying import java.util.Scanner; import java.io.*; abstract class Account implements Serializable { protected String accountHolderName; protected long balance; protected ObjectOutputStream accData; Scanner input = new Scanner(System.in); } class Savings extends Account implements Serializable { Savings() throws IOException { System.out.print("enter your name: "); accountHolderName = input.nextLine(); System.out.print("\n"); System.out.print("enter your

I keep getting java.io.NotSerializableException: java.io.ObjectOutputStream

由 ≡放荡痞女 提交于 2020-01-13 17:03:10
问题 This is the code that I have been trying import java.util.Scanner; import java.io.*; abstract class Account implements Serializable { protected String accountHolderName; protected long balance; protected ObjectOutputStream accData; Scanner input = new Scanner(System.in); } class Savings extends Account implements Serializable { Savings() throws IOException { System.out.print("enter your name: "); accountHolderName = input.nextLine(); System.out.print("\n"); System.out.print("enter your

Why does PostgreSQL serializable transaction think this as conflict?

由 走远了吗. 提交于 2020-01-12 06:45:13
问题 In my understanding PostgreSQL use some kind of monitors to guess if there's a conflict in serializable isolation level. Many examples are about modifying same resource in concurrent transaction, and serializable transaction works great. But I want to test concurrent issue in another way. I decide to test 2 users modifying their own account balance, and wish PostgreSQL is smart enough to not detect it as conflict, but the result is not what I want. Below is my table, there're 4 accounts which

Can I send custom objects to Android Wear?

由 ￡可爱￡侵袭症＋ 提交于 2020-01-12 01:49:32
问题 I am just learning how to develop for Android Wear, I have created a full screen Activity for Smart Watches and in my mobile part of the application I get some JSON data and create a list of custom objects from this. On my mobile app I show the information for these objects in a ListView. On the Wear piece of my application I want to show a limited version of this list, for example the top 3 from the list will be show on my full screen app on the Wearable. My problem is that there doesn't

What does Serializable mean?

由 女生的网名这么多〃 提交于 2020-01-08 12:00:13
问题 What exactly does it mean for a class to be Serializable in Java? Or in general, for that matter... 回答1: Serialization is persisting an object from memory to a sequence of bits, for instance for saving onto the disk. Deserialization is the opposite - reading data from the disk to hydrate/create an object. In the context of your question, it is an interface that if implemented in a class, this class can automatically be serialized and deserialized by different serializers. 回答2: Though most of

Findbugs Bug SE_BAD_FIELD on boolean field

由 为君一笑 提交于 2020-01-05 07:52:12
问题 We have Findbugs configured to run on our Jenkins via Maven. Among other things it complains about SE_BAD_FIELD on the following code line: private boolean logged = false; The description of this bug says Se: Non-transient non-serializable instance field in serializable class (SE_BAD_FIELD) This Serializable class defines a non-primitive instance field which is neither transient, Serializable, or java.lang.Object, and does not appear to implement the Externalizable interface or the readObject

Which classes must implement the Serializable interface?

由 血红的双手。 提交于 2020-01-05 04:04:24
问题 I want to send an object via socket, so I have to implement Serializable. But my class is a compound class, like this simple code: class B{ private int a; public B(int aa){a=aa;} } class A { private B b; public A(B b1){ b=b1;} } I want to send an object of class A, with all it's contents such as the B object inside. Which classes should implement Serializable? just A, or both A and B? Addition: How about vectors? Think that I have a Vector of B in A like this: class A { private Vector bvector

ASP.NET MVC - Serializable

由 谁说我不能喝 提交于 2020-01-03 04:54:07
问题 I'm trying to use the new Html helper extension Serialize() from the furthure assembly.. If you take a look at: View <%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<List<MvcApplication2.Models.ProductViewBinding>>" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <%@ Import Namespace="Microsoft.Web.Mvc" %>> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server"> <title>Index</title> <

What's the difference between Serialization and simply store the object on disk?

由 不羁的心 提交于 2020-01-01 07:06:42
问题 I am confused about this. Since when doing implementation of Serializable class, we need to use classes like FileOutputStream , ObjectOutputStream or something like that. Then why not we just use those classes to do things like output a object to a file and input a object from a file to maintain the status of a object directly? Why should we first implement Serializable and then do the same thing? 回答1: Understand it like this... Serializable is marker interface which denotes that the object

parcelable encountered ioexception writing serializable object…?

由 纵然是瞬间 提交于 2019-12-31 00:58:09
问题 The code SngList.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView a, View v, int position, long id) { Intent intent = new Intent(getActivity(), NowPlaying.class); intent.putExtra("Data1",Songinfo); intent.putExtra("Data2",position); startActivity(intent); } }); code in the receiving class Intent i = getIntent(); ArrayList<SongDetails> Songinfo2 = (ArrayList<SongDetails>)i.getSerializableExtra("Data1"); position=i.getIntExtra("Data2", 1); code for
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