天道酬勤,学无止境

serializable

Getting rid of the comment above Eclipse-generated serialVersionUID

This has become a pet peeve of mine. I write a class, and implement Serializible. Then eclipse warns me that I don't have a serialVersionUID, so I select "Add generated serialVersionUID" or "Add default serialVersionUID" and I end up with something like this: /** * */ private static final long serialVersionUID = 4049849541314027178L; Most of the time I don't want to add a comment, so I have to go and delete the comment. I would rather the default be no comment, but I've looked through the code templates in preferences and haven't figured out how to change this. I simply want it to look like

2021-06-13 03:35:37    分类:问答    java   eclipse   comments   serializable   serialversionuid

我可以将自定义对象发送到 Android Wear 吗?(Can I send custom objects to Android Wear?)

问题 我只是在学习如何为 Android Wear 进行开发,我为智能手表创建了一个全屏 Activity,在应用程序的移动部分,我获取了一些 JSON 数据并从中创建了一个自定义对象列表。 在我的移动应用程序上,我在 ListView 中显示这些对象的信息。 在我的应用程序的 Wear 部分,我想显示此列表的有限版本,例如列表中的前 3 个将显示在我的可穿戴设备上的全屏应用程序中。 我的问题是似乎没有办法将 Parcelable 对象发送到 Android Wear,在 DataItem 中没有放置 Parcelable 的选项。 看起来唯一的选择是以字节为单位发送对象,如下所示: public void sendWearableData(GoogleApiClient aGoogleApiClient, ArrayList<MyObject> myObjectList, String path) { googleApiClient = aGoogleApiClient; byte[] testBytes = new byte[0]; if (googleApiClient.isConnected()) { PutDataMapRequest dataMapRequest = PutDataMapRequest.create(path); try { testBytes =

2021-06-12 14:05:08    分类:技术分享    android   parcelable   serializable   wear-os   android-wear-data-api

Parceable encountered IOException writing serializable object

I am getting this error : FATAL EXCEPTION: main java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = game.Level) at android.os.Parcel.writeSerializable(Parcel.java) at android.os.Parcel.writeValue(Parcel.java) at android.os.Parcel.writeMapInternal(Parcel.java) at android.os.Bundle.writeToParcel(Bundle.java) at android.os.Parcel.writeBundle(Parcel.java) at android.content.Intent.writeToParcel(Intent.java) at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java) at android.app.Instrumentation.execStartActivity(Instrumentation

2021-06-11 18:16:00    分类:问答    android   ioexception   parcelable   serializable

通过意图传递可序列化对象(Pass serializable object throught intent)

问题 这是我第一次尝试寻求解决我的问题的方法,所以请尽量成为好人! 我通过简单的搜索找到了许多解决我在这个网站上处理的问题的方法,但这次我想我没有运气。 我发现没有什么适合我的问题,所以我结束了提出一个新问题。 我正在尝试将对象通过意图从一个活动传递到另一个活动。 我有一个抽象类和两个子类(其中一个也是抽象的),如下所示。 我需要它们是抽象的。 我删除了很多代码(抽象方法等)只是为了找出问题所在,最终我得到了这些非常简单的类,但我仍然遇到同样的问题。 public abstract class MyObject { private boolean New; private boolean Modified; public MyObject() { New = true; } public boolean isNew() { return New; } protected void setNew(boolean value) { New = value; } protected boolean isModified() { return Modified; } protected void setModified(boolean value) { Modified = value; } } public abstract class MyItemBase extends

2021-06-10 21:06:32    分类:技术分享    android   android-intent   serializable

Why does PostgreSQL abort this serializable schedule

Theory states that a group of concurrent transactions is serializable if, and only if, their concurrent execution is equivalent to one of their possible serial executions. Now the following concurrent execution of transactions T1 and T2 is serializable, because it is equivalent to the serial execution "T1 then T2" T1: r1x w1y c1 T2: w2x c2 (i.e., T1 reads x, T2 writes x, T1 writes y, T2 commits, and finally, T1 commits) However, when tried in PostgreSQL 10.4, like this: T1: begin T1: set transaction isolation level serializable; T2: begin T2: set transaction isolation level serializable; T2

2021-06-10 08:07:23    分类:问答    postgresql   concurrency   transactions   serializable

java standard serialization order

I want to know in which order the attributes of the following example class would be serialized: public class Example implements Serializable { private static final long serialVersionUID = 8845294179690379902L; public int score; public String name; public Date eventDate; } EDIT: Why i wanna know this: I got a serialized string in a file for a class of mine which has no implementation for readObject() or writeObject(). now that implementation changed ( some properties are gone ) and i want to write a readObject() method that handles the old serialized class. There i would just read this

2021-06-09 15:55:56    分类:问答    java   serialization   serializable

“冲突可序列化”和“冲突等效”有什么区别?(What is the difference between “conflict serializable” and “conflict equivalent”?)

问题 在数据库理论中,“冲突可序列化”和“冲突等效”有什么区别? 我的教科书中有一节是关于可序列化冲突的,但忽略了冲突等价性。 大概这两个概念我都很熟悉,但是我对术语不熟悉,所以我正在寻找解释。 回答1 仅用两个术语以不同的方式描述一件事。 冲突等价:您需要说附表 A 与附表 B 的冲突等价。它必须涉及两个时间表 Conflict serializable : 仍然使用 Schedule A 和 B。我们可以说 Schedule A 是冲突可序列化的。 附表 B 是冲突可序列化的。 我们没有说 Schedule A/B 是冲突等价的 我们没有说 Schedule A 与 Schedule B 发生冲突 回答2 DBMS 中的冲突可以定义为两个或多个不同的事务访问同一变量,并且其中至少一个是写操作。 例如: T1: Read(X) T2: Read (X) 在这种情况下没有冲突,因为两个事务都只执行读取操作。 但在以下情况下: T1: Read(X) T2: Write(X) 有冲突。 假设我们有一个时间表S ,我们可以重新排列其中的指令。 并创建另外 2 个计划S1和S2 。 冲突等效:指的是调度S1和S2 ,它们在两个调度中维护冲突指令的顺序。 例如,如果T1在T2将X写入S1之前必须读取X ,那么它在S2也应该相同。 (应该只为冲突的操作维护排序)。 冲突可串行化

2021-06-09 09:47:35    分类:技术分享    database   conflict   serializable   equivalence

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

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?

2021-06-03 10:01:22    分类:问答    java   serialization   serializable   fileoutputstream   objectoutputstream

Issue with declaration of Map<String,Class<? extends Serializable>>

Java provides me by <? extends class> a way of filtering the java classes that you can use to build in this case the new HashMap, for example: I can do that: Map<String,? extends Serializable> map1 = new HashMap<String,String>(); It is correct, because String implements Serializable, so the compiler let me do that. But when i try to do it: Map<String,GenericClass<? extends Serializable>> map2 = new HashMap<String, GenericClass<String>>(); Being the GenericClass as it: public class GenericClass<T> { . . . } The compiler throw an error saying: Type mismatch: cannot convert from HashMap<String

2021-06-03 03:05:56    分类:问答    java   generics   hashmap   extends   serializable

Realm.io(Android)中包裹(@Parcel)的使用(Usage of parceler (@Parcel) with Realm.io (Android))

问题 我有以下代码会产生错误: Error:Parceler: Unable to find read/write generator for type io.realm.Realm for io.realm.RealmObject.realm 在不extends RealmObject ,一切正常,但是我想使用Realm轻松地将其放入数据库。 有没有一种方法可以排除RealmObject字段,而只对@Parcel使用基本的pojo字段? @Parcel public class Feed extends RealmObject{ int id; public String text; public String time_created; String time_modified; int comments_count; int likes_count; String feed_type; int obj_id; String image; String user_name; String user_earthmile_points; boolean liked; boolean commented; boolean is_private; String url; int feed_creator_id; } 回答1 编辑#2 :实际上,我找到了一种使其工作:)的方法。

2021-06-01 02:34:35    分类:技术分享    android   parcelable   serializable   realm   parceler