transient

Why is the table attribute of Hashtable serialized?

由 余生长醉 提交于 2019-12-10 18:06:13
问题 Why is the table field of Hashtable serialized, although it is marked as transient ? 回答1: It is marked as transient because it is unsafe to use the default serialization scheme on the Entry array. Rather, when a Hashtable is deserialized, the keys in the table must be rehashed and the entries must be added to slots according to the new hashcode values. This is necessary because the keys may have different hashcodes after deserialization ... for a variety of reasons. This work will be done by

Best method in hiding attribute in JSON serialization from java transient or @Transient annotation? [closed]

由 核能气质少年 提交于 2019-12-10 10:47:20
问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 6 years ago . In Spring, ExtJs application I use JSON serialization of java objects. When I want to exclude a property from JSON, I use @Transient annotation. I see java transient keyword also works with this. I like to know which of these are best and more efficient in performance

Core Data, “sorting by transient property” workaround

由 北慕城南 提交于 2019-12-08 15:27:01
问题 Let's say I have a Core Data entity called Event, which represents recurrent (yearly) events. Each Event has a "date" property. I need to present this events to the user sorted by "next occurrence of date". This property, of course, depends on the current date and as such should be marked as transient : there's no point in storing it in the database. But, as you know, you can't query sorting by a transient property in Core Data. Is there a smart way to keep this property transient and still

How can I use JPQL in a NamedQuery to create an entity having a calculated transient attribute?

由 喜你入骨 提交于 2019-12-08 11:33:38
问题 I have an SQL statement: SELECT x.SPEED, (6371 * acos(cos(radians(16.65555))) * cos(radians(LATITUDE)) * cos(radians(LONGITUDE) - radians(54.55555)) + sin(radians(16.65555)) * sin(radians(LATITUDE))) AS dist FROM MY_TABLE x HAVING dist <= 50 ORDER BY dist How can I put this into a NamedQuery within a Java entity class in a way that the calculated value is set into this entity as a transient attribute called distance ? For the time being I have tried this: SELECT vsle, (:distance_unit * FUNC(

Using time dependent (heat) source in PDE Toolbox

由 ♀尐吖头ヾ 提交于 2019-12-08 09:30:58
问题 My goal is to apply a time-dependent heat source when solving the heat transfer problem. The partial differential equation for transient conduction heat transfer is: and more information can be found here: Solving a Heat Transfer Problem With Temperature-Dependent Properties All parameters are constants in my case, except the source term, f, needs to be changed along with time. I'm following the example code here: Nonlinear Heat Transfer In a Thin Plate which gives a way to solve the

Best method in hiding attribute in JSON serialization from java transient or @Transient annotation? [closed]

由 百般思念 提交于 2019-12-06 13:15:46
Closed . This question is opinion-based . It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post . Closed 6 years ago . In Spring, ExtJs application I use JSON serialization of java objects. When I want to exclude a property from JSON, I use @Transient annotation. I see java transient keyword also works with this. I like to know which of these are best and more efficient in performance perspective and security. I prefer to use annotation based mapping. Because this may dependent on you JSON

ManagedProperty of SessionScope inside a ViewScoped Bean - Transient?

由 限于喜欢 提交于 2019-12-06 01:37:17
问题 I have a JSF Beans structure of this sort: @ManagedBean @ViewScoped public class ViewBeany implements Serializable { .... @ManagedProperty(value='#{sessionBeany}) transient private SessionBeany sessionBeany; ... public getSessionBeany() { ... }; public setSessionBeany(SessionBeany sessionBeany) { ... }; } The reason for the transient is that the session bean has some non-Serializable members and cannot be made Serializable. Will this work? If not, How can I solve the problem of not being able

How transient works with final in Serialization Java

由 谁说胖子不能爱 提交于 2019-12-05 04:23:47
问题 I was reading about transient and final keyword and I found the answer that we can't use transient keyword with final keyword. I tried and got confused because here it working fine. import java.io.FileOutputStream; import java.io.FileInputStream; import java.io.ObjectOutputStream; import java.io.ObjectInputStream; import java.io.Serializable; public class SerExample{ public static void main(String... args){ Student foo = new Student(3,2,"ABC"); Student koo = new Student(6,4,"DEF"); try {

Can a transient field in a class be obtained using reflection

由 帅比萌擦擦* 提交于 2019-12-05 02:48:29
Can a transient field in a class be obtained using reflection? (using getDeclaredField(..) ) Yes , It is a normal field. You can check whether it is transient by: Modifier.isTransient(field.getModifiers()); transient : A keyword in the Java programming language that indicates that a field is not part of the serialized form of an object. When an object is serialized, the values of its transient fields are not included in the serial representation, while the values of its non-transient fields are included. So no logical reason for it not to be accessible by reflection. It's the value of the

iOS - How to refresh/update Core Data transient property?

由 梦想与她 提交于 2019-12-04 23:43:28
问题 I'm using a core data, NSFetchedResultsController UITableView, with a transient NSDate attribute. The main reason I have this as a transient property is so my UITableView entries get put into sections based on NSDate, but can move between the sections when the date changes. So far it seems to work great, but it only updates/refreshes (I'm really new to this, so I don't know if I'm using the correct terminology, sorry!) when I either close the app and kill it from multitasking, or re-run it
订阅 transient