如何在序列化到 GWT AutoBean 时保留 LinkedHashMap 的顺序？
我尝试过使用 Map、HashMap 和 LinkedHashMap 作为 AutoBean 工厂的类型，并且总是在序列化之后更改初始元素顺序。
我不想发送额外的 ArrayList 来保存订单数据。有没有办法强制 AutoBean 在 Map 中保持顺序？
I've tried using Map, HashMap and LinkedHashMap as a type for AutoBean factory and always after serializing it's changing initial elements order.
I don't want to send additional ArrayList that will hold the order data. Is there a way to force AutoBean to keep order in a Map?
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http://docs.oracle.com/javase/6 /docs/api/java/util/Map.html
GWT 不会对基于
Map的类进行任何更改。出于性能原因，Map及其许多子类不保留插入顺序。LinkedHashMap根据设计，确实保持其插入顺序。当然，假设您开始使用LinkedHashMap并且不是从另一种类型的Map构建它，而后者实际上可能不会保留其插入期间的顺序，导致LinkedHashMap的顺序与您预期的顺序不同。我想知道为什么你需要保留初始顺序，如果这是你想要的，为什么要使用
Map？http://docs.oracle.com/javase/6/docs/api/java/util/Map.html
GWT doesn't make any alterations to
Map-based classes.Mapand many of its subclasses do not keep order of insertion for performance reasons.LinkedHashMap, by design, does keep its insertion order. That is, of course, assuming you're starting with aLinkedHashMapand not constructing it from another type ofMapwhich may not actually preserve its order during the insertion, causing theLinkedHashMapto have a different order than you're expecting.I'm wondering why you need to keep the initial order anyway, and why are you using
Mapif that's what you want?显然，至少在 GWT 2.4 中，GWT 中的
LinkedHashMap.clone()返回一个HashMap，这与纯 Java 行为相反。 AutoBean 可能依赖于clone()，这最终打乱了顺序。Apparently, and at least in GWT 2.4,
LinkedHashMap.clone()in GWT returns aHashMap, in contrast to pure Java behavior. AutoBean probably relies on clone() which messes up the order in the end.