如何在Java和Android开发使用的WeakReference？ [英] How to use WeakReference in Java and Android development?
问题描述
我一直是Java开发人员2年。
I have been a java developer for 2 years.
不过，我从来没有在我的code写一个WeakReference的。如何使用WeakReference的，使我的应用程序更有效率尤其是Android应用？
But I have never wrote a WeakReference in my code. How to use WeakReference to make my application more efficient especially the Android application?
推荐答案
使用的WeakReference 在Android中并不比普通的Java使用一个有什么不同。这是一个伟大的指南，给出了详细的解释：理解弱引用
Using a WeakReference in Android isn't any different than using one in plain old Java. Here is a great guide which gives a detailed explanation: Understanding Weak References.
您应该考虑使用一个，只要你需要引用一个对象，但你不希望出现这种情况的参考，以保护对象从垃圾收集器。一个典型的例子是，你要被垃圾回收时，内存占用过高的高速缓存（通常与实施的WeakHashMap ）。
You should think about using one whenever you need a reference to an object, but you don't want that reference to protect the object from the garbage collector. A classic example is a cache that you want to be garbage collected when memory usage gets too high (often implemented with WeakHashMap).
一定要看看 SoftReference 和的PhantomReference 和
编辑：汤姆提出了一些担忧与实施的WeakHashMap 缓存。这是一篇文章奠定了存在的问题：<一href="http://www.$c$cinstructions.com/2008/09/weakhashmap-is-not-cache-understanding.html">WeakHashMap是不是缓存！
Tom has raised some concerns over implementing a cache with WeakHashMap. Here is an article laying out the problems: WeakHashMap is not a cache!
汤姆是正确的，有过投诉有关不佳Netbeans的性能，因为 WeakHashMap中缓存。
Tom is right that there have been complaints about poor Netbeans performance due to WeakHashMap caching.
我仍然认为这将是一个很好的学习经验，以实现与高速缓存的WeakHashMap ，然后针对与
I still think it would be a good learning experience to implement a cache with WeakHashMap and then compare it against your own hand-rolled cache implemented with SoftReference. In the real world, you probably wouldn't use either of these solutions, since it makes more sense to use a 3rd party library like Apache JCS.
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