[doc]Small modification on the WeakHashMap doc (original) (raw)

David Holmes david.holmes at oracle.com
Mon May 7 03:45:11 UTC 2012

Hi Charles,

On 7/05/2012 1:05 PM, Charles Lee wrote:

Does anyone interested in this issue?

Interest and time are two different things :)

A shorter form would be:

"If the values in the map do not rely on the map holding strong references to them, then one way to deal with this is ...

David

On 05/03/2012 02:52 PM, Charles Lee wrote:

Hi guys,

In the Implementation notes of WeakHashMap[1], says: /One way to deal with this is to wrap values themselves within WeakReferences before inserting, as in: m.put(key, new WeakReference(value)), and then unwrapping upon each get./ However, it is not concise and a little misleading. Because the value in the WeakReference can be GC'd if there are no strong reference to it. This behaviour surprises some customers. How about add a statement like [2]: /However, as the use of WeakReference in this manner will not prevent value objects from being GC'd, this approach is only useful when entries in the map are not relied upon for keeping the underlying value objects "live"./

[1]: http://docs.oracle.com/javase/7/docs/api/java/util/WeakHashMap.html [2]: http://cr.openjdk.java.net/~littlee/7166055/webrev.00/ <http://cr.openjdk.java.net/%7Elittlee/7166055/webrev.00/>

More information about the core-libs-dev mailing list