问题描述
这是我的用例，我有一个逻辑上等于我的HashMap键但不是相同对象（不是==）的对象。我需要从HashMap中取出实体关键对象，以便我可以同步它。我知道我可以遍历ketSet，但与散列相比，这是缓慢的。
Here is my use case, I have an object that is logically equal to my HashMap key but not the same object (not ==). I need to get the actuall key object out of the HashMap so that i can synchronise on it. I am aware that i can iterate over the ketSet, but this is slow in comparison to hashing.
通过java.util.HashMap实现，我看到一个getEntry（Object关键）方法，这正是我需要的。任何想法，为什么这没有被暴露？
Looking through the java.util.HashMap implementation i see a getEntry(Object key) method that is exactly what i need. Any idea why this has not been exposed?
你能想到任何其他方式我可以得到钥匙吗？
Can you think of any other way i can get the key out?
推荐答案
我认为你最好在值上添加额外的间接层。关键还应该是一个纯粹的价值。而不是：
I think you would be better off putting in an extra layer of indirection on the value. The key should also be a "pure" value. Instead of:
Map<ReferenceObjectKey,Thing> map;
使用：
Map<ValueObjectKey,ReferenceObject<Thing>> map;
这篇关于为什么getEntry（Object key）不公开在HashMap上？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！