为什么getEntry（Object key）没有在HashMap上公开？(Why is getEntry(Object key) not exposed on HashMap?)

为什么getEntry（Object key）没有在HashMap上公开？(Why is getEntry(Object key) not exposed on HashMap?)

这是我的用例，我有一个逻辑上等于我的HashMap键但不是同一个对象（不是==）的对象。 我需要从HashMap中获取实际键对象，以便我可以在其上进行同步。 我知道我可以遍历ketSet，但与散列相比，这是缓慢的。

通过java.util.HashMap实现，我看到了一个正是我需要的getEntry（Object key）方法。 知道为什么没有曝光吗？

你能想到我能把钥匙拿出来的其他任何方式吗？

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.

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?

Can you think of any other way i can get the key out?

最满意答案

我认为你最好在值上添加一个额外的间接层。 关键也应该是一个“纯粹”的价值。 代替：

Map<ReferenceObjectKey,Thing> map;

使用：

Map<ValueObjectKey,ReferenceObject<Thing>> map;

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;

Use:

Map<ValueObjectKey,ReferenceObject<Thing>> map;