Re: Why doesn't new Map methods generate entry accesses on LinkedHashMap? [Copy]

[Paul Sandoz]

Hi Roman,

On Dec 8, 2013, at 10:29 PM, Roman Leventov <leven...@ya.ru> wrote:
> Especially getDefault(). Doesn't this violate principle of least 
> astonishment? Details and proof: 
> http://stackoverflow.com/questions/20440136/why-doesnt-new-map-methods-generate-entry-accesses-on-linkedhashmap
> 

Thanks. I believe that all the new (default) Map methods but getOrDefault 
behave correctly. So i think it is a bug, we need to add something like the 
following to LinkedHashMap:

    public V getOrDefault(Object key, V defaultValue) {
        Node<K,V> e;
        if ((e = getNode(hash(key), key)) == null)
            return defaultValue;
        if (accessOrder)
            afterNodeAccess(e);
        return e.value;
    }

and also update the documentation to clarify (via the implementation 
specification of the default methods it can be inferred what the behaviour is, 
but that ain't obvious).

I have logged this bug:

  https://bugs.openjdk.java.net/browse/JDK-8029795

Paul.