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From: Eric Sosman <esosman@comcast-dot-net.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: how does one explain this syntax?
Date: Mon, 23 May 2016 07:32:36 -0400
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On 5/23/2016 1:13 AM, Knute Johnson wrote:
> On 5/22/2016 13:22, Robert Klemme wrote:
>> And why not do this instead?
>>
>>     for (final Entry<Integer, String> entry : tmap.entrySet())
>>       System.out.printf("key is: %d & value is: %s\n", entry.getKey(),
>> entry.getValue());
>>
>> Note: tmap.get(key) is usually less efficient than fetching the value
>> from an Entry.
>>
>> Kind regards
>>
>>     robert
>
> I'll bite, why is it less efficient?

     It doesn't need to re-search the map.

     Admittedly, Map.Entry is an interface rather than a class, so
it's not a given that the getKey() and getValue() implementations
are one-liners.  It seems highly likely, though -- and in the case
of TreeMap, both methods are in fact trivial.

-- 
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM