Re: Sorting TimeZone
Wojtek wrote:
Lew wrote :
Lew wrote :
Map <TimeZone, String> map =
new TreeMap <TimeZone, String> ( new Comparator <TimeZone> ()
{ .... } );
Wojtek wrote:
No arguments that this does work.
However I was replying to your statement "'TimeZone' can easily be a
map
key, yes, even for a 'TreeMap'. " which appears to say that you do not
need a custom Comparator:
Even though I had explicitly mentioned a custom Comparator in the post
to which you were replying? Come on, now. Your explanation is
disingenuous at best.
To me a 'key' is the part which goes into the 'K' part of Map<K,V>.
Yes, that's right.
For a Comparator, the signature is Comparator<T> where the 'T' refers to
a 'Type': http://www.j2ee.me/javase/6/docs/api/java/util/Comparator.html
... which means only that the K in Map<K,V> is the same as
the T in Comparator<T>, or is a subclass/subinterface of T. You
shouldn't read too much into the particular letters chosen to name
type parameters; the names are as arbitrary as those of method
parameters, and carry no deeper meaning.
Does Map<String,String> bother you, because String == String
but K != V? If not, K != T shouldn't bother you, either, even if
you have a Map<Book,Date> and a Comparator<Book> with Book == Book.
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