No prave proto mi to prislo divne, ten priklad se slovnikem.
----- Original Message -----
From: "Pavel Kubal" <[EMAIL PROTECTED]>
To: "Java" <[email protected]>
Sent: Thursday, July 27, 2006 4:15 PM
Subject: Re: equals a hashCode (WAS: java.security.Permission)
API dokumentace pravi :
metoda put() :
Associates the specified value with the specified key in this map
(optional
operation). If the map previously contained a mapping for this key, the
old
value is replaced by the specified value. (A map m is said to contain a
mapping for a key k if and only if m.containsKey(k) would return true.))
Jak by mohla mit mapa vic objektu pro jeden klic?
Pavel Kubal
----- Original Message -----
From: "Kamzik-II" <[EMAIL PROTECTED]>
To: "Java" <[email protected]>
Sent: Thursday, July 27, 2006 4:15 PM
Subject: Re: equals a hashCode (WAS: java.security.Permission)
V tom pripade teda nechapu, jak muze hashtable mit
vic objektu pro jeden klic, kdyz je to vlastne implementace hashmapy,
ktera
je odvozena od map?
----- Original Message -----
From: "Pavel Kubal" <[EMAIL PROTECTED]>
To: "Java" <[email protected]>
Sent: Thursday, July 27, 2006 4:09 PM
Subject: Re: equals a hashCode (WAS: java.security.Permission)
> Ne;-)
>
> ----- Original Message -----
> From: "Kamzik-II" <[EMAIL PROTECTED]>
> To: "Java" <[email protected]>
> Sent: Thursday, July 27, 2006 4:11 PM
> Subject: Re: equals a hashCode (WAS: java.security.Permission)
>
>
>> no equals a hashcode uz chapu ;-)
>> jeste jedna otazka ohledne kolekci, muze
>> kolekce Map mit pro jeden klic vice objektu?
>>
>>
>> ----- Original Message -----
>> From: "Stanislav Ošmera" <[EMAIL PROTECTED]>
>> To: "Java" <[email protected]>
>> Sent: Thursday, July 27, 2006 4:04 PM
>> Subject: Re: equals a hashCode (WAS: java.security.Permission)
>>
>>
>> > Mimo jine se doporucuje aby funkce ktera vraci hashcode byla velmi
>> > jednoducha a rychla protoze se pouzije jako prvni a nejcasteji (kdyz
>> > je ruzny hashcode tak se jiz dale nic nezjistuje)
>> > A az pak funkce equals muze byt velmi slozita na vyhodnoceni.
>> > Napriklad mam slozity objekt ktery ma spoustu atributu. Hashcode
>> > vytvorim jen treba pouzitim 3 z nich ktery jsou primitivni typy,
>> > kdezto pri equals porovnavam vsechny atributy a to u nekterych muze
>> > znamenat porovnavani jinych objektu s podobnou slozitosti.
>> >
>> > Ale opravdu bude lepe si precist nejakou knizku o tehlech hlavnich
>> > algoritmickych myslenkach ktere jsou v Jave, ten zminovany Bloch je
>> > treba zrovna na tohle vyborny.
>> >
>> > P.S. jinak tomu spojeni equal a hashCode se rika equals contract
>> > --
>> > Stanislav Ošmera
>> > Work: +44 (0)2075 980 348
>> > Cell: +44 (0)7914 635 412
>> >
>>
>>
>>
>>
>>
>>
>>
>
>
>
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