new String 2005-10-17 - By Muzaffer G?RSOY
Back
this may help;
String s1="aString";
String s2="aString";
String s3=new String("aString");
String s4=new String("aString");
s1==s2 // TRUE
s1==s3 // FALSE
s1==s4 // FALSE
s3==s4 // FALSE <--- here
Frans is absolutely right ;)
>From: Mark Galbreath <mgalbreath@(protected)>
>Reply-To: mgalbreath@(protected)
>To: J2EE-INTEREST@(protected)
>Subject: Re: new String
>Date: Mon, 17 Oct 2005 08:14:08 -0400
>
>This is not true. Since strings are immutable, a new string instances will
>be created no matter what method is used. The two are equivalent.
>
>Cheers,
>Mark
>
>
>Frans Verhoef wrote:
>
>>Hi,
>>String s1 = "test" is definitely preferred, as the other version creates
>>two objects containing "test". Also, when you assign many times "test" to
>>a string object, than only one string is created in memory, while if you
>>use new String("test"), a new string is created every single time.
>>
>>For example:
>>
>>String[] s = new String[1000000];
>>for (int i=0; i<1000000; i++) s[i] ="test"; // uses hardly any memory
>>
>>for (int i=0; i<1000000; i++) s[i] = new String("test"); // uses lots of
>>memory, as each time a new string is created
>>
>>Cheers,
>>Frans
>>
>>On Sun, 16 Oct 2005 16:00:49 +0530, KR Kumar wrote:
>>
>>
>>>Hi,
>>>
>>>Plz let me know which one is better in terms of performace between
>>>the two of the following approaches for string initialization
>>>
>>>String s1 = new String(?test?)
>>>
>>>Or
>>>
>>>String s1 = ?test?
>>>
>>>Kumar
>>>======================================================================
>>>===== To unsubscribe, send email to listserv@(protected) and
>>>include in the body of the message "signoff J2EE-INTEREST". For
>>>general help, send email to listserv@(protected) and include in
>>>the body of the message "help".
>>>
>>>
>>
>>===========================================================================
>>To unsubscribe, send email to listserv@(protected) and include in the
>>body
>>of the message "signoff J2EE-INTEREST". For general help, send email to
>>listserv@(protected) and include in the body of the message "help".
>>
>>
>>
>>
>
>===========================================================================
>To unsubscribe, send email to listserv@(protected) and include in the body
>of the message "signoff J2EE-INTEREST". For general help, send email to
>listserv@(protected) and include in the body of the message "help".
===========================================================================
To unsubscribe, send email to listserv@(protected) and include in the body
of the message "signoff J2EE-INTEREST". For general help, send email to
listserv@(protected) and include in the body of the message "help".
|
|
