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Struts & Hibernate
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| | | java code performance enhancement. | java code performance enhancement. 2004-09-24 - By Manish Malhotra
Back
Hi All,
Greet...
Please give me the list or some important points for the core java / ejb /
jsp code performance enhancement.
And one basic question.
Please see the following is the code snippet
:
for (int i = 0; i < array.length; i++)
{
final String priority = (String)
dataMap.get(SMSGConstants.SMSG_MESSAGE_PRIORITY);
LogWriter.logDebugMessage("priority: " + priority);
// Get the app name
final String appName = (String)
dataMap.get(SMSGConstants.SMSG_APPLICATION_NAME);
LogWriter.logDebugMessage("appName: " + appName);
LogWriter.logDebugMessage("CountryCOde: " +
SMSGUtil.getIntValue(SMSGUtil.checkNull((String) dataMap.get
(SMSGConstants.SMSG_COUNTRY_ISD_CODE))));
// Get the CC
final int countryISDCode =
SMSGUtil.getIntValue(SMSGUtil.checkNull((String) dataMap.get
(SMSGConstants.SMSG_COUNTRY_ISD_CODE)));
SPConfigKey spConfigKey = new SPConfigKey
(countryISDCode, appName,
priority);
}
The point which I want to ask is as I declared the vars priority, appName,
countryISDCode as final and in this loop.
Now consider this case If I declare these vars outside this loop and
obviously not final.
Performace and space vise which is better?
For the former type I give favour because I think that if I declare a var.
in a block( in this case its a loop) then as soon as one iteration cmopletes
all its vars are eligible for garbage collection. So, whatever the no. of
var. or objects created in the loop all are eligible for GC. Is it correct?
And one more question If 'll not declare these vars as const then what's the
difference. Is final object / var. takes lessa space or performance wise
good.
I dont have any idea about this.
Please do give the answers so that we ca start this interesting topic
thread.
Many Thanks.
regards,
Manish
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