Difference between having "com.sun" prefix

i'm new to java and i was just wondering what is the difference or effect of having the prefix "com.sun" at any of the import package files? like "com.sun.javax.swing.*;" for example...

dinawanao wrote:
what does "com.sun" mean? what is it?It's just part of a package name. You can name packages whatever you want. Sun's suggestion, and the generally accepted convention, is to begin your package names with your domain name in reverse order. So if I'm working jverd.com, and I'm creating a statistics package, I'd call it com.jverd.statistics. Similarly, a package name that starts with com.sun just means that package came from sun.com. Classes in the core API that start with com.sun are not intended for public use, and could change or go away with any release.
The main exception to the naming convention is that package that are part of the core Java API and that are intended for general use start with java or javax, where just plain java means it's "really, really core," and javax means it's an "extension" that was added on later. Some stuff has moved from javax to java I think, and there's more (like Swing) that is now probably "core" enough that it could move, but I don't think they want to break compatibility. So for all intents and purposes, java and javax more or less mean the same thing--part of the JSE API.
Again, the name itself means nothing at all to Java. One package name is the same as any other. With one exception.
All classes in the java.lang package are automatically imported. This means that you don't have to use an import statement to refer to them by their simple class name (as opposed to the fully qualified name).
So, to your original question, I would be surprised if there is in fact com.sun.javax.swing. However, if there is, the following are true: 1) That package name means nothing special to Java, and 2) You should not be referring to it in your code.

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What's the difference between MSJVM and SUN JVM

Sometimes I can run a program under MSJVM more stable (faster) than that under SUN JVM. Would you please tell me why or tell some difference between them?? Many thanks.
Edited by: ericfok on Dec 5, 2008 8:48 AM

vitallis wrote:
MSJVM has JNI ver. 1.1. My JNI wrapper generator also supports it. I wrote JNI code for MSJVM in 2000.No you didn't.
You either used the MS VM linkage format, which resembles (strongly) how C# does it or you were not using the MS VM but rather the Sun one.
The fact that MS Java supported third party dlls does not make it JNI. JNI was a specific specification on exactly how such support would be provided. And MS Java did not have it.
References, search for "microsoft"
[http://www.javaworld.com/javaworld/jw-10-1999/jw-10-jni.html]
The following from Microsoft itself asserting that JNI cannot be required part of java. Search for "JNI". Presumably if MS was claiming that it wasn't required then obviously they knew that it wasn't in fact in there.
[http://www.microsoft.com/presspass/legal/10-21copyright.mspx]

I am wanting to buy and Ipad.. but I would like to know the difference between having wifi and a simcard..if someone could explain this to me.. and the benefits of both I would appreciate it.

Good Morning:
I have been looking at the Ipads for a while now. I have some concerns though. First, I am NOT a techy of any kind!! So my question is; What is the difference between wifi and a simcard(?) What I understand about wifi is...if you are in an area with free internet.. you can excess it. If not, then you can't. What is a simcard? Is this what you would use like a turbo stick..such as internet on the go... or is this a data plan for the Ipad, like I have for my phone? If so, I take it that it would mean a monthly bill of what or however I set it up... Please be kind with your responces.. I am a older person who wants a new gadget.
Thank you

Hi, Sarah,
You don't really compare a SIM card directly with WiFi. What a SIM card indicates is that a device is designed to connect to cellphone service, in the case of an iPad a data-only service for connection to the Internet. The SIM card works with a technology called GSM (don't worry about what that means); the SIM card is just how the iPad is identified to the cell carrier (in the US, that would be AT&T).
Your choices of connecting an iPad to the Internet are therefore:
WiFi - wireless network connection which uses a device referred to as a "hotspot" or "access point" (and sometimes a "wireless router") with an Internet service provided by some other company. You may have this at home, with your own WiFi router and Internet service, or it may be found by some other location, such as a coffee shop. Cost of WiFi at home would only be the cost of the router and the fee you pay to your Internet provider. Other locations may or many not involve a cost. The advantage of a WiFi connection is speed (compared to a cellular data service) and cost (no monthly fee other than your Internet provider). The disadvantage is that you have to be in range of a WiFi service; that range is usually on the order of 100 feet or so.
Cellular - this is a service provide by a cellphone carrier. This allows you to have your iPad connected to the Internet wherever the carrier offers service, which may be in buildings, parks, while driving, etc. just as with a cellphone. You pay a monthly fee to the cell carrier for this service. The advange is of course that it's available in many places. The primary disadvantages are the monthly cost and slower speed in the connection to the Internet.
You can have both with an iPad if you purchase your iPad with both systems included; iPads are sold WiFi-only or WiFi+3G ("3G" refers to being capable of connecting to a cell network) You are not obligated to sign up with a cell carrier if you buy the iPad with that technology; most carriers allow you to sign up month-by-month, and in some countries the carrier has a pay-as-you-go service. If you tell us what country you're in, someone can tell you more about the available cell plans, if you're interested.
I hope this helps. Feel free to post back if you need further clarification or have additional questions.
Regards.

The Differences of JWS and Sun One?

I am quite confused on the difference between JWS and SUN one? Is JWS part of Sun One?
And, I am also confused on J2EE and JWS? Can JWS utilize the backend of J2EE, that say, ejb?
Your help will be much appreciated.

I am quite confused on the difference between JWS
and SUN one? Is JWS part of Sun One?Sun ONE (Open Network) is a name for the web centric infrastructure Sun wants to arrive at:
http://www.sun.com/software/sunone/faq.html#1
Don't think of this as a already 100% worked out
plan. Parts are there, parts are planned, parts are
open.
Java Web Start is a technology for beaming
Java applications (full apps, applets, ..) to
client machines over the Web.
A very useful thing.
Yes, Sun mentions it together with Sun ONE:
http://www.sun.com/software/sunone/portfolio/plat.html
And, I am also confused on J2EE and JWS? Can JWS
utilize the backend of J2EE, that say, ejb?As far as I understand J2EE and its Enterprise Java Beans, they are intended to run on server machines.
Web Start is intended for beaming Java apps to
client machines in the first place, allowing a very
easy installation/update which just needs a mouse click from a web page by the user to get done (once Web Start has been installed on the client).
While it might be possible to use Web Start in
some favourable way in the context of server
administration, I doubt that those admins
will use it right now. If, it most likely turn up
in the shape of special jnlp clients, that use
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Regards,
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What is difference between GL and PA period common and GL and PA period is

Hi Experts,
Can you please help me in understanding the difference between having common PA and GL period and uncommon PA and GL period. I am only aware of common PA and GL period where in implementation option there is one check box which need to check to make sure that you are using common PA and GL period.
As per my understanding, if u open the GL period in GL module then you can able to copy those GL period in PA module.
So once you open the GL period in PA module accordingly your PA period will also get open.
Please confim my understanding is correct or not.
On the other hand how is uncommon PA and GL period works? I mean in which buisness scenario you will use uncommon PA and GL period?
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Any help on this topic is appreciated.
Regards
and Thanks in Advance :-)

Hi
Your understanding of the common GL and PA period is correct. That means the period start date and end date are the same in both modules. You open a period in GL and it is open for PA as well. You can close the period in PA, so no new transactions will hit that period in PA. On the same time that period may still be open in GL, in case you need to capture journals from other sources or enter manual journals directly in GL. You should not close a period in GL before closing it in PA, AP, AR, PO etc... You can expect to see that for most PA transactions, the value of the PA period and the GL period are the same.
Some companies manage projects by weekly periods and not by months. In that case, the PA periods are separate and different from the monthly GL periods. You need to open and close the periods independently in each of the modules. A transaction will get to separate attributes, the PA period value and the GL period value.
Dina

Difference between SUN JDK V1.4.2_05 and JDK V1.4.2_07

difference between SUN JDK V1.4.2_05 and JDK V1.4.2_07 and I want to the link in SUN for that. I want to know the bug fixes between them.

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Hi All,
Would like to know whats the difference between view only and read permission.
As per my requirement, my end users who have been assigned View Only should NOT be able to Download the document from a doc lib.Whereas who have Read permissions should be able to download.
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how this will be true? MS says that this is not possible if it contains server side handlers.
my customer worried about the download-the-document part. as per them end users who have view only permissions should not download the docs.

Hi,
Please check this similar thread:
https://social.technet.microsoft.com/Forums/sharepoint/en-US/4b21a168-443b-45d3-940c-fe52e8538290/how-to-protect-sharepoint-document-not-allow-to-download?forum=sharepointadminprevious
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Is there any difference between sun solaris 8 and windows for Garb.Collecti

Hi All,
is there any difference between refreshing the java virtual memory between sun solaris 8 and windows.i am fetching 25 records for every search action.in windows usage of java virual memory is 5 mb after every search it refreshes the memory.while using the same code in sun solaris 8 it throws heap out of memory error and for every search it wont refresh the memory.

Some other related links
http://java.sun.com/docs/hotspot/gc5.0/gc_tuning_5.html
http://e-docs.bea.com/wls/docs81/perform/JVMTuning.html

Difference between 2 timestamp,not considering the weekends (SATURDAY,SUN)

I use an Oracle XE and I have a table which has the following Timestamp columns
A_Date Timestamp
R_Date Timestamp
Now in this query i need to be able to exclude the SAT/SUN and show the difference between these 2 timestamp dates.
Could any one help on this?
I use this query to find out the difference between the 2 dates (R_DATE - A_DATE),showing the DAYS:HOURS:MIN:SECS
TRUNC (TO_NUMBER (SUBSTR ((R_DATE - A_DATE),
1,
INSTR (R_DATE - A_DATE, ' ')
|| ':'
|| SUBSTR ((R_DATE - A_DATE),
INSTR ((R_DATE - A_DATE), ' ') + 1,
2
|| ':'
|| SUBSTR ((R_DATE - A_DATE),
INSTR ((R_DATE - A_DATE), ' ') + 4,
2
|| ':'
|| SUBSTR ((R_DATE - A_DATE),
INSTR ((R_DATE - A_DATE), ' ') + 7,
2
) "TTR"
Example : A_DATE := '11-Dec-2009 19:33:30 PM' ---> Friday
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should not consider the SAT/SUN that comes between them.
Thanks
GAG

SQL> create table t as (
2 select to_timestamp('11-dec-2009 07:33:30 PM') rdate
3 ,      to_timestamp('14-dec-2009 07:32:38 AM') adate
4 from   dual
5 );
Table created.
SQL> select rdate
2 ,      adate
3         /* do some final formatting */
4 ,      to_number(substr(diff_incl_weekend, 1, instr( diff_incl_weekend, chr(32))))
5         ||':'||
6         substr(diff_incl_weekend, instr( diff_incl_weekend, chr(32))+1, 8) diff_incl_weekend
7 ,      to_number(substr(diff_excl_weekend, 1, instr( diff_excl_weekend, chr(32))))
8         ||':'||
9         substr(diff_incl_weekend, instr( diff_excl_weekend, chr(32))+1, 8) diff_excl_weekend
10 from ( /* substract intervals */
11         select to_char(rdate, 'dd-mon-yyyy hh:mi:ss AM') rdate
12         ,      to_char(adate, 'dd-mon-yyyy hh:mi:ss AM') adate
13         ,      trim('+'
14                from
15                numtodsinterval((to_date(to_char(adate, 'dd-mon-yyyy hh:mi:ss AM'), 'dd-mon-yyyy hh:mi:ss AM')
16                                 -
17                                 to_date(to_char(rdate, 'dd-mon-yyyy hh:mi:ss AM'), 'dd-mon-yyyy hh:mi:ss AM')
18                                )
19                               , 'day')
20                    ) diff_incl_weekend
21         ,      trim('+'
22                from
23                numtodsinterval((to_date(to_char(adate, 'dd-mon-yyyy hh:mi:ss AM'), 'dd-mon-yyyy hh:mi:ss AM')
24                                 -
25                                 to_date(to_char(rdate, 'dd-mon-yyyy hh:mi:ss AM'), 'dd-mon-yyyy hh:mi:ss AM')
26                                 -
27                                 nof_satsuns.total
28                                )
29                               , 'day')
30                    ) diff_excl_weekend
31         from   t
32         ,      /* calculate nof sats and suns*/
33              ( select count(dy) total
34                from ( select to_char(rdate+level-1, 'dy') dy
35                       from   t
36                       where to_char(rdate+level-1, 'dy', 'nls_date_language=american') in ('sat','sun')
37                       connect by level <= trunc(to_date(to_char(adate, 'dd-mon-yyyy hh:mi:ss AM'), 'dd-mon-yyyy hh:mi:ss AM'))
38                                           -
39                                           trunc(to_date(to_char(rdate, 'dd-mon-yyyy hh:mi:ss AM'), 'dd-mon-yyyy hh:mi:ss AM'))+1
40                     )
41              ) nof_satsuns
42      );
RDATE                   ADATE                   DIFF_INCL_WEEKEND                                 DIFF_EXCL_WEEKEND
11-dec-2009 07:33:30 PM 14-dec-2009 07:32:38 AM 2:11:59:08                                        0:11:59:08

Difference between Iplanet & sun

What is the difference between iPlanet directory Server and Sun Java Directory server?

iPlanet Dir Server was previously called Netscape Directory Server when it was version 4.X, I think it was renamed to iPlanet Dir Server since version 5.0.
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system IPLTadcon Administration Server Console
system IPLTadman Administration Server Documentation
system IPLTadmin Administration Server
system IPLTcons Console Client Base
system IPLTdscon Directory Server Console
system IPLTdsman Directory Server Documentation
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system IPLTdsu Directory Server (usr)
system IPLTjss Network Security Services for Java
system IPLTnls Nationalization Languages and Localization Support
system IPLTnspr Portable Runtime Interface
system IPLTnss Network Security Services
system IPLTpldap PerLDAP
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# pkginfo | egrep -i "SUNWds|SUNWas"
system SUNWast Automated Security Enhancement Tools
system SUNWasvc Sun Java(TM) System Server Console
system SUNWasvcp Sun Java(TM) System Administration Server Console Plugin
system SUNWasvmn Sun Java(TM) System Administration Server Man pages
system SUNWasvr Sun Java(TM) System Administration Server (Root)
system SUNWasvu Sun Java(TM) System Administration Server (Usr)
system SUNWdsvcp Sun Java(TM) System Directory Server Console Plugin
system SUNWdsvh Sun Java(TM) System Directory Server Heap Allocator
system SUNWdsvhx Sun Java(TM) System Directory Server Heap Allocator (64-bit)
system SUNWdsvmn Sun Java(TM) System Directory Server Man Pages
system SUNWdsvpl Sun Java(TM) System Directory Server PerLDAP modules
system SUNWdsvr Sun Java(TM) System Directory Server (Root)
system SUNWdsvu Sun Java(TM) System Directory Server (Usr)
system SUNWdsvx Sun Java(TM) System Directory Server (64-bit)
Gary

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Hi
Can some one let me on the difference between Sun JVM and IBM JVM
regs
Vivek Nidhi

Sun's JVM is built on HotSpot technology: http://java.sun.com/docs/hotspot
and covers a broad range of OS/HW combinations: http://java.sun.com/j2se/1.5.0/system-configurations.html
Maybe you can be more specific in your question or in describing what you want to do.
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hi *,
CAPS is based on ES komponents like appserver or JMS server.
CAPS is one product (one ide & environment) with many modules (connectivity , bpm .....)
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Differences between COM & JavaScript Scripting

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I can do it with a Web Service called in Javascript or in C# with COM.
Do you know the differences between COM and Javascript scripting ?
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Hello,
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What are the differences between Sun Certified Programmer for Java 2 Platfo

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What has been added to the new web component developer 5 exam?
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Difference between Two Date Should come into Text Item

Dear All,
i want to get difference between two date into text Item :P36_C in On Change java script.
i have two Date Item :P36_A and :P36_B .i have extract these date value from table then difference comes into Text Field :P36_C.
Now i want if i change Date into Item :P36_A or Item :P36_B then Defference between two date Should Come into Item :P36_C .
So i have use Java Script Code to do this
<script>
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Thanks

You can always create your own difference function based on your own criteria. You can modify this to suit your needs.
CREATE OR REPLACE FUNCTION CALC_OFFICE_DAYS(date1 DATE, date2 DATE)
RETURN NUMBER
IS
v_begin_date DATE := date1;
v_end_date DATE := date2;
v_office_start_time VARCHAR2(10) := '09:30 AM';
v_office_end_time VARCHAR2(10) := '06:30 PM';
v_comp_begin_time DATE;
v_comp_end_time DATE;
v_days PLS_INTEGER := 0;
v_hrs NUMBER := 0;
v_ttltm NUMBER;
BEGIN
select trunc(v_end_date) - trunc(v_begin_date)
into v_days
from dual;
select to_date(to_char(sysdate,'DD-MM-YYYY')||' '||to_char(v_begin_date,'HH24:MI'),'DD-MM-YYYY HH24:MI')
into v_comp_begin_time
from dual;
select to_date(to_char(sysdate,'DD-MM-YYYY')||' '||to_char(v_end_date,'HH24:MI'),'DD-MM-YYYY HH24:MI')
into v_comp_end_time
from dual;
select (v_comp_end_time - v_comp_begin_time)/24 into v_hrs from dual;
IF v_hrs > 4 then
v_ttltm := v_days + .5;
ELSE
v_ttltm := v_days;
END IF;
return v_ttltm;
END;
As has been noted, this question is best posted on the PL/SQL forum.

Difference between having "com.sun" prefix

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