Why only one public class in one file

why does java allows only one public class in one file?
Why can not we have two or more public classes in file?
Thank u.

Note, you can have multiple inner classes.
e.g.
public class A {
    public static class B {   }
    public class C {   }
    private class D {   }
}

Similar Messages

Why only 1 public class in java file

In any java file, why do we have only one public class whose name is same as the java file name?

Jasmit1986 wrote:
Thanx for the link db. But in the link it is explained why we have the name of the java file same as the class name.
My doubt is that why can't we have more than one public class in a java fileTo keep things simple and less confusing. There's really no good reason to have multiple public classes in one file, so this just enforces the "best practices" idea.

ITunes mp3s showing up at duplicates w/only one file in folder

I recently recovered a slew of my mp3s from an external hard drive. I re-added them from several locations, creating duplicates. The problem I'm having is that in many (as in most) cases, there is only one file in the folder but it's showing up twice in iTunes and deleted either in iTunes will delete the (only) file from the folder.
I'd experimented with deleting, selecting "keep file" then re-adding the folder but then I lose all my ratings, which I've spend a LOT of time creating.
A) Is there any way to simply delete all the "ghost" files (single files that show up twice in iTunes) without losing the ratings?
B) There are also legitimate duplicate files. When I do "show duplicates" it's a shallow feature that only goes by track name (while many different tracks have the same name (live versions, different albums, etc.). Is there a simpler way to find and delete all of these duplicates?
Thanks in advance for any help. - Brian

Dupin may be helpful (it's not free, though).

Why only one client ???

Why only one client is possible for one server in case of BW ?? And why it is not the case in R/3???

Hi,
have a look at sap help:
Clients in BW:
http://help.sap.com/saphelp_nw04/helpdata/en/b7/8a9a3aaf894871e10000000a114084/content.htm
Assign points if its helpful.

Why only one public class in a source file?

why we have to write only one public class in a source file?

PhHein wrote:
Because the JLS says so.It does?
From section 7.6 of the JLS (third edition):
When packages are stored in a file system (§7.2.1), the host system may choose to enforce the restriction that it is a compile-time error if a type is not found in a file under a name composed of the type name plus an extension (such as .java or .jav) if either of the following is true:* The type is referred to by code in other compilation units of the package in which the type is declared.
* The type is declared public (and therefore is potentially accessible from code in other packages).
This restriction implies that there must be at most one such type per compilation unit. This restriction makes it easy for a compiler for the Java programming language or an implementation of the Java virtual machine to find a named class within a package; for example, the source code for a public type wet.sprocket.Toad would be found in a file Toad.java in the directory wet/sprocket, and the corresponding object code would be found in the file Toad.class in the same directory.
>
To my mind, it's strongly recommending, rather than mandating, this practice. All academic of course, merely shifting the answer from "Because the JLS says so" to "Because pretty much all Java compilers say so". I don't know of any that don't enforce this, but of course, that doesn't mean they don't exist

Why a public class name and file name same?

All of us know that, a public class should be declared in a file which has the same name of that class. What is the underlying concept behind this..Can someone give a clear explanation?
Thanx..
Sandeep Joseph
Paragon Solutions
[email protected]

Another issue, it was said that the file must be named
after the class to find the class's code when
compiling dependent classes. Doesn't this apply to
non-public classes too (with the dependent class being
located in the same package)?This applies to all top-level classes ...
You can define multiple classes in one file though:
class A {
class B {
}It's perfectly valid to have both classes defined in the same file (named A.java if A is the first class to be defined in that file).
You will get a compiler warning as soon as you reference a non-top-level class from a class that is defined in another file, though.

PI 7.11 how to pick up only one file at a time in file adapter

Hi
Is there a smart way of only picking up one file at a time (for every poll) in a sender file adapter?
E.g. There are 100 files in the source folder but I only want to pick up 1 of the files every time I poll the source folder in my sender file adapter.
BR
Mikael

Thanks
I did something like this:
FOR /F %%I IN ('DIR
srv145.??????????\reload\files\*.* /B /O:-D') DO (
echo %%I
move
srv145.????????????\reload\files\%%I
srv145.??????????\DMI\out\nocontentconversion
exit /B 0

Why only one channel of sound in sequences? Please someone try this quest

When I add a sequence to a sequence, I have only one channel of sound but, when I open that sequence I have 2 channels of sound.
Is it a sequence setting and if it is I see:
outputs 2
downmix 0
grouping: Stereo selected
Dual mono not selected.
I swith these around a bit but get no change.
My raw footage say "2 Mono" from my Sony DSR PD-150 at 16 bit, 48 khz.
I usuall use one channel for camera sound and 2nd channel for mic.

the number of audio channels that your nested sequence will contain is the same as the number of audio outputs you have selected for that sequence ...
for example, if you create a sequence with 10 tracks of audio, but have only set the sequence to have 2 audio outputs, then when you nest that sequence the nest will have only 2 tracks of audio ... change the audio outputs to 4, or 6, or 8, or 10 etc regardless of how many tracks you actually use, and the sequence, when nested, will have the same number of audio tracks as the sequence has audio outputs
... ok, so that explains the relationship between audio outputs and the number of tracks of audio that a nested sequence contains
so why are you getting only one channel of sound when you edit it in to another sequence? my guess is that you are only patching 1 channel ... load the source sequence into the viewer (drag and drop), now check in the patch bay area at the left of the timeline window to make sure that your a1 to A1 and a2 to A2 connections are not broken ... and edit it in.
cheers
Andy

Why only one voting disk showing while vote diskgroup has three disks?

Hi, experts,
OUr diskgroup OCR_VOTE did have three disks, see below:
SQL> select group_number, name, path from v$asm_disk;
GROUP_NUMBER NAME PATH
2 ASMDISK01 ORCL:ASMDISK01
2 ASMDISK02 ORCL:ASMDISK02
2 ASMDISK03 ORCL:ASMDISK03
2 ASMDISK04 ORCL:ASMDISK04
2 ASMDISK05 ORCL:ASMDISK05
2 ASMDISK06 ORCL:ASMDISK06
3 ASMDISK07 ORCL:ASMDISK07
3 ASMDISK08 ORCL:ASMDISK08
3 ASMDISK09 ORCL:ASMDISK09
1 OCR_VOTE01 ORCL:OCR_VOTE01
1 OCR_VOTE02 ORCL:OCR_VOTE02
1 OCR_VOTE03 ORCL:OCR_VOTE03
However only one votedisk exsited:
+ASM1$ crsctl query css votedisk
## STATE File Universal Id File Name Disk group
1. ONLINE 4722e13b38c14fa0bfcce2db1dcb7b84 (ORCL:OCR_VOTE01) [OCR_VOTE]
Located 1 voting disk(s).
How do I have three votedisks?
Thanks in advance.

Thank you for response.
I checked asmcmd, and under voting diskgroup, there are two folders:
Y ASMPARAMETERFILE/
Y OCRFILE/
ASMCMD> cd ASMPARAMETERFILE/
ASMPARAMETERFILE UNPROT COARSE FEB 14 2012 Y REGISTRY.253.775250583
ASMCMD> cd ocrfile
OCRFILE UNPROT COARSE NOV 28 01:00:00 Y REGISTRY.255.775250583
our DB spfile per show parameter spfile , it shows it stored at DAT diskgroup instead of vote diskgroup.
So my questions here are:
1). since spfile in database shows:
SQL> show parameter spfile
spfile string +DAT/prd/spfileprd.ora
The spfile under vote diskgroup must be for ASM instance. How do I move that? seems have to bounce asm to move it somewhere else. that will cause some disturbance to the services.
2). is that under OCR_file, the ocr file including voting disks?
Since OCR files are mirrored like this:
ocrcheck
Status of Oracle Cluster Registry is as follows :
ID : 546691893
Device/File Name : +OCR_VOTE
Device/File integrity check succeeded
Device/File Name : +FRA
Device/File integrity check succeeded
Is that means I can delete the one at vote disk and the one on FRA should still serve the purpose?
Thanks again.

Why only one backup being made?

I just noticed that there is only one backup listed in iTunes. Is it intended to only preserve the most recent?
If so, did the developers completely miss the possibility of "I didn't notice I lost that data until after the daily backup sync, now it's irretrievable"
What's the story here?

That a good idea in theory, but not know all the details of how the backup works, I would be a little relucant. For instance, iTunes knows you last backup was Tuesday @ 1730. You replace the backed up copy from Tuesday with one from Monday. Now iTunes does not see the last (and only) backup that it was aware of, but instead sees a different backup. iTunes may see this as some sort of corruption.
I strongly suspect that iTunes makes a notation in one of the iTunes library files when the last backup was made. If this information differs from the backed up files, iTunes would view the backup as being corrupt.
I would just be a little reluctant to try this, given that you may lose a lot of data and settings.
Message was edited by: GregF-ATL

Why only one recent backup to restore from?

I backup up my iPhone every day. In iTunes>Preferences>Devices, why do I only see today's backup and a backup from three months ago?

Only one backup is kept by itunes(this backup is overwritten each time you sync), except for restore backups, which are not overwritten & are kept by time & date stamp. The reason you don't see any other backups listed is because you most likely have never restored your phone. If you performed a sync before you restored from backup, your backup was overwritten & that's why your info was not replaced.
If you backup your computer, you can extract your backup from that computer backup, replace the one on your computer with this & restore from that backup. DO NOT SYNC before restoring from this backup. You will be given the option to create a backup before you restore, decline.

LSMW RFBIBL00 using only one file

Hello everyone,
I am creating an LSMW for post documents. My input file is so far given by an legacy system.
I have one file, which contains the accounting transactions.
One accounting transaction is distributed over more than one line in my input file. So you have one debtor account and many contra-entries.
My problem is, that every line has header data (debtor and contra-entry), so I have no idea how to tell my LSMW that there has to be a new line item instead of a new document.
I hope anybody can help
Best regards
Patrick

Hi Patrick,
In LSMW RFBIBL00, where you want to upload transaction data, you generally have two files.. One for header data and the other for Line item data.
In the Header Data, there is a field called link, say for example it is (1) and it will have other data like Date, Posting key, Currency etc.. (BKPF data)
In the Line item file, also the field Link will have (1) and in fact this link will dictate when a new document is to be posted.. say for example this particular document has 5 line items to be posted. Then all the line items will have the same link (1)
and the debit and credits should match to Zero. When this matched a document is posted..Then again the second line in header file will have link (2) and again the line item file will have multiple line items all having link (2) so the second document will get posted.
In short, system will pick up the link No. from the header file and look for all line items in line item file and match the debits and credit to Zero to post a document, the moment it finds a new Link No., it will post a new Document No.
Regards,
SAPFICO

Why only one leading ledger?

Hi
I am aware that in new GL you can have only one leading ledger. you can have as many non leading ledgers. Only leading ledger values flows to CO.
what can be the possible reasons for the restriction of "only one leading ledger"???
thank you in advance
Regards
Vedavatee

Dear expert
    In New G/L, there is one leading ledger for each client that is valid for all company codes
    You can define only one ledger as the leading ledger u2013 SAP provides the leading ledger u201C0Lu201D
    The leading ledger is integrated with all subsidiary ledgers
    Only the values from the leading ledger are sent to CO
    The leading area in Asset Accounting (depreciation area 01) must be posted to the leading ledger
    Leading ledger uses the (additional) local currencies assigned to the company code
    Leading ledger uses the GL Total Table: FAGLFLEXT
In each company code, the settings made for the following parameters are automatically applied to the leading ledger:
    Currencies
    Fiscal Year Variant
    Posting Period Variant
Regards
Ajeesh.s

Why is one file so large?

Hey,
Something has been going on...
it's driving me crazy cause I can't figure it out,
so hopefully someone out there can help solve it.
I shot a video of a local event using three cameras. There were
two shows that I video taped, both were exactly the same in content,
except there were different people in each show.
So I have two sequences (one from the 10AM show & one from the 2PM show)
exactly the same length in time,
yet when I export them using QT (as a Ref movie: DV NTSC 48 kHz)
one of the files ends up being almost twice the size as the other.
(6.2 gigs & 3.44 gigs)
Why would this be?
Shouldn't they be the same size?
Or at least a lot closer in size?
I am exporting them both with the exact same settings.
I can't really see a difference in the quality when I watch the videos play back in QT player, but if the file is nearly double in size,
then there has to be a difference in it's quality even though I can't see it on my monitor.
Could someone please help me solve the mystery of double file size?
Thanx,
Todd

why should I render, then delete my reders and then re-render?
You mis-understood. In Sequence>Render All>Both, only the RT situations listed that have a check mark next to them will be rendered. If they are not Checked off, they will not be rendered. What I was asking you to do is to verify all the conditions have a check mark in front of them. Once you have deleted the renders, then render again.
An audio mixdown is useful if you have a lot of audio tracks. It reduces the multiple tracks into your stereo grouped output (assuming that is what you've set up for your audio output). Sequence>Render Only>Mixdown (CommandOptionR)
Cheers,
x

Why only one appender works

I use jboss cluster, and I want separate server.log and cluster.log.
treat file and console appender as root.
before I add cluster appender, every thing works fine. but after I add cluster appender, only cluster.log work, server.log is empty.
are someone can help me out.
Thank you very much
source log4j.xml is in the following:
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="true">

<appender name="CLUSTER" class="org.jboss.logging.appender.RollingFileAppender">

<param name="File" value="${jboss.server.home.dir}/log/cluster.log"/>
<param name="Append" value="true"/>
<param name="MaxFileSize" value="500KB"/>
<param name="MaxBackupIndex" value="10"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p [%c] %m%n"/>
</layout>
</appender>
<appender name="FILE" class="org.jboss.logging.appender.RollingFileAppender">

<param name="File" value="${jboss.server.home.dir}/log/server.log"/>
<param name="Append" value="true"/>
<param name="MaxFileSize" value="500KB"/>
<param name="MaxBackupIndex" value="10"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p [%c] %m%n"/>
</layout>
</appender>
<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">

<param name="Target" value="System.out"/>
<param name="Threshold" value="ERROR"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c{1}] %m%n"/>
</layout>
</appender>
<root>
<appender-ref ref="CONSOLE"/>
<appender-ref ref="FILE"/>
</root>

<category name="org.jboss">
<priority value="DEBUG"/>
<appender-ref ref="FILE" />
</category>
<category name="org.jgroups">
<priority value="DEBUG"/>
<appender-ref ref="FILE" />
</category>
<category name="org.apache">
<priority value="INFO"/>
</category>
<category name="org.jgroups">
<priority value="DEBUG" />
<appender-ref ref="CLUSTER"/>
</category>
<category name="org.jgroups.protocols.UDP">
<priority value="DEBUG" />
<appender-ref ref="CLUSTER"/>
</category>
<category name="org.jboss.ha">
<priority value="DEBUG" />
<appender-ref ref="CLUSTER"/>
</category>
</log4j:configuration>

Hello, you might get better answer in either J2EE forums, or in JBoss.org forums.
When cross posting, it is polite to include a link to the orginal thread (this one).

Why only one public class in one file

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