Writer.flush() : is it always needed?

Hi everybody,
This is just a general IO question. When I learned Java, I was taught that when you use a FileWriter or BufferedWriter, it's good practice to call writer.flush() after writing any line. Is this true, or is that a waste of time? I'm just curious.
Thanks,
Jezzica85

Hi everybody,
This is just a general IO question. When I learned
Java, I was taught that when you use a FileWriter or
BufferedWriter, it's good practice to call
writer.flush() after writing any line. Is this true,
or is that a waste of time? I'm just curious.
Thanks,
Jezzica85Flush will commit the data you have written to your disk. Sort of like close() but leaves the stream open.

Similar Messages

  • Unable to boot normally - Always need to boot with Single User Mode

    Hi Community,
    Since last few days, I am unable to boot my Macbook Pro normally, running latest version of OS X Yosemite. When I boot, it goes to grey screen with Apple logo and progress bar, once the progress completes to 100% (after 5-10 minutes which is very longer than usual), it asks me to 'Select  language' which seems like fresh installation of OS X. In that case, when I click next and it doesn't detect my SSD (blank list of select installation disk/drive).
    After reading some threads, I found work-around and always need to boot into Single user mode (by pressing Command+S during power on) and then need to run following commands...
    /sbin/fsck -fy
    /sbin/mount -uw /
    "device is write protected" numerous times
    reboot
    and then only it loads OS X and displays login screen. This happens all the times and I need to follow above steps always to get login screen.
    How can I fix this?

    Please help me out here. I tried booting it off a USB flash drive with ATV flash but that gave me some errors and prompted me to login with username [email protected] with password frontrow
    But I am not sure how to get to login using a suitable input. I tried to telnet it using my PC over network but I dont think it has initialized anything (like wifi or network) at the prompt. Would it take USB keyboard input? All I can do is remove the power and restart it with the usb flash out and get into then get into the recovery loop. I am not sure replacing the hard-drive would help. Any help would be greatly appreciated.
    Thanks
    Sinu

  • In AIR 3.x, a socket write()+flush() on a client will hang app if peer adverts TCP ZERO WINDOW

    In AIR 3.x, a socket write() + flush() on a client will hang (and freeze the entire app) if the socket peer advertises a ZERO TCP Window, i.e. no space available in peer receiver's socket buffer.
    AIR on Windows insists that the developer flush() the socket in order to write (any data at all).  When the peer (receiver) advertises a 0 byte tcp window, the client flush() call can sometimes take 10 seconds (i.e. 10000 milliseconds), whereas normally it should take 10 to 50 milliseconds.
    Additionally, AIR stayed in hung position.  Since the socket had TCP KEEPALIVE option enabled (at the server), the socket stayed open.  I let it stay hung overnight.  The next day when I rebooted the server, the socket got closed and finally the AIR program "RETURNED FROM the sock.flush()" call.  A timestamp before and after the call to flush() showed that the flush() call was in hung state for 56472475 milliseconds, i.e. 15.7 hours!  After it returned from the flush() call the AIR app was responsive and seemed to work properly.  Thus proving that it was indeed stuck (or blocked) on the flush() call for 15 hours trying to drain the data to a socket with zero tcp window condition.
    A tcp zero window condition on 1 socket hanging an entire app sounds concerning.
    Solution Suggestions:
    (1) What is needed is for the OutputProgress event to include a field for 'bytes that can be written safely without blocking on the socket', i.e. 'space available in underlying platform socket buffer' which would account for the socket send buffer size.
    (2) An alternative solution would be for AIR to provide a write-timeout setsockopt (or a writeTimeout() method on the socket), and return flush with an error (or EWOULDBLOCK), and call the OUTPUTPROG event only when there is enough space available.
    If there are any other workarounds, please let me know.
    Thank you.

    Question:  Does Adobe AIR expose the getsockopt() and setsockopt() calls on a socket?  It would be useful to apps to tune the io buffer sizes.
    Additional Details:
    RTT = 100+ milliseconds
    TCP Window Scaling enabled
    Secure Socket
    Hard to reproduce with plain TCP socket, but occurs without fail with SecureSocket.  Not knowing the underlying code base, am wondering if it is because the SSL encryption overhead (bytes) throws off the buffer available size compution in secure_sock.flush() .
    Thanks.

  • Does an external hard drive ALWAYS need to be connected to my mbp with retina display for Time Machine?

    Does an external hard drive ALWAYS need to be connected to my mbp (OS 10.10.1) with retina display for Time Machine? Or can it be connected once a week or whenever I want? I used to have an external drive always connected to my previous mbp, but it made moving my mbp around a bit of a hassle with it connected...

    When the backup drive is not connected, some of the free space on the internal drive will be used to make local snapshots, which are backup copies of recently deleted files. Local snapshots will protect you from unintended file deletions, but not from a drive failure. You should only go as long between backups as you're willing to lose data. If losing a week's worth of work is acceptable to you, then that backup frequency is OK. Otherwise, it isn't.

  • AVCHD clip's always needs to get rendered when inserting. Media info about .mts file attached

    Hi
    I have previously discussed this problem in another thread. I have .mts files that I insert in a project (project preset set to PAL-AVCHD Full-HD)....when inserting i always need to render the clips and as many peole have mentioned, this should not be needed, instead PrEl should take care of this by itself..and it really sunds weird if it doesnt...
    So, why is this happen...i get so frustrated when I have to re-render the clips all the time, since also - it takes a looong time for jsut tiny tiny clips ? I posted the hardware specs I have two days ago in this same forum, and it looks from the answers I got that this hardware should be enough for not having to wait several minutes to jsut add a 6 second AVCHD clip ?
    Please look at below image that is a screenshot from MediaInfo about the details for my .mts file I'm trying to add - resulting in new rendering needed, plus the fact that it takes about 5 minutes to render it ??
    Please, suggestion or solutions ? I'm lost...I got feedback yesterday that this is a known problem with both PrEl 8 and PrEl 9 ..that AVCHD clips needs to get rendered manually when they are added....i.e a known bug in these versions ?? Any experience ? How can I move forward, I have problems to understand that such bug should exist without anysolution and/or workaround since I see this as a feature that MUST work for people not getting crazy :-)
    MediaInfo screenshot (click on image to get it to look better) BR /Helmut

    Hi Neale
    many thanks for your time trying to help me out.....
    Please see my answers below in bold, hope you and/or someone else can help me with some further answers
    Are you opening a project created in PRE8 with PRE9? If yes, that is the most likely cause of the problem. Create a new PRE9 project and see if the same problems after you import the clip and save the project. No, I'm only working in Pr 8.0 - I have this problem as soon as I add a clip..not that into the different formats, just know that the best possible output from my camera (Canon HF10) should be AVCHD..thats why I added teh detailed info from "MediaInfo". can you tell from that info I'm correct, i.e that the .mts file is really AVCHD as expected ? Just to help me confirm that. So, I havent been using PrEl 9.0...another person two days ago told me that PrEl 9 also got similar problems as I reported for my PrEl 8.0 ?
    When you first added the clip to your project did you receive any messages that the file was not suitable for the format? If so did you accept the offered preset? If you didn't start a new PRE9 project and this time accept the offer. No, I did not get any messages as all about the format. Occasionally I get something like "Do you want to fix the quality in the clip" ..cant recall exactelly what the message is, but its for sure nothing about the format
    When you put it into the project, did you have a red line running the length of the timeline? If you do then your preset is not correct (this is purely PRE9. PRE8 always required rendering AVCHD footage).Yes, always when I add a clip I get this red line. If I understand everything correctly this means I have to hit ENTER key to create a preview file....thats my second problem - as soon as I do that, it renders the clip very very slowly although I should have prety good hardware (According to spec posted two days ago).
    So, as a summary. Do you think that buying Premiere Elements 9.0 should get rid of this problem when adding AVCHD ? If that is the case, I feel I just want to be sure about this and that I will not experience the problem again. Can it not just be some setting that is, by default, not correct in Premiere El 8.0 that is causing this or is this really a known bug without fixes available from Adobe?
    Best Regards
    Helmut

  • Iphone 5-updated to ios 7.0.2 keeps freezing in lock screen.I always need to restart or should wait till a phone call come to unlock the screen. Does any body have the same issue??

    Iphone 5-updated to ios 7.0.2 keeps freezing in lock screen.I always need to restart or should wait till a phone call come to unlock the screen. Does any body have the same issue??

    I do have the same issue with my 4s after updating.tried with restoring several times,but the problem still persists.....

  • My zen neeon 5gb always needs to be formatted everytime i connect

    i have a zen neeon 5Gb with no travel charger ( not bundled)
    so i usually charge it with my pc's usb, but my neeon always like corrupted everytime i need to re-charge
    the "corrupted" status is like i can't access it from windows explorer, and my windows hangs everytime i connect my neeon
    so what i did is always put the neeon into recovery mode and format the firmware again,then the problem's solved
    but i always need to did this almost everytime i connected it to my pc, which makes i need to copy all my mp3s again
    and again everytime i want to charge it...
    this is very tiring..helps please...

    Welcome to the Apple Community.
    Intermittent problems are often a result of interference. Interference can be caused by other networks in the neighbourhood or from household electrical items.
    You can download and install iStumbler (NetStumbler for windows users) to help you see which channels are used by neighbouring networks so that you can avoid them, but iStumbler will not see household items.
    Refer to your router manual for instructions on changing your wifi channel or adjusting your multicast rate.
    There are other types of problems that can affect networks, but this is by far the most common, hence worth mentioning first. Networks that have inherent issues can be seen to work differently with different versions of the same software. You might also try moving the Apple TV away from other electrical equipment.

  • When I try to upgrade and install to iOS 5.1, error message prompt "operation stop running". I have tried several time but failed. Also, would like to know why always need to have wifi access in order to upgrade the version of iPad iOS, why not 3G ?

    When I try to upgrade and install to iOS 5.1, error message prompt "operation stop running". I have tried several time but failed. Also, would like to know why always need to have wifi access in order to upgrade the version of iPad iOS, what is the purpose of 3G then? This is really nonsense using wifi + 3G iPad. need help ! Thanks.

    The file is too large to download via 3G. There is a 20MB limit with 3G. The purpose of having 3G is that you have internet access everywhere and do not need to be near a WiFi hotspot or network.
    Not every single thing that you do every single minute of the day on the iPad involves downloading files larger than 20MB. You can surf the internet all day long sitting out in a park somewhere with 3G - but not with a WiFi only iPad - unless you use a hotspot with it.
    Try turning off your firewall and anti virus software while you try to download the iOS update.

  • Every time I open iPhoto, the program freezes, showing me the spinning rainbow of death.  I always need to perform a Force Quit.  I have updated my software, but that did not help.

    Every time I open iPhoto, the program freezes, showing me the spinning rainbow of death.  I always need to perform a Force Quit.  I have updated my software, but that did not help.

    tullch24
    Try these in order - from best option on down...
    1. Do you have an up-to-date back up? If so, try copy the library6.iphoto file from the back up to the iPhoto Library (Right Click -> Show Package Contents) allowing it to overwrite the damaged file.
    2. Download <a href="http://www.fatcatsoftware.com/iplm/"><b><u>iPhoto Library Manager</b></u></a> and use its rebuild function. This will create a new library based on data in the albumdata.xml file. Not everything will be brought over - no slideshows, books or calendars, for instance - but it should get all your albums and keywords back.
    Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one.
    3. If neither of these work then you'll need to create and populate a new library.
    To create and populate a new *iPhoto 08* library:
    Note this will give you a working library with the same Events and pictures as before, however, you will lose your albums, keywords, modified versions, books, calendars etc.
    In the iPhoto Preferences -> Events Uncheck the box at 'Imported Items from the Finder'
    Move the iPhoto Library to the desktop
    Launch iPhoto. It will ask if you wish to create a new Library. Say Yes.
    Go into the iPhoto Library (Right Click -> Show Package Contents) on your desktop and find the Originals folder. From the Originals folder drag the individual Event Folders to the iPhoto Window and it will recreate them in the new library.
    When you're sure all is well you can delete the iPhoto Library on your desktop.
    In the future, in addition to your usual back up routine, you might like to make a copy of the library6.iPhoto file whenever you have made changes to the library as protection against database corruption. 

  • Always need Disconnect power, press the power button wait for 10 seconds...

    I bought a HP computer for a couple of years ( Pavilion a6695it  ) It always works well. But in recent days, I can not start up it. I tried pressed power button on the front of the computer, nothing happend. Then I searched in hp site. finnally, I find this article http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00241069&tmp_task=solveCategory&cc=it&dlc=it&lc...
    In english version the article is here: 
    http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph06788&cc=us&destPage=document&lc=en&product=3...
    Power supply light is on or flashes
    Perform the following steps, in order, until power is restored or it is determined that there is a hardware failure:
    CAUTION:This product contains components that are easily damaged by ElectroStatic Discharge (ESD). To reduce the chance of ESD damage, work over a non-carpeted floor, use a static dissipative work surface (like a conductive foam pad), and wear an ESD wrist strap that is connected to a grounded surface, like the metal frame of a PC.
    Disconnect everything from the computer, including the power cord.
    With the power cord disconnected , press the power button on the front of the computer and wait for ten seconds.
    This is work for me. But now, my computer always need this methond that it can be started up.
    Disconnect power -> press the power button and wait for ten seconds -> then the system will  start up
    So my question: where is the problem? Which part is broken and i should replace? Thanks.
    regards,
    Youli
    This question was solved.
    View Solution.

    Hello youlichika,
    Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
    I understand that you are not able to power on your desktop, and I would be happy to assist you in this endeavor! 
    In following the document for Troubleshooting Power Supply Issues, were you able to follow steps 3-9? If so, what were the results?
    If you have come to the end of the document, and you still have to drain the power from the computer to power it on, you can find a replacement part (5188-2627) through one of the sites available by following this link.
    I hope this helps!
    Best Regards   
    MechPilot
    I work on behalf of HP
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

  • Do I always need -cp / CLASSPATH to start my program ?

    Hello
    Do I always need to set CLASSPATH or use -cp in order to launch a Java application ? I mean do I always need to know what the application installation directory is in order to start it ?
    Is there no way to launch the application with just the class name, like with `java net.grinder.Grinder´ in a way does not require me to know where the application binary files are ?
    Is there no kind of local registry or repository of installed Java classes, that the launcher (`java´) could use ?
    Thank you,
    Timothy Madden
    Edited by: user11082954 on Dec 12, 2011 7:49 AM

    Yes, you need to specify the classpath, since that is where the JRE will look for classes which are supposed to be loaded.

  • Cinematized QT's always need rendering... why?

    I experimented with every video output option Cinematize has and even the lowest resolution QT file with no audio requires rendering in my timeline. I have FCP 6, so it asks if I want to switch the timeline to match the clip, but still RED LINE. I've tried every easy setup! and i've customized my sequence settings to my clips... so WHY?!
    Here are my clip settings: 29.92, 640x480, DV/DVCPRO - NTSC, pixel aspect = square. Is it the frame size? is it my powerbook? I have an HDV project that processes HDV footage fine... but not this!
    I already trashed my preferences and fiddled with the sequence playback...
    any help is much appreciated. Thank you
    -A-

    Cinematized QT's always need rendering... why?
    Because your clips are not matching your FCP Sequence settings. If your Sequence settings are DV NTSC, then you need 720x480 (rectangular pixels) with the audio being AIFF, 48khz, 16 bit.
    -DH

  • Always need to render audio on clip import

    Hi,
    I use Streamclip or to convert my AVI files (from a digital camera) to DV so I don't have to render immediately on import. All works ok with the video, but I always need to render audio on import. Does anyone have any suggestions as to what settings to use on Streamclip and / or FCE?
    Thanks,
    g

    Do not convert to DV. Convert to QuickTime using the DV codec. The export to DV setting in Streamclip is for DV Stream and is used only by iMovie.

  • HT5622 Do you always need a credit card to verify your account

    Do you always need a credit card to verify your account

    You can set your account to have no bank card.
    This user, mountaingoatgirl, explains how to get a None option in your account details in the iTunes app on a Mac or PC. -
    https://discussions.apple.com/message/24907941

  • Cannot purchase,always need verify payment info

    cannot purchase, always need verify payment info, but my this card last time buy many thing already, why now got this problem?

    Launch iTunes, click on iTunes Store, and click on your Apple ID in the upper right. Log in and enter your payment information.

Maybe you are looking for

  • Attachments/Pictures not loading in messages (details section) post iOS 8.0.2

    I have an iPhone 5 - after downloading 8.0.1 I discovered the new "Details" section of messages that showed all of your pictures/videos in a message thread as "Attachments", grouped in a grid style. However, after my update to 8.0.2 some of the attac

  • New include proram -user exit- sales order

    hi i have to create a new screen which has to be displayed as a pop up from the user exit "<u>userexit_save_document_prepare"</u> which is present in MV45AFZZ the processing logic for the screen should be written in include program which is to be inc

  • How do I get Bongos on Garageband

    How do I get Bongos on Garageband. I assume they are in Logic, but for now, that is WAY OVER my head. Any Programs to buy ?

  • Where can I get rid of an old Power Mac G3 Beige?

    Where is the best place to get rid of an old Power Mac G3 Beige? Are there sites out there where Mac enthusiasts would buy it or its part? It has no hard drive. Also have the Multiple Scan 720 Display Monitor.

  • Rounding wilst using Pop-up Menu's

    Hi, Is there a way to stop numbers rounding the numbers imputed by a Pop-up menu ? Thanks sampether