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  • What will or won't cause a thread to block (a question from a test)

    - by fingerprint211b
    I've had a test, and there was a question I lost some points on, because I wasn't able to answer it : Which of the following is NOT a condition which can cause a thread to block : Calling an objects's wait() method Waiting for an I/O operation Calling sleep() Calling yield() Calling join() As far as I know, all of these are blocking calls : wait() returns when an something calls notify(), blocks until then If the thread is WAITING for an I/O operation then it's obviously blocked sleep(), obviously, blocks until the time runs out, or something wakes up the thread yield() "cancels the rest of the thread's timeslice" (lacking a better term), and returns only when the thread is active again join() blocks until the thread it's waiting for terminates. Am I missing something here?

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  • Is this method thread safe?

    - by user
    Are these methods getNewId() & fetchIdsInReserve() thread safe ? public final class IdManager { private static final int NO_OF_USERIDS_TO_KEEP_IN_RESERVE = 200; private static final AtomicInteger regstrdUserIdsCount_Cached = new AtomicInteger(100); private static int noOfUserIdsInReserveCurrently = 0; public static int getNewId(){ synchronized(IdManager.class){ if (noOfUserIdsInReserveCurrently <= 20) fetchIdsInReserve(); noOfUserIdsInReserveCurrently--; } return regstrdUserIdsCount_Cached.incrementAndGet(); } private static synchronized void fetchIdsInReserve(){ int reservedInDBTill = DBCountersReader.readCounterFromDB(....); // read column from DB if (noOfUserIdsInReserveCurrently + regstrdUserIdsCount_Cached.get() != reservedInDBTill) throw new Exception("Unreserved ids alloted by app before reserving from DB"); if (DBUpdater.incrementCounter(....)) //if write back to DB is successful noOfUserIdsInReserveCurrently += NO_OF_USERIDS_TO_KEEP_IN_RESERVE; } }

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  • How do i have a jar communicate with another jar

    - by ObviousComplexities
    Ok so i have 2 jars (Console, Core) 1st-Console) receives user input 2nd-Core) processes the input and gives an output i'm trying to have the two "Communicate" with each other by exchanging input and output now i have tried writing to a file to communicate when i ran into the problem of "Notifying" the other that there is input to receive and output to give i'm a bit new to this ideal so if its an easy function, please don't criticize.

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  • Create a public folder in internal storage

    - by user2516977
    sorry for my english, but i want to write in this forum because in my opinion is the best. Now my problem: I want to create a folder in Internal storage to share with 2 application. in my app, i download an Apk from my server and i run it. Before I used external storage and everything worked. Now i want to use the internal storage for users that don't have an external storage. I use this: String folderPath = getFilesDir() + "Dir" but when i try to run the apk, doesn't work. and i can't find this folder on my phone. Thank you..

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  • How can I communicate with an Object created in another JFrame?

    - by user3093422
    so my program basically consists of two frames. As I click a button on Frame1, Frame2 pops up, and when I click a button on Frame2, and Object is created and the window closes. Now, I need to be able to use the methods of Object in my Frame1, how can this be achieved? I am kind of new to Object-Oriented Programming, sorry, but it's hard to me to explain the situation. Thanks! I will try to put a random code for pure example below. JFrame 1: public class JFrame1 extends JFrame{ variables.. public JFrame1(){ GUIcomponents.... } public static void main(String[] args) { JFrame1 aplicacion = new JFrame1(); aplicacion.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } private class ActList implements ActionListener { public void actionPerformed(ActionEvent event) { new JFrame2(); } } } JFrame 2: public class JFrame2 extends JFrame{ variables.. public JFrame2(){ GUIcomponents.... } private class ActList implements ActionListener { public void actionPerformed(ActionEvent event) { Object object = new Object(); setVisible(false); } } } Sorry if it's messy, I made it in the moment. So yeah, basically I want to JFrame1 to be able to use the getters and settes from Object, which was created in JFrame2. What should I do? Once again, thanks!

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  • preview of Div Content

    - by Pranjali
    In my Code, one main div is there. main div's width and height is fixed. and I want to create the preview of the content of main div. what should I do to create preview of Div ?. I have minimized the height and width of main div but the content is not shrinking according to height and width of main div.

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  • Android search list, String

    - by NightSky
    Hey guys what is the best way to search through my list of objects, they return a few strings, last name and first name for example. Here how i'm currently searching but my search needs to match the entire string which I don't want. The search needs it to match part of the string like our contacts list on our phone and ignore the case. if (searchQ.equalsIgnoreCase(child.first_name)) { addChildToList(child); } Ive tried contains and starts with for example, they did not work. Whats going on? Thanks! Cheers!

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  • How to use Geocoder to get the current location zip code

    - by Noble6
    I am trying to get the zip code of the users current location.I have a teditText in MyActivity which should get populated based on the zip code I get from this activity. public class LocationActivity extends MyActivity { double LATITUDE; double LONGITUDE; Geocoder geocoder = new Geocoder(this, Locale.ENGLISH); { try { List<Address> addresses = geocoder.getFromLocation(LATITUDE, LONGITUDE, 1); if(addresses != null) { Address returnedZip = addresses.get(0); StringBuilder currentZip = new StringBuilder("Address:\n"); for(int i=0; i<returnedZip.getMaxAddressLineIndex(); i++) { strcurrentZip.append(returnedZip.getPostalCode()); } m_zip.setText(strcurrentZip.toString()); } else { m_zip.setText("No zip returned!"); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); m_zip.setText("zip not found!"); } } } I am not getting any response,the app logcat does not show any errors but the the editText field I want to populate remains blank.

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  • any other way to find char array length?

    - by user2785137
    public static int getLenth(char[] t) { int i=0; int count=0; try { while(t[i]!='\0') { ++count; i++; } return count; } catch(ArrayIndexOutOfBoundsException aiobe) { return count; } } This method returns length of charArray. But my question is, is there is some other "ways" to find the length of charArray without using this try, catch statements & all ?? Thanks in advance :)

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  • Can this loop take out 100% CPU?

    - by Nitesh Panchal
    Hello, I created a chat application and seems to work just fine except that it takes up 100% cpu. Can this loop take out 100% Cpu? If yes, then what do i do to overcome it? @Override public void run(){ try { _objServerSocket = new ServerSocket(17001, 500); while (true) { try { initializeConnection(); addNewChatClient(); Thread.sleep(1000); } catch (Exception ex) { } } } catch (IOException ex) { System.out.println(ex.getCause() + "\n"+ ex.getMessage() + "\n" + ex.getStackTrace()); } } Thanks in advance :)

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  • ?asting String to Time makes 01:00:00

    - by kawtousse
    Hi everyone, when i do the following: String start = request.getParameter("startp"); SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss"); long ms=0; try { ms = sdf.parse(start).getTime(); } catch (ParseException e1) { e1.printStackTrace(); } Time ts = new Time(ms); it is inserted with this value 01:00:00 witch is not the correct one (entered by user). I didn't undertstand the error here. Please help. Thanks

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