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  • What is the answer to this homework about maps and collections? [closed]

    - by Bishan
    Maps collection is referred to an dictionary because of the way it works. Each entry into a maps collection involves a pair of objects. In a maps collection, an object associates the key which determines where the object is stored in the map. The key object in the maps collection can be duplicated. A stack which has Last In First Out storage mechanism can be considered as a maps collection. I think #1,#2,#3 and #5 are Correct in above, but I have doubt with #5. Am I correct?

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  • is it possible to get the class of the interface <Set>

    - by user1164885
    Am having some arguments say (String a, Treeset b, Set c) and i try to get the class by arguments[i].getClass(); of the above arguments.. is it possible to get the class of the interface . ex., Class[] argumentTypes = new Class [arguments.length]; for (int i = 0 ; i < arguments.length ; i++) { argumentTypes[i] = arguments[i].getClass(); }

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  • How do I create new variables based on the size of a List?

    - by GK
    I have a List with say size n, and i have to dynamically create n variables ie i want to dynamically create the variables depending upon the size of the list. How can i achieve this? Say i have List as List year with n elements in it; then i have to create the n Integer variables from the above list. thanks.

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  • Enumerate all k-partitions of 1d array with N elements?

    - by user301217
    This seems like a simple request, but google is not my friend because "partition" scores a bunch of hits in database and filesystem space. I need to enumerate all partitions of an array of N values (N is constant) into k sub-arrays. The sub-arrays are just that - a starting index and ending index. The overall order of the original array will be preserved. For example, with N=4 and k=2: [ | a b c d ] (0, 4) [ a | b c d ] (1, 3) [ a b | c d ] (2, 2) [ a b c | d ] (3, 1) [ a b c d | ] (4, 0) I'm pretty sure this isn't an original problem (and no, it's not homework), but I'd like to do it for every k <= N, and it'd be great if the later passes (as k grows) took advantage of earlier results. If you've got a link, please share.

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  • Searching major search engines with text such as <%#

    - by Daniel Dyson
    If I type '<%# vs <%"' into any of the major search engines, everything is stripped out except the 'vs'. I understand why they do this. I would just like to know if anyone knows of a way to escape illegal characters so that they are searched properly. I know this is not strictly a programming question, but it is relevant.

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  • JSTL request attribute in c:if

    - by JNPW
    I set an request attribute in my action class as follows: request.setAttribute("xFg",Boolean.TRUE); I want to retrive this in my JSP. I want to retrive them using JSTL tags. I tried this : <c:if test="${requestScope.xFg}"> <c:set var="showlist" value="true" /> </c:if> But c:if didnt work, i mean it didnt goto c:set I tried to print the sameusing c:out but nothing got displayed. What is wrong or How should i test request attribute value. I havent used requestScope so far. Is requestScope the option to get the request value? pls help.Thanks in advance.

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  • Calendar add() vs roll() when do we use it?

    - by Pentium10
    I know add() adds the specified (signed) amount of time to the given time field, based on the calendar's rules. And roll() adds the specified (signed) single unit of time on the given time field without changing larger fields. I can't think of an everyday usage of roll() I would do everything by add(). Can you help me out with examples when do we use roll() and when add()?

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  • Regarding Notify()

    - by user1334074
    I was going through threads and I read that ..The notify() method is used to send a signal to one and only one of the threads that are waiting in that same object's waiting pool. The method notifyAll() works in the same way as notify(), only it sends the signal to all of the threads waiting on the object.... Now my query is that if Lets say I have 5 threads and one main thread , so initially the main thread starts and then five other threads start , Now I want to send notification to third thread only , How could it be possible with the use of notify(), since here I am sending notification to third thread only , please advise.

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  • Check if user in a database is banned JDBC

    - by user2297666
    Using an oracle database, I need to perform a check to see if a user in my 'users' table is banned or not. The user is banned if his column 'banned' has a value of '1', '0' if he is not. I have the following working code here: public boolean banUser(String username) {//TODO check if user is banned already try { pstmnt = conn.prepareStatement("UPDATE users SET banned = 1 WHERE username = ?"); pstmnt.setString(1, username); pstmnt.execute(); logger.info("Banned User : " + username); return true; } catch ( SQLException e ) { e.getMessage(); } return false; } I'm not sure how to perform an if statement on top of a prepared statement. Any ideas?

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  • Do these methods have same output?

    - by devrimbaris
    protected synchronized boolean isTimeoutOccured(Duration timeoutDuration) { DateTime now = new DateTime(); if (timeoutOccured == false) { if (new Duration(requestTime.getMillis(), now.getMillis()).compareTo(timeoutDuration) > 0) { timeoutOccured = true; } } return timeoutOccured; } protected boolean isTimeoutOccured2(Duration timeoutDuration) { return atomicTimeOut.compareAndSet(false, new Duration(requestTime.getMillis(), new DateTime().getMillis()).compareTo(timeoutDuration) > 0); }

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  • What happens if we load already loaded class again?

    - by GK
    I mean we have a class which is already loaded in JVM. and in some other method we are unknowingly trying to load that same class, So in this situation what happens? ie will there be any error or exception saying its already loaded. If not, then is it possible that we can have modified class with some extra features and load it whenever it is required that is Hot Deployment.

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  • Trying to serialize and unserialze a Binary search tree to a file

    - by ClearMist
    I am trying to find a way to use these methods to save and restore a binary search tree that contains names and phone numbers in each node. I am just very lost and how to go about doing this. 'public void save(String fileName) { // TODO : implement this method. // save bst to its original shape. } public void restore(String fileName) { // TODO : implement this method. // restore bst from a file, if file exists. // do nothing, otherwise. File fichier = new File(fileName); if (fichier.exists()) { } }'

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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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  • 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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