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  • getting panel color

    - by user161004
    I have a program where i have a button to change the background color to red and another button to set back the default panel color. How do i get back the default color for panel??

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  • how to declare object variable name in loop

    - by user3717895
    public class Node{ Node p,l,r; int height; String s; { /** class body**/ } } String[] S=new String[5000]; int i=0; while (i<5000){ Node x=new Node(); x=S[i]; } I want to make 5000 Node object. above code assign same variable name x every time but i want different variable name . then how to declare 5000 class variable name without declaring it manually. is there something by which i can create 5000 Node class object with ease.

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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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  • 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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  • 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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  • building a hex value from integers

    - by StillLearningToCode
    i am trying to generate a hex color value from an integer input, and I'm not sure I'm using the concat method correctly. when i output the string theColor, i only get "0x", any ideas? public String generateColor(String redVal, String blueVal, String greenVal, String alphaVal){ String theColor = "0x"; theColor.concat(alphaVal); theColor.concat(redVal); theColor.concat(greenVal); theColor.concat(blueVal); return theColor; }

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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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • Submit form with our page refresh in Servlet

    - by John
    <script type="text/javascript"> $(document).ready(function() { $('.ibutton').click(function() { var ajaxdata=$("#country").val(); var value = "country="+ajaxdata; $.ajax({ url: "saveIt", type: "POST", data: value, cache: false, success: function(data){ alert("load success"); } });return false; }); }); </script> Friends, i followed every thing but its not working, upon submit, am unable to send the servlet request, saveIt is my url pattern,pls help me.

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