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  • Best way to implement game loop without freezing UI thread

    - by Matt H
    I'm trying to make a simple 2D game in Java. So far I have a JFrame, with a menubar, and a class which extends JPanel and overrides it's paint method. Now, I need to get a game loop going, where I will update the position of images and so on. However, I'm stuck at how best to achieve this. Should I use multi-threading, because surely, if you put an infinite loop on the main thread, the UI (and thus my menu bar) will freeze up? Here's my code so far: import java.awt.Color; import java.awt.Graphics; import javax.swing.JPanel; @SuppressWarnings("serial") public class GameCanvas extends JPanel { public void paint(Graphics g) { while (true) { g.setColor(Color.DARK_GRAY); try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } } } } import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; @SuppressWarnings("serial") public class Main extends JFrame { GameCanvas canvas = new GameCanvas(); final int FRAME_HEIGHT = 400; final int FRAME_WIDTH = 400; public static void main(String args[]) { new Main(); } public Main() { super("Game"); JMenuBar menuBar = new JMenuBar(); JMenu fileMenu = new JMenu("File"); JMenuItem startMenuItem = new JMenuItem("Pause"); menuBar.add(fileMenu); fileMenu.add(startMenuItem); super.add(canvas); super.setVisible(true); super.setSize(FRAME_WIDTH, FRAME_WIDTH); super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); super.setJMenuBar(menuBar); } } Any pointers/tips? Also, where should I put my loop? In my main class, or my GameCanvas class? Any help is appreciated, thanks.

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  • Calculate business days

    - by AdamTheHutt
    Hi, I need a method for adding "business days" in PHP. For example, Friday 12/5 + 3 business days = Wednesday 12/10. At a minimum I need the code to understand weekends, but ideally it should account for US federal holidays as well. I'm sure I could come up with a solution by brute force if necessary, but I'm hoping there's a more elegant approach out there. Anyone? Thanks.

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  • iBatis not populating object when there are no rows found.

    - by Omnipresent
    I am running a stored procedure that returns 2 cursors and none of them have any data. I have the following mapping xml: <resultMap id="resultMap1" class="HashMap"> <result property="firstName" columnIndex="2"/> </resultMap> <resultMap id="resultMap2" class="com.somePackage.MyBean"> <result property="unitStreetName" column="street_name"/> </resultMap> <parameterMap id="parmmap" class="map"> <parameter property="id" jdbcType="String" javaType="java.lang.String" mode="IN"/> <parameter property="Result0" jdbcType="ORACLECURSOR" javaType="java.sql.ResultSet" mode="OUT" resultMap="resultMap1"/> <parameter property="Result1" jdbcType="ORACLECURSOR" javaType="java.sql.ResultSet" mode="OUT" resultMap="resultMap2"/> </parameterMap> <procedure id="proc" parameterMap="parmmap"> { call my_sp (?,?,?) } </procedure> First result set is being put in a HashMap...second resultSet is being put in a MyBean class. code in my DAO follows: HashMap map = new HashMap() map.put("id", "1234"); getSqlMapClientTemplate().queryForList("mymap.proc", map); HashMap result1 = (HashMap)((List)parmMap.get("Result0")).get(0); MyBean myObject = (MyBean)((List)parmMap.get("Result1")).get(0);//code fails here in the last line above..my code fails. It fails because second cursor has no rows and thats why nothing is put into the list. However, first cursor returns nothing as well but since results are being put into a HashMap the list for first cursor atleast has HashMap object inside it.. Why this difference? is there a way to make iBatis put an object of MyBean inside the list even if there are no rows returned? Or should I be handling this in my DAO...I want to avoid handling it in the DAO because I have whole bunch of DAO's like these.

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  • compare function for dates

    - by Chris
    I have struct as: struct stored { char *dates; // 12/May/2010, 10/Jun/2010 etc.. int ctr; }; // const struct stored structs[] = {{"12/May/2010", 1}, {"12/May/2011", 1}, {"21/May/2009", 4}, {"12/May/2011", 3}, {"10/May/2011", 8}, {"12/May/2011", 4 }}; What I want to do is to sort struct 'stored' by stored.dates. qsort(structs, 9, sizeof(struct stored*), sortdates); // sortdates function I'm not quite sure what would be a good way to sort those days? Compare them as c-strings?

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  • The most expressive web app programming language/framework combination?

    - by Thor
    When concerned about creating web applications, I often ask myself how I can make the code easy to read and above all; how to make it easy to maintain. There has been alot of inventions in the last couple of years with probably millions of programmers sharing these thoughts. So, lets test if we can squeeze the distilled knowledge of millions of StackOverflow users for this ultimate answer: Which language/framework combination in the world right now is the most expressive to do common tasks? Please provide a simple example of simplicity, add a link to more information about the language, and no more than one entry per language/framework combination. Specifications: "Web application" in this context refers to applications that runs on a server and outputs HTML/Javascript/CSS for rendering on a client browser. Any server operating system is ok. "Language/Framework combination" can for example be like Java+Struts or Java+SpringWeb or Perl+CGI or Java+ZK "Most expressive" in this context is meant to be minimal code to do common tasks. "Common tasks" include simple output/input, i.e. form specifying, displaying and processing, as well as simply styling of output. I am more concerned about minimality than about complete functionality. A decent language design can have great potential even though it is not complete.

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  • How to setPage() a JEditorPane with a localfile which is outside of the .jar file?

    - by Jaguar
    My program has the following path in the .jar file src/test/Program.class and my program is as follow... Program.java package test; import java.io.File; import java.io.IOException; import javax.swing.JEditorPane; import javax.swing.JFrame; public class Program { JEditorPane editorPane; public Program() { File file = new File("temp.htm"); try { file.createNewFile(); editorPane = new JEditorPane(); editorPane.setPage(Program.class.getResource("temp.htm")); } catch (IOException e) { e.printStackTrace(); } } public JEditorPane getEditorPane(){ return editorPane; } public static void main(String[] args) { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(400, 400); frame.setVisible(true); Program p = new Program(); frame.getContentPane().add(p.getEditorPane()); } } The problem is that I have compiled the program in a .jar file. The file.createNewFile(); creates the temp.htm file outside the .jar file So when editorPane.setPage(Program.class.getResource("temp.htm")); is called the file is not found as it searches for file inside the test package. How to setPage() the temp.htm file whiich is outside the .jar file but in the same folder as the .jar file? As the temp.htm is a localfile and I want a relative path instead of an absolute path. Thanks.

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  • How to prompt user input parameters for SQL Queries in Access 2010

    - by user1848907
    SELECT Transactions.TransactionNumber FROM Transactions WHERE (((Transactions.Date)>=#11/23/12#)) AND (((Transactions.Date)<=#11/23/12#)); The above code returns all the transaction that happened between the specified dates. But I want those dates to be defined by the user every time the query is executed. I tried using the [] operators to have the user define the criteria in the WHERE, something like this: WHERE (((Transactions.Date)>=[Input a Date])) AND (((Transactions.Date)<=[Input a Date])); But microsoft Access throws a Syntax error message. The same happens when I include the # (date operators) like this WHERE (((Transactions.Date)>=#[Input a Date]#)) AND (((Transactions.Date)<=#[Input a Date]#)); Is there anopther way to manage dates that I'm not aware of or is asking a user for dates in a query out of the question

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  • Compilig + testing an Android library with the JDK?

    - by Jarle Hansen
    Hi all, I am creating a library for Android that others can include in their own project. So far I have been working on it as a normal Java project with JDK 1.6 setup as system library. This works just fine in Eclipse when I add the android.jar. The issue comes when I try to my build script. I am running Gradle and doing a normal compile and test build cycle. My thoughts were that it does not matter if I compile it with a normal JDK, since this is not a standalone application. The benefits by creating a normal Java project is that Gradle does support this much better. My project also does not contain any UI at all. However, the problem is that of course android.jar and the JDK contains lots of the same classes and I think that this is what messes up my build script. Everything crashes when running the tests (the tests are in the same project under src/test/java). My question is, how should I create this project that is meant to be included in Android projects as a third party library? Should I create it as an Android project in Eclipse even though I am only creating a library that does not use any of the UI features? Also, should the tests be in a separate project? Thanks for all responses!

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  • How can I store large amount of data from a database to XML (speed problem, part three)?

    - by Andrija
    After getting some responses, the current situation is that I'm using this tip: http://www.ibm.com/developerworks/xml/library/x-tipbigdoc5.html (Listing 1. Turning ResultSets into XML), and XMLWriter for Java from http://www.megginson.com/downloads/ . Basically, it reads date from the database and writes them to a file as characters, using column names to create opening and closing tags. While doing so, I need to make two changes to the input stream, namely to the dates and numbers. // Iterate over the set while (rs.next()) { w.startElement("row"); for (int i = 0; i < count; i++) { Object ob = rs.getObject(i + 1); if (rs.wasNull()) { ob = null; } String colName = meta.getColumnLabel(i + 1); if (ob != null ) { if (ob instanceof Timestamp) { w.dataElement(colName, Util.formatDate((Timestamp)ob, dateFormat)); } else if (ob instanceof BigDecimal){ w.dataElement(colName, Util.transformToHTML(new Integer(((BigDecimal)ob).intValue()))); } else { w.dataElement(colName, ob.toString()); } } else { w.emptyElement(colName); } } w.endElement("row"); } The SQL that gets the results has the to_number command (e.g. to_number(sif.ID) ID ) and the to_date command (e.g. TO_DATE (sif.datum_do, 'DD.MM.RRRR') datum_do). The problems are that the returning date is a timestamp, meaning I don't get 14.02.2010 but rather 14.02.2010 00:00:000 so I have to format it to the dd.mm.yyyy format. The second problem are the numbers; for some reason, they are in database as varchar2 and can have leading zeroes that need to be stripped; I'm guessing I could do that in my SQL with the trim function so the Util.transformToHTML is unnecessary (for clarification, here's the method): public static String transformToHTML(Integer number) { String result = ""; try { result = number.toString(); } catch (Exception e) {} return result; } What I'd like to know is a) Can I get the date in the format I want and skip additional processing thus shortening the processing time? b) Is there a better way to do this? We're talking about XML files that are in the 50 MB - 250 MB filesize category.

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  • Disable day dynamically after clicking it

    - by Justin
    I have used the BeforeShowDays method to disable days on page load for my datepicker in the past. What I would like now is to click on a day, and the day should become disabled (not clickable, as if I used the BeforeShowDays method on that day). Is there a way to accomplish this?

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  • Book/topic recommendations for a programmer returning to programming.

    - by Jason Tan
    I used to be a developer in Java, PHP, perl and C/C++ (the C++ bit badly - the others not too badly, I hope). This was back in the Java 1.3/1.4 days. We used raw JDBC, swing, servlets, JSP and ant (sometimes even make). Eclipse was new. Then I joined a deployment team and became a deployment engineer and then after the deployment engineer work became a full time sys admin.You get the idea - my experience is a generation or two old in programming terms - maybe older. I'm interested in getting back into Java and perhaps Ruby development, but feel I will be waaaaay behind the technological 8 ball. Can you folks suggest some books (or sites) that would be worth reading to catch up with the last 5-10 years of the development world. I.e. what should I read to try and catch up with where development is now? I see lots of stuff on the web, but what are people in the fabled "real world" using? (are lots of people being SOA based apps? Are they using XP methodology) The sorts of things I'm interested in finding out about/catching up on are: Methodologies Design patterns APIs/Frameworks/Technologies Other stuff you deem current/interesting/relevant. So if you have any thoughts or can recommend any books (especially new classics - you know the 's equivalent to K&R C or "The mythical man month"). Thanks for any thoughts you might share.

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  • How to generate entities with Objects?

    - by 01
    I want to generate @Enities with seam-gen from existing database. However its generates very simple version only. For Example @Entity @Table(name = "badges") public class Badges implements java.io.Serializable { private Integer id; private **Integer userId**; private String name; private String date; I want him to generate @Entity @Table(name = "badges") public class Badges implements java.io.Serializable { private Integer id; private **User user**; private String name; private String date; I even have constrain on userId and it points to column User.id P.S. Im using MySQL5 and seam gen is using hbm2java to generate entities.

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  • How to set logging level for JDBCDriverLogging

    - by Scott
    I am trying to change the logging level to stop showing millions of this: <May 26, 2010 10:26:02 AM EDT> <Debug> <JDBCDriverLogging> <000000> <2336: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |> I have tried adding this to my java line: -Djava.util.logging.config.file=/foo/bar/logging.properties With this as my logging.properties file: handlers = java.util.logging.ConsoleHandler .level = OFF java.util.logging.ConsoleHandler.level = INFO No luck. I have tried this: Logger logger = Logger.getLogger("com.microsoft.sqlserver.jdbc"); Handler handler = new ConsoleHandler(); handler.setLevel(Level.INFO); logger.addHandler(handler); logger.setLevel(Level.INFO); logger.setUseParentHandlers(false); No luck. I have searched around and all ideas center around one of these two options, so I must be doing something else wrong I am using jtds-1.2.2.jar. Thanks for any suggestions.

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  • Using Regular Expressions

    - by bebeTech
    I am having problems trying to use the regular expression that I used in JavaScript. On a web page, you may have: <b>Renewal Date:</b> 03 May 2010</td> I just want to be able to pull out the 03 May 2010, remembering that a webpage has more than just the above content. The way I currently perform this using JavaScript is: DateStr = /<b>Renewal Date:<\/b>(.+?)<\/td>/.exec(returnedHTMLPage); I tried to follow some tutorials on java.util.regex.Pattern and java.util.regex.Matcher with no luck. I can't seem to be able to translate (.+?) into something they can understand?? thanks, Noeneel

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  • Replace every word with tag

    - by Sherif elKhatib
    JAVASCRIPT or JAVA solution needed The solution I am looking for could use java or javascript. I have the html code in a string so I could manipulate it before using it with java or afterwards with javascript. problem Anyway, I have to wrap each word with a tag. For example: <html> ... > Hello every one, cheers < ... </html> should be changed to <html> ... > <word>Hello</word> <word>every</word> <word>one</word>, <word>cheers</word> < ... </html> JAVASCRIPT hint I am using the following code to highlight a word; however, this will highlight the whole text belonging to a certain tag. When each word is a tag, this will work to some extent. If there is a substitute that will allow me to highlight a word at a certain position, it would also be a solution. function highlightElementAtPoint(xOrdinate, yOrdinate) { var theElement = document.elementFromPoint(xOrdinate, yOrdinate); selectedElement = theElement; theElement.style.backgroundColor = "yellow"; var theName = theElement.nodeName; var theArray = document.getElementsByTagName(theName); var theIndex = -1; for (i = 0; i < theArray.length; i++) { if (theArray[i] == theElement) { theIndex = i; } } window.androidselection.selected(theElement.innerHTML); return theName + " " + theIndex; }

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  • Migrating Ajax web application to web socket

    - by Bastan
    Hi, I think i'm just missing a little detail that is preventing me from seeing the whole picture. I have a web application which use ajax request every x time to update client with new information or tasks. I also have a long running process on the server which is a java computation engine. I would like this engine to send update to the client. I am wondering how to migrate my web app to using websocket. Probably phpwebsocket or similar. Can my server 'decide' to send information to a specific client? It seems possible looking at the php-websocket. Can my java backend long process use the websocket server to send notification to a specific client. How? well I can say that my java app could use a class that could send over websocket instead of http. But how the websocket server knows to which client to send the 'info'. I am puzzle by all this. Any document that explain this in more details? It seems that the websocket could create an instance of my web application. Thanks

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  • help configuring a mail server for use with mail.jar and activation.jar

    - by bobbyblue
    im trying to work with the below code: import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import javax.mail.*; import javax.mail.internet.*; // important import javax.mail.event.*; // important import java.net.*; import java.util.*; public class servletmail extends HttpServlet { public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException { PrintWriter out=response.getWriter(); response.setContentType("text/html"); try { Properties props=new Properties(); props.put("mail.smtp.host","localhost"); // 'localhost' for testing Session session1 = Session.getDefaultInstance(props,null); String s1 = request.getParameter("text1"); //sender (from) String s2 = request.getParameter("text2"); String s3 = request.getParameter("text3"); String s4 = request.getParameter("area1"); Message message =new MimeMessage(session1); message.setFrom(new InternetAddress(s1)); message.setRecipients (Message.RecipientType.TO,InternetAddress.parse(s2,false)); message.setSubject(s3); message.setText(s4); Transport.send(message); out.println("mail has been sent"); } catch(Exception ex) { System.out.println("ERROR....."+ex); } } } im using mail.jar and activation.jar but i cant understand how shouls i configure it with a mail server which mail server should i use will i be able to send an email using above what are the requirements a mail server? how should i configure it

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  • WPF C#: Starting crash due to client 'Region and Language' settings

    - by FrieK
    Hi, I'm working on a WPF C# application, and it seems to crash with a few random people. So eventually I found out it was the 'Region and Language' settings that was responsible. For example, if I were to set my Format to English (United States) it will work, if I set it to Swedish (Sweden) it will crash from the start. When I test this in Visual Studio 2010 it gives error 'TypeInitializationException'. More precisely it does it here (it doesn't get passed the InitializeComponent() void): private void RadioButton_Checked(object sender, RoutedEventArgs e) { Info.SortOrder = SortBy.Rank; } It claims the error at the first line, which is just setting an enum value to a variable. I guess it's just doing it there because it's the first thing it makes, or something. Anyone has any idea how to fix this? I've searched around but can't seem to find out how :( Any help is much appreciated! Thanks

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  • Django display notifications by day

    - by dana
    hi guys, i have a notification list, and i want to order them by day, meaning, that i want to have in my notification list every day a title like 'Monday 16th od September' and the notifications for that day. I did not find anywhere how it should be done thanks a lot!

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  • how to find number of weekdays in array

    - by Chamal
    i hav a array of date. In this array, i want to find how many weekdays in that array. So how can i do that using java.. *here i read lines from csv file & put those into values. *values[2] contain the dates of that csv file. *So now i want to find number of weekdays in values[2]. FileInputStream fis=new FileInputStream("c:/sample.csv"); InputStreamReader isr=new InputStreamReader(fis); BufferedReader bf = new BufferedReader(isr); while (bf.ready()) { String line = bf.readLine(); String[] values=line.split(","); String date=values[2]; }

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