What's wrong with my Java?

Hi all!
While doing a little maintenance under AppleJack, I've noticed for the umpteenth time that a lot (and I mean a lot, like, dozens) of permissions related to Java were repaired. There are literally tons of them, each time I repair permission, whether under a normal user session, in safe mode on with AppleJack in single user. Is there something wrong with SL's version of Java? Have some of you guys noticed the same thing? Is it dangerous?

Thanks for trying to help! I do have Onyx installed, but as far as I can remember, I haven't used it once since I installed SL: I installed it out of habit (proved handy on Tiger), but it's just gathering dust on its shelf as we speak...
As for the Terminal query you advised me to run, here's the result (sorry, it's pretty bulky, but I've noticed a difference in the first line between my entry and yours; check the letter after the dash, at the end of the first group of letters):
total 36708
drwxrwxr-t 31 root admin 1122 6 jan 19:17 .
drwxrwxr-t 31 root admin 1122 6 jan 19:17 ..
-rw-rw-r-- 1 root admin 15364 11 jan 18:46 .DS_Store
drwx------ 3 root admin 102 13 nov 11:47 .Spotlight-V100
d-wx-wx-wt 2 root staff 68 13 nov 11:04 .Trashes
srwxrwxrwx 1 root admin 0 23 déc 18:31 .dbfseventsd
---------- 1 root admin 0 11 fév 2010 .file
drwx------ 13 root admin 442 14 jan 13:08 .fseventsd
-rw------- 1 root wheel 65536 13 nov 11:46 .hotfiles.btree
[email protected] 2 root wheel 68 18 mai 2009 .vol
drwxrwxr-x+ 86 root admin 2924 12 jan 07:47 Applications
[email protected] 15 root admin 510 13 nov 15:36 Developer
drwxrwxr-t+ 59 root admin 2006 18 déc 15:06 Library
[email protected] 2 root wheel 68 11 fév 2010 Network
drwxr-xr-x 4 root wheel 136 6 jan 19:48 System
drwxr-xr-x 5 root admin 170 22 déc 23:37 Users
[email protected] 3 root admin 102 14 jan 11:45 Volumes
[email protected] 39 root wheel 1326 6 jan 19:16 bin
[email protected] 2 root admin 68 11 fév 2010 cores
dr-xr-xr-x 3 root wheel 4082 14 jan 11:44 dev
[email protected] 1 root wheel 11 13 nov 11:19 etc -> private/etc
dr-xr-xr-x 2 root wheel 1 14 jan 11:45 home
[email protected] 1 root wheel 18693813 11 nov 03:15 mach_kernel
dr-xr-xr-x 2 root wheel 1 14 jan 11:45 net
[email protected] 6 root wheel 204 13 nov 11:37 private
[email protected] 67 root wheel 2278 6 jan 19:17 sbin
[email protected] 1 root wheel 11 13 nov 11:19 tmp -> private/tmp
[email protected] 14 root wheel 476 4 déc 20:22 usr
[email protected] 1 root wheel 11 13 nov 11:19 var -> private/var
So, what gives?

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    Welcome to the forum. I think that George123 has your problem and its solution well in hand. Follow his good advice and you will have solved this problem. One other thing though just for future reference. If you post your code, here, you are going to want someone to be able to read it easily. Please use code tags when posting next time and your code will be much easier on the eye. You can find out about them here:
    http://forum.java.sun.com/help.jspa?sec=formatting

  • What is  wrong with this java

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    1. You have to precisely define "does not work."
    2. You have to use code tags to make your code readable. Re-paste it from the original source (not from you post here), highlight it, and clicke the CODE button above the message entry box.

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    Can anybody please tell me what's wrong with this code? Thanks

    String[] message = {
        "One, two, buckle your shoe",
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        "Seven, eight, lay them straight",
        "Nine, ten, this is the end",
        "Nine, ten, this is the end"
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        System.out.println(message[n]);
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        System.exit(0);

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    means: render region of block 1, then render region of block 2 etc, and no matter what, it should be consistent, since there is noplace for ambiguity. if you read it, you may think what that means, even if you dont run it you may have an idea of the picture you want to draw, but not with as3. as3 somehow manages to screw something that simple, and mixes all the blocks, and somehow uses the boundaries of one block as boundaries for other block. is like all blocks are dumped into whatever, and then uses all lines defined into it as boundaries for a unique block. it changes all boundaries and generates inconsistency between what is shown and redraw regions of the resulting picture, like lines that go to the end of the screen and then dont go away in the next frames, even tough the beginfill endfill block should prevent it
    3. event flow: i dont know what was the policy behind as3 event flow design. it is in no way similar or an extension to previous event flow, neither with any event flow in any other plattform. i dont know how most people start with as3; in my case, i unpacked, installed and when i tried to do something with what i already knew i could not, so i started reading the as3 docs, and since is like 800 pages long, i just read the basics and the rest i would 'wing it'. in the part of the event flow, there was something about bubbling and stuff, it was not clear at all and when i tried to do what is was said in the documentation (like preventing events to 'bubble', as is called in the documentation), i could not see any effect but i could see it was a mess. flash is not the only thing out there to work with pictures or to work with mouse events, but is the only one that deals with things like 'target' and 'currentTarget'. my first experience on needing this was when i was dealing with my own event handlers (so the only thing that had control over mouse was the stage, and i would admin everything via script). there were events generated everywhere, the stage got events that were not genrated directly over the stage, but got there not with stage coordinates but the coordinates relative to the sprite that generated the event. so if i hover the mopuse over the stage, and the stage has some things on it how does it work? i get multiple event calls, like it was hovering multiple times over the stage in a single frame, but in each call with different coordinates? and what if i set all child sprites as mouseenabled=false or compare like 'if (event.target != event.currenttarget)', what if i move the mouse over a child, does it prevent the move mouse event at all? or does it filter only the event call with only stage coordinates? in my case, every time i move over another clip (with mouseenabled = true), the stage gets it as 'mouse up', even tough there was never a mouse release, what the hell? do even the people at adobe know how to handle events with their own tool when they require it? why does an event 'bubble' when i have not specifically tell it to do it? mi thought is that this event flow was very poorly conceived, and tough the intention may have been that there were different cases and it shopuld cover all cases, they actually introduced new problems that were not present in traditional ways to handle it, and it is neither the easier way to handle things, and this way, a very simple problem turns into a very ugly thing because it must handle things that were not neccesary to handle, or were implicit in other situations.
    4. legacy: since as3, all interaction is different, and if you want to do things in the new plattform, using the new features, what you already knew just goes to the garbage can. when a new tool arrives, it should be an extension to previous tools (which is a reason to update instead of just buying a new tool from a different vendor). if everything i had or knew just means nothing from now on, then i can not say 'i know flash script', and my previous knowledge gives me no advantage when aproaching the new version. as3 is a new aproach that requires doc reading and stuff, even if you knew something about previous as specifications or other oo languajes. if you decide to change things from now on, like the things mentioned in this post, instead of just throwing away everything the users alerady knew about the tool, do like in java releases, they mark some things as 'deprecated', they keep working as they should, give a warning, but also a message saying this feature is deprecated, we suggest you use this library instead.
    5. lack of previous functionality: if you 'update' something, it meand all previos functionality is still there (probably improved, but not with bugs if it was working fine), plus something else. now it seems backwards, there are some things that could be done in previous versions but not in this one, like 'duplicatemovieclip'
    6. inconsistency with scripting/programming paradigms: (ok, fancy work, but fits perfectly here): as3 proposed ways to handle things, but the people who designed it got 'too creative', and they did something that is not consistent neither with previous versions of as or with other languajes. the documentations is full of things like 'it looks like x languaje or languaje family, but instead of using XXX word, you must use YYY'. great, what is this? namespaces 'work like', but 'differently' for example from java, .net, .c. its got the idea that a namespace means a grouped functionality but there are rules about where should be placed the file (ok, java has this also, .net takes care of it automatically if all files are registered in the project), but what you got is a mess that 'if you know other languajes you got the general idea, but nonetheless, even if you knew this or previosu versions of as, you still have to read whatever we decided arbitrarily just to be different'. namespaces, event handling, vars definition which is not like previous scripting neither like fully typed languajes.. is just a mess.
    7. lack of scripting and graphics integration: unlike flash and adobe tools that just got on the graphics side leaving all the scripting integratuion apart, most tools from other vendors integrate very well interacton with what is on the screen. the script editor: very poor. autocompletion? a drop down list that does not heklp at all, appears in the wrong places, and when you need it to go, it does not go (so if i want to move away from the uncalled drop down list, i have to click somewhere else, making developement slowewr instead of helping, so the drop down list does not capture all events when i dont want to). in other ides you double click somewhere and it will go to the part of code relevant to that event or whatever. for example microsoft tools, ok i am antimicrosoft, and one of the reasons was that when windows 95 got to market proposing itself as the ONLY pc os you could use if you wanted to keep useing the apps you already had, it was a lousy product full of flaws but you had to keep using it because you had no choice. what is so different from what is happening with flash just now? yet the ide of c# is awesome, works very well and seems reliable.
    adobe people: not all user are designers that just make pretty pictures. if it is not intended for scripting then why is it there. and if there are corrections to be done, they should patch all versions, not only the last one. previous version users also paid for their versions.

    Well, there is no point in arguing.
    I personally believe AS3 does exactly what it promises to do within limits (read: reasonable limits) of ECMA type of language. And sometimes it doesn’t do what we expect it to for it cannot possibly emulate everyone’s thinking process. The task, I guess, is to learn to think in terms of AS3 – not to try to make AS3 think like us. No language covers all the grounds. And no, it is not Java - with no negative or positive connotation. It is what it is. Period. I just hope that AS5 will be more Java like.
    You are right about the fact that it is not necessary to know all the aspects of language in order to perform the majority of tasks. But it is paramount to have a clear idea about such fundamental concepts as display list model and events. For instance, depth swap has no meaning in terms of AS3 because display list object stacking is controlled automatically and there is no need for all these jumping through hoops one has to perform in order to control depth in AS2. There no more gaps in depths and one always know where to find things.
    Similarly, there is no point in having duplicateMovieClip method. More conventional OOP ways of object instantiation accomplishes just that and much more. Just because OOP object instantiation needs to be learned doesn’t mean past hacks have place in modern times. duplicateMovieClip is a horse carriage standing next to SUV. What one should choose to travel?
    Events are implemented to the tee in the context of ECMA specifications. I consider Events model as very solid, it works great (exactly as expected) and never failed me. True, it takes time to get used to it. But what doesn’t?
    By the way, speaking about events, contrary to believe in Adobe’s inconsideration to their following. Events are implemented with weakly reference set to false although it would be better to have it set to true. I think this is because there are smart and considerate people out there who knew how difficult it would be for programming novices to deal with lost listeners.
    I think AS3 is million times better than AS2. And one of the reasons it came out this way is that Adobe made a very brave and wise decision to break totally loose from AS2’s inherent crap. They have created a totally new and very solid language. If they had tried to make it backward compatible – it would be a huge screw up, similar to how our friends at Microsoft are prostituting VB and VBA – extremely irritating approach IMHO.
    Also, Flash legacy issues shouldn’t be overlooked. Flash did not start as a platform for programmers. Entire timeline concept in many ways is not compatible with the best OOP practices and advancements. I think for anyone who is used to writing classes the very fact of coding on timeline sounds awkward. It feels like a hack (and AS2 IS a pile of hacks) – the same things can be nicely packaged into classes and scale indefinitely. As such I wouldn’t expect Adobe to waste time on hacking timeline concept issues by making smarter editor. They have made a new one – FlexBuilder – instead. Serious programmers realize very soon that Flash IDE is not for developing industrial strength applications anyway. So, why bother with channeling great minds into polishing path to the dead end?
    I would like to state that all this is coming form a person who knew Flash when there was no AS at all. And I applaud every new generation of this wonderful tool.
    I believe Adobe does a great job making transition from timeline paradigm to total OOP venue as smooth as possible. And no, they don’t leave their devoted followers behind contrary to many claims. They are working on making developing Flash applications as easy as possible for people of all walks. Welcome Catalyst!
    Of course there is not enough information about AS3 capabilities and features. But, on the other hand, I don’t know any area of human kind activities that does.

  • [b]Does anybody know what is wrong with my code[/b]

    I cannot see what is wrong with this code but i can't get it to compile. when i try to compile it i get the
    "Exception in thread "main" java.lang.NoClassDefFoundError:
    Is this a problem with compiling or is it a code error?
    Here is my code
    public class IntCalc{
         int value;
         public IntCalc(){
              value = 0;
         public void add(int number)     {
              value = value + number;
         public void subtract(int number){
              value = value - number;
         public int getValue()     {
              return value;
    Message was edited by:
    SHIFTER

    Youd don't have a class file. Compile it first then run it. If your compiler isnt making the .class file tell me and ill give you a link to a realy good java compiler.

  • JScrollPane, what is wrong with my code?

    Hi, I appreciated if you helped me(perhaps by trying it out yourself?)
    I wanted my JScrollPane to display what is drawn on my canvas (which may be large)by scrolling, but it says it doesn't need any vertical and horizontal scroll bars. Here is the code that has this effect
    import javax.swing.*;
    import java.awt.*;
    public class WhatsWrong extends JApplet{
    public void init(){
    Container appletCont = getContentPane();
    appletCont.setLayout(new BorderLayout());
    JPanel p = new JPanel();
    p.setLayout(new BorderLayout());
    p.add(new LargeCanvas(),BorderLayout.CENTER);
    int ver = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
    int hor = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
    JScrollPane jsp = new JScrollPane(p,ver,hor);
    appletCont.add(jsp,BorderLayout.CENTER);
    class LargeCanvas extends Canvas{
    public LargeCanvas(){
    super();
    setBackground(Color.white);
    public void paint(Graphics g){
    g.drawRect(50,50,700,700);
    and the html code:
    <html>
    <body>
    <applet code="WhatsWrong" width = 300 height = 250>
    </applet>
    </body>
    </html>
    What shall I do?
    Thanks in advance.

    What is wrong with your code is that your class, LargeCanvas must implement the Scrollable interface in order to be scrolled by a JScrollPane.
    A comment regarding your use of Canvas and Swing components: The Java Tutorial recommends that you extend JPanel to do custom painting. Canvas is what they call a "heavyweight" component and they recommend not to mix lightweight (Swing) components and heavyweight components.
    There is a lot more information on custom painting on the Java Tutorial in the Lesson "Creating a GUI with Swing.

  • What is wrong with my XPath Query ??

    Hi Guys,
    please help me to solve the following problem. Trying to execute :
    XPathAPI.selectNodeList(MyNode,"//*[starts-with()='WType']")
    throws always an exception :
    javax.xml.transform.TransformerException: FuncStartsWith only allows 2 arguments
    What doesn't that mean ? What's wrong with my query ?

    According to my XSLT book, the starts-with() function requires 2 arguments. You haven't given it any arguments, and that seems to be exactly what the error message is telling you. And it returns a boolean, so comparing that with a string isn't going to work either.
    I suggest you will find Mulberry's xsl-list a better place to ask questions about XSLT than a Java forum. You can find it here:
    http://www.mulberrytech.com/xsl/xsl-list/

  • What's wrong with my XPath statement using dom4j?

    I'm pretty new to XML. However, I did pick up a book and I'm pretty much through it. I got a copy of dom4j and I created a sample XML file. I'm able to parse the data and find out the child elements of root but I'm having problems with using XPath no matter what I do. Here's my code:
    import org.dom4j.*;
    import org.dom4j.io.*;
    import java.util.*;
    import java.io.*;
    public class XMLACL {
      org.dom4j.Document doc;
      org.dom4j.Element root;
      XMLACL(String x) {
        String tempFile = System.getProperty("user.dir") + "/winsudo.xml";
        tempFile = tempFile.replace('\\', '/');
        SAXReader xmlReader = new SAXReader();
        try {
          doc = xmlReader.read(tempFile);
        catch (Exception e) {}
        root = doc.getRootElement();
        //treeWalk();
        //iterateRootChildren("grant");
        XPath xpathSelector = DocumentHelper.createXPath("/grant[@prompt='no']");  
        List results = xpathSelector.selectNodes(doc);
        for (Iterator iter = results.iterator(); iter.hasNext(); ) {
         Element element = (Element) iter.next();
          System.out.println(element.getName());
    }And here's my XML:
    <?xml version="1.0" encoding="UTF-8"?>
    <config>
         <alias name="admin">
              <user>geneanthony</user>
              <user>mike</user>
              <user>rob</user>
         </alias>
         <grant prompt="no" runas="root" service="no">
              <user>geneanthony</user>
              <command>!ALL</command>
         </grant>
         <grant>
              <user>geneanthony</user>
              <group>users</group>
              <command>C:/Program Files/Mozilla Firefox/firefox.exe</command>
         </grant>
         <grant>
              <alias>admin</alias>
              <command>!Panels</command>
         </grant>
    </config>I'm currently getting this error:
    C:\Borland\JBuilder2005\jdk1.4\bin\javaw -classpath "C:\code\java\WinSudo\classes;C:\Borland\JBuilder2005\jdk1.4\jre\javaws\javaws.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\charsets.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\dnsns.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\ldapsec.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\localedata.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\sunjce_provider.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\im\indicim.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\im\thaiim.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\jce.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\jsse.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\plugin.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\rt.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\sunrsasign.jar;C:\Borland\JBuilder2005\jdk1.4\lib\dt.jar;C:\Borland\JBuilder2005\jdk1.4\lib\htmlconverter.jar;C:\Borland\JBuilder2005\jdk1.4\lib\tools.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\jRegistryKey.jar;C:\Borland\JBuilder2005\jdk1.4\lib\hsqldb.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\dom4j-1.6.1.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\syntax.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\IzPack-install-3.7.2.jar" winsudo.Main
    java.lang.NoClassDefFoundError: org/jaxen/JaxenException
         at org.dom4j.DocumentFactory.createXPath(DocumentFactory.java:230)
         at org.dom4j.DocumentHelper.createXPath(DocumentHelper.java:121)
         at winsudo.XMLACL.<init>(XMLACL.java:26)
         at winsudo.Main.main(Main.java:15)
    Exception in thread "main"
    Can someone tell me what's wrong with my code. None of the samples I've seen came with the XML files so I don't know if I when I start the XPATH I need to use / for the root element, or // or a forward slash and the root name. Can I please get some help!

    Thank you! I didn't haven Jaxen I thought everything was in the package and I must have missed it in the tutorials. That resolved the dropouts and I think I'm good know. I couldn't think for the life of me what I was doing wrong!

  • What's wrong with my code for comparing date retreived from db and sysdate?

    Hi all,
    I need to retrive date from the DB and compare it to system date.i have posted the code below.i get java.sql.SQL Exception:Io exception:Socket closed.
    What's wrong with the code?please help me.Thanks in advance.
    public boolean date() throws IOException, SQLException {
    Connection con1;
    long millis = System.currentTimeMillis();
    Timestamp timestamp = new java.sql.Timestamp(millis);
    ResultSet rs4 = null;
    try
    Class.forName("oracle.jdbc.driver.OracleDriver");
    con = DriverManager.getConnection(
    "jdbc:oracle:thin:@abc:1605:xyz",
    "cdf", "cdf");
    Statement stmt_exp = con.createStatement();
    rs4 = stmt_exp.executeQuery("SELECT DATE FROM TABLE_NAME")
    while (rs4.next()) {
    Timestamp timestamp2 = rs4.getTimestamp("expire_date");
    con1.close();
    catch (Exception e)
    e.printStackTrace();
    finally
    //ResultSet rs4 = null;
    //Timestamp timestamp2;
    Timestamp timestamp2 = rs4.getTimestamp("expire_date");
    if (timestamp2.compareTo(timestamp) < 0)  //sysdate < exp date
    return true;
    } else {
    return false;
    }

    Didn't you understand what BalusC said? You're closing the connection and then trying to use the ResultSet. The ResultSet will be closed when you close the connection so you can't use it anymore.
    You should close the connection last thing in your code, probably in a finally. And after you close your ResultSet and Statement.
    People on the forum help others voluntarily, it's not their job.
    Help them help you.
    Learn how to ask questions first: http://faq.javaranch.com/java/HowToAskQuestionsOnJavaRanch
    ----------------------------------------------------------------

  • What's wrong with the code?

    public void run()
    try
    {     for(;;)
         mgr = (RTPManager)RTPManager.newInstance();
         mgr.addSessionListener(this);
         mgr.addReceiveStreamListener(this);
         try{  /*****port1 = port2 = 29261, which port is only used in here
         localAddr = new SessionAddress(InetAddress.getLocalHost(), port1);
         destAddr = new SessionAddress(ipAddr, port2);
         }catch(Exception e)
              System.out.println(e + " 4");
         try{
         mgr.initialize(localAddr);
         }catch(Exception e)
         System.out.println(e + " 5");
         //set buffer
         bc = (BufferControl)mgr.getControl("javax.media.control.BufferControl");
         if (bc != null)
         bc.setBufferLength(20);
         try{
              mgr.addTarget(destAddr);
         }catch(Exception e)
         System.out.println(e + " 2");
    catch(Exception e)
         System.out.println(e+ " 3");
    the error when i run the code is like that:
    javax.media.rtp.InvalidSessionAddressException: Can't open local data port: 29261
    5
    java.io.IOException: Address already in use: Cannot bind 2
    which means there is error in :
    mgr.initialize(localAddr);
    mgr.addTarget(destAddr);
    But i don't know what's wrong with the code,
    can any one help me?

    I do not find any problem using the same ports for local and destination address with several unicasts. My problems are others.
    But note that the error is even at constructing the localAddress, I mean before trying the destinationAddress. Thus the reason cannot be the former is already in use. In fact I think the later belongs to a remote hosts. Likely, it is trying to access the destinationAddress through the localAddress, but this has not been constructed properly.

  • What's wrong with my multi-threaded Matrix Mult. code? 1 thread is fastest

    For some reason, 1 thread performs the best. What's wrong with my implementation?
    import java.util.Random;
    import java.util.Date;
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    import java.util.concurrent.TimeUnit;
    public class Matrix {     
         private int values[][];
         private int rows;
         private int columns;
         public Matrix(int r, int c) {
              this.rows = r;
              this.columns = c;
              this.values = new int[r][c];
         private void randomize() {
              Random generator = new Random();
              for (int r = 0; r < this.rows; r++) {
                   for (int c = 0; c < this.columns; c++) {
                        this.values[r][c] = generator.nextInt(10);
         public String toString() {
              String out = "";
              for (int r = 0; r < this.rows; r++) {
                   for (int c = 0; c < this.columns; c++) {
                        if (c == 0) out += "[";
                        else out += "\t";
                        out += this.values[r][c];
                   out += "]\n";
              return out;
         public boolean equals(Object obj) {
              Matrix other = (Matrix) obj;
              if (this.columns != other.columns || this.rows != other.rows)  {
                   return false;
              for (int r = 0; r < this.rows; r++) {
                   for (int c = 0; c < this.columns; c++) {
                        if (this.values[r][c] != other.values[r][c]) {
                             return false;
              return true;
         // matrix multiplication using single thread
         public Matrix times(Matrix other) {
              assert(this.columns == other.rows);
              Matrix out = new Matrix(this.rows, other.columns);
              for (int r = 0; r < this.rows; r++) {
                   for (int c = 0; c < other.columns; c++) {
                        int dotProduct = 0;
                        for (int z = 0; z < this.columns; z++) {
                             dotProduct += this.values[r][z] * other.values[z][c];
                        out.values[r][c] = dotProduct;
              return out;
         // matrix multiplication with many threads
         public Matrix ptimes(Matrix other, int numberOfThreads) throws InterruptedException { // parallel
              assert(this.columns == other.rows);
              Matrix out = new Matrix(this.rows, other.columns);
              ExecutorService threadExecutor = Executors.newFixedThreadPool(numberOfThreads);
              for (int r = 0; r < this.rows; r++) {
                   for (int c = 0; c < other.columns; c++) {
                        threadExecutor.execute(new HelperThread(r, c, this, other, out));
              threadExecutor.shutdown();
              threadExecutor.awaitTermination(2, TimeUnit.DAYS);
              return out;
         private class HelperThread implements Runnable {
              private int row;
              private int col;
              private Matrix a;
              private Matrix b;
              private Matrix out;
              HelperThread(int r, int c, Matrix a, Matrix b, Matrix o) {
                   this.row = r;
                   this.col = c;
                   this.a = a;
                   this.b = b;
                   this.out = o;
              public void run() {
                   int dotProduct = 0;
                   for (int z = 0; z < a.columns; z++) {
                        dotProduct += this.a.values[row][z] * this.b.values[z][col];
                   this.out.values[row][col] = dotProduct;
         public static void main(String[] args) throws InterruptedException {
              int size = 100;
              Matrix a = new Matrix(size, size);
              a.randomize();     
              Matrix b = new Matrix(size, size);
              b.randomize();
              for (int t = 1; t < 15; t++) {
                   long start = new Date().getTime();
                   System.out.print(t + " threads: ");
                   Matrix c = a.ptimes(b, t);
                   //System.out.println(c);
                   long finish = new Date().getTime();
                   System.out.println((finish - start) + " milliseconds");
                   Matrix d = a.times(b);
                   assert(c.equals(d));
    }

    This one is even faster. On my dual core I get:
    Warmup
    Single Threaded
    5.20616 milliseconds
    5.52872 milliseconds
    5.12708 milliseconds
    5.59048 milliseconds
    5.16104 milliseconds
    5.1838 milliseconds
    5.37104 milliseconds
    5.1788 milliseconds
    5.18636 milliseconds
    5.15736 milliseconds
    Multi Threaded with 2 threads
    3.22184 milliseconds
    2.86552 milliseconds
    2.86284 milliseconds
    3.67032 milliseconds
    3.08032 milliseconds
    2.97388 milliseconds
    2.93084 milliseconds
    3.44012 milliseconds
    2.89744 milliseconds
    2.88136 milliseconds
    As you can see the Multi-Threaded versions are now faster.
        // matrix multiplication with many threads
        ExecutorService threadExecutor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
        public Matrix ptimes(Matrix other) throws InterruptedException, ExecutionException {
            assert (this.columns == other.rows);
            Matrix out = new Matrix(this.rows, other.columns);
            Future futures[] = new Future[rows];
            for (int r = 0; r < this.rows; r++) {
                futures[r] = threadExecutor.submit(new HelperThread(r, this, other, out));
            for(Future f : futures) {
                f.get();
            return out;
        private class HelperThread implements Callable<Object> {
            private int row;
            private Matrix a;
            private Matrix b;
            private Matrix out;
            HelperThread(int r, Matrix a, Matrix b, Matrix o) {
                this.row = r;
                this.a = a;
                this.b = b;
                this.out = o;
            public String call() throws Exception {
                int dotProduct = 0;
                for (int c = 0; c < b.columns; c++) {
                    for (int z = 0; z < a.columns; z++) {
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