java - Problem making a JProgressBar update values in Loop (Threaded) -

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am trying program update progress bar values within method while performing operations. not happen until end, , ui freezes.

after looking around similar questions problems, tried implement accepted solutions (using threads) cannot work correctly. if not there.

my program contains several classes, main being 1 automatically created netbeans on jframe design mode, there things such static void main , public main not sure of of contents. under put snippets of methods, thread implementation.

public class main extends javax.swing.jframe implements actionlistener, runnable{                                           // added implements actlis, runn.....  ...  static main _this;      // included variable  ...  public static void main(string args[]) {         main m = new main();                               // added me         new thread(m).start();                             // added me         java.awt.eventqueue.invokelater(new runnable() {             public void run() {                 new main().setvisible(true);             }         });  }  ...  public main() {         initcomponents();         _this = this;        // added me }   ...  // included these 2 methods in class  public void actionperformed(actionevent e) {                                         synchronized(this){                                                                  notifyall();                                                                 }                                                                            }                                                                                 public void run() {                                                                  try{synchronized(this){wait();}}     catch (interruptedexception e){}     progressbar.setvalue(50);                                                    }  ...  private void buttonpressed(java.awt.event.mouseevent evt) {    for(int i=0; i<=100; i++) {       for(int j=0; j<=5; j++) {          // work       }    run();    } }

all things commented i added... things putted according tutorials , answers have seen online, nothing seems work , feels have tried close million different combinations...

thanks in advance helping out.

here's basis at, if can study , understand why every piece of code there think help. feel free ask questions in comment (although i'm going bed right now!)

example:

public class progressbardemo extends jframe {     private final jprogressbar progressbar = new jprogressbar(0, 100);     private int progresscounter = 0;      public progressbardemo() {         setcontentpane(progressbar);         setpreferredsize(new dimension(100, 100));         setdefaultcloseoperation(exit_on_close);         pack();         new thread(new runnable() {             public void run() {                 while (progresscounter <= 100) {                     swingutilities.invokelater(new runnable() {                         public void run() {                             progressbar.setvalue(progresscounter++);                         }                     });                     try { thread.sleep(500); } catch (interruptedexception e) {}                 }             }         }).start();     }      public static void main(string[] args) {         swingutilities.invokelater(new runnable() {             public void run() {                 new progressbardemo().setvisible(true);             }         });     } }

two different ways approach problem, using swingworker instead:

swingworker example 1:

    ....     public progressbardemo() {         setcontentpane(progressbar);         setpreferredsize(new dimension(100, 100));         setdefaultcloseoperation(exit_on_close);         pack();          swingworker<integer, void> worker = new swingworker<integer,void>() {             public integer doinbackground() {                 while (progresscounter <= 100) {                     setprogress(progresscounter++);                     try { thread.sleep(500); } catch (interruptedexception e) {}                 }                 return 0;             }         };         worker.addpropertychangelistener(new propertychangelistener() {             public void propertychange(propertychangeevent event) {                 if ("progress".equals(event.getpropertyname())) {                     progressbar.setvalue((integer)event.getnewvalue());                 }             }         });         worker.execute();     }     ....

swingworker example 2 (not nice, interesting nonetheless):

    ....     public progressbardemo() {         setcontentpane(progressbar);         setpreferredsize(new dimension(100, 100));         setdefaultcloseoperation(exit_on_close);         pack();          new swingworker<integer,integer>() {             public integer doinbackground() {                  while (progresscounter <= 100) {                     publish(progresscounter++);                     try { thread.sleep(500); } catch (interruptedexception e) {}                                     }                 return 0;             }             public void process(list<integer> progresses) {                 integer maxprogress = null;                 (int progress : progresses) {                     if (maxprogress == null || progress > maxprogress) {                         maxprogress = progress;                     }                 }                 progressbar.setvalue(maxprogress);             }         }.execute();     }     ....

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