java - Changing the default cursor to busy cursor does not work as expected -

after many attempts trying make jprogressbar work expected, became successful @ achieving goal. had used @madprogrammer's advice , used swingworker program work want.

now, want cursor change busy_cursor http://telcontar.net/misc/screeniecursors/cursor%20hourglass%20white.png when jprogressbar goes 0% 100%. i've googled , found out that

setcursor(cursor.getpredefinedcursor(cursor.wait_cursor)); 

is code it. i've tried not work expected.

relevant piece of code:

jprogressbar progress; jbutton button;      jdialog dialog;      //fields of gui class  progress=new jprogressbar(jprogressbar.horizontal,0,100); button=new jbutton("done"); dialog=new jdialog();             //done methods  progress.setvalue(0); progress.setstringpainted(true); progress.setborderpainted(true);  //also done methods  button.addactionlistener(this);   //also done methods  dialog.setlayout(new flowlayout(flowlayout.center)); dialog.settitle("please wait..."); dialog.setbounds(475,150,250,100); dialog.setmodal(true);            //also done methods  dialog.add(new jlabel("loading...")); dialog.add(progress);             //also done methods 

and here actionperformed method:

public void actionperformed(actionevent e) {     setcursor(cursor.getpredefinedcursor(cursor.wait_cursor));      task task=new task();     task.addpropertychangelistener(this);     task.execute();     dialog.setvisible(true); } 

the propertychange method:

public void propertychange(propertychangeevent evt) {     if("progress" == evt.getpropertyname()){         int progressnum = (integer) evt.getnewvalue();         progress.setvalue(progressnum);     } } 

and nested class task:

   class task extends swingworker<void, void> {         /*          * main task. executed in background thread.          */         @override         public void doinbackground() {             int progressnum = 0;             setprogress(0);              while (progressnum < 100) {                 try {                     thread.sleep(10);                 } catch (interruptedexception ex) {                     system.err.println("an error occured:"+ex);                     ex.printstacktrace();                 }                  progressnum ++;                 setprogress(math.min(progressnum, 100));             }             return null;         }          /*          * executed in event dispatching thread          */         @override         public void done() {             //setcursor(null); //turn off wait cursor             setcursor(cursor.getdefaultcursor()); //is 1 or 1 above right?             dialog.dispose();             progress.setvalue(progress.getminimum());         }     } 

when press button, jdialog jprogressbar appears , jprogressbar goes 0% 100%. during time, cursor needs changed busy_cursor http://telcontar.net/misc/screeniecursors/cursor%20hourglass%20white.png(busy cursor) , when jprogressbar reaches 100%, normal cursor(normal_cursor http://fc05.deviantart.net/fs70/i/2011/008/1/4/mouse_cursor_windows_by_mikima-d36oslj.png) needs restored.

the problem is, when press button, cursor changes busy cursor split second , then, changes original cursor. want cursor busy until jprogressbar reaches 100%.

i've added code convert cursor busy cursor in actionperformed method , restore normal cursor in done method of nested class task. note i've included necessary packages.

• what causing problem?
• how fix it?

• should use

  setcursor(null); 

  or

  setcursor(cursor.getdefaultcursor()); 

  to restore cursor?

when call setcursor() on jframe, has effect frame, not dialog. similarly, when call setcursor() on jdialog, has effect dialog, not frame. there problem: did not set cursor dialog, right?

i'm not sure whether setcursor(null) safer setcursor(cursor.getdefaultcursor()). :p