java - Progress bar with indeterminate mode on a button click doesn't work -


i using netbeans , button click function. want progress bar run click on button. mode indeterminate because calling class writetofile , work minutes in background , doesn't return value. 

private void createfilebuttonactionperformed(java.awt.event.actionevent evt) {     string str = (string) selecttypecombobox.getselecteditem();     createfilebutton.setenabled(false);// prevent more button presses     string filepaths = filechooserwindow.getselectedfile().getabsolutepath();     string selecttype =(string) selecttypecombobox.getselecteditem();     writetofile writeobj;     writeobj = new writetofile(filepaths,start,selecttype);     try     {         writeobj.selecttype();     }     catch (sqlexception | ioexception  | runtimeexception ex)     {         system.exit(0);     } }

got work:

    jprogressbar1.setvisible(true);     jprogressbar1.setindeterminate(true);     executor executor = java.util.concurrent.executors.newsinglethreadexecutor();     executor.execute(new runnable(){         @override         public void run(){        string str = (string) selecttypecombobox.getselecteditem();        createfilebutton.setenabled(false);// prevent more button presses        string filepaths = filechooserwindow.getselectedfile().getabsolutepath();        string selecttype =(string) selecttypecombobox.getselecteditem();        writetofile writeobj;        writeobj = new writetofile(filepaths,start,selecttype);       try       {        writeobj.selecttype();       }       catch (sqlexception | ioexception  | runtimeexception ex)       {        system.exit(0);       }      jprogressbar1.setvisible(false);    }

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