Change the Label in java fx to different values

 for (int i = 0; i <=100;i++){
                    Thread.sleep(40); 
                    if(i<=30){
                       lblLoad.setText("Initilizing Components...");
                   }else if(i<=50){

                       lblLoad.setText("Initializing Database Coection...");
                       //new mainCLass().openDB();
                   }else if(i<=80){
                       lblLoad.setText("Initializing User Interface...");                           
                   }else{
                       lblLoad.setText("Please wait...");         
                   }
            }

This doesn't change my label. Only 1st one runs and others dont change. In java swing it worked but in Javafx doesn't. Please help!