java - CardLayout .show() method not working -


hi new enough java , trying learn use card feature in window builder having problem using show method. when click button doesn't change desired card. have been loosely following this tutorial

here code:

    public class homescreen {      private final string weights = "weights panel";     private final string excercise = "excercise panel";     private final string cardio = "cardio panel";             private jpanel cards;     //private cardlayout cardlayout = new cardlayout();     /**      * launch application.      */     public static void main(string[] args) {         eventqueue.invokelater(new runnable() {             public void run() {                 //schedule job event dispatch thread:                 //creating , showing application's gui.                 javax.swing.swingutilities.invokelater(new runnable()                  {                     public void run() {                         createandshowgui();                     }                  });             }         });      }      public void addcomponenttopane(container pane) {         final jpanel background = new jpanel();         background.setbackground(color.dark_gray);         background.setlayout(new cardlayout(0, 0));         jbutton btnhome = new jbutton();         btnhome.setforeground(color.light_gray);         btnhome.setfont(new font("tekton pro cond", font.plain, 22));         btnhome.setbackground(color.dark_gray);         btnhome.settext("home");         background.add(btnhome, "name_107366949842088");          jpanel cardio = new jpanel();         jpanel exercise = new jpanel();         jpanel weights = new jpanel();          jbutton btnweights_1 = new jbutton("weights");         btnweights_1.addactionlistener(new actionlistener() {             public void actionperformed(actionevent arg0) {                 system.out.println("button pressed");                 cardlayout cl = (cardlayout) (cards.getlayout()) ;                 //cl.next(cards);                 cl.show(cards, weights);             }         });                   jbutton btncardio = new jbutton("cardio");          /*          * add new cards           */         cards = new jpanel(new cardlayout());         cards.add(exercise, excercise);         exercise.setlayout(new boxlayout(exercise, boxlayout.x_axis));         exercise.add(btnweights_1);         exercise.add(btncardio);         cards.add(cardio,cardio);         cards.add(weights,"weights panel");          jbutton btnlegs = new jbutton("running");         cardio.add(btnlegs);          jbutton btnswimming = new jbutton("swimming");         cardio.add(btnswimming);          jbutton btncycling = new jbutton("cycling");         cardio.add(btncycling);          jbutton btnboxing = new jbutton("boxing");         cardio.add(btnboxing);         cards.add(weights);          jbutton btnbiceps = new jbutton("biceps");         weights.add(btnbiceps);          jbutton btnlegs_1 = new jbutton("legs");         weights.add(btnlegs_1);          jbutton btnback = new jbutton("back");         weights.add(btnback);          jbutton btnchest = new jbutton("chest");         weights.add(btnchest);          pane.add(background, borderlayout.page_start);         pane.add(cards,borderlayout.page_end);     }      public void itemstatechanged(itemevent evt) {         cardlayout cl = (cardlayout)(cards.getlayout());         cl.show(cards, (string)evt.getitem());     }          /**         * create gui , show it.  thread safety,         * method should invoked         * event dispatch thread.         */        private static void createandshowgui() {            //create , set window.            jframe frame = new jframe("cardlayoutdemo");            frame.setdefaultcloseoperation(jframe.exit_on_close);             //create , set content pane.            homescreen demo = new homescreen();            demo.addcomponenttopane(frame.getcontentpane());             //display window.            frame.pack();            frame.setvisible(true);        } }

there call add doesn't contain cardlayout constraint. because components in swing can have 1 parent, line supersedes earlier call did specify constraint.

cards.add(weights);

this statement should removed.


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