netbeans - Java program with multiple windows(JPanel), how to connect them to JFrame -

i have library application permits users log in, , many other things.

i don't know how make multiple windows (views), such login, , if succesfull, closing current window , opening other user interface.

i hope have been clear.

updated answer: suppose 3 jpanel extensions called myloginpanel, mywelcomepanel, , myformpanel. i'm assuming form mention main class, among these, instead of actual components make form.

each of these panels should take care of own components.

looking @ code below, have find-and-replace names ones you're using.

suggestion: make main class implement interface, listen changes on 3 distinct panels. e.g.: user clicked on button should make application progress next panel. button has inform someone. implementer of interface.

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enum appstate {     login, welcome, form } 

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interface progresslistener {     void progressfrom(appstate currentstate); } 

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import java.awt.*; import java.awt.event.*; import javax.swing.*;  public class myform implements runnable, progresslistener {     // instance variables     private jframe frame;     private myloginpanel loginpanel;     private mywelcomepanel welcomepanel;     private myformpanel formpanel;      /** empty constructor of objects of class someclassui. */     public someclassui() {         // ...     }      /** interface initialization. */     @override     public void run() {         // these should handle own component initialization.         // should, @ least, receive reference listener.          loginpanel = new myloginpanel(this);         welcomepanel = new mywelcomepanel(this);         formpanel = new myformpanel(this);          frame = new jframe("testing");         frame.setdefaultcloseoperation(jframe.exit_on_close);         frame.setcontentpane(loginpanel);         frame.pack();         frame.setlocationrelativeto(null);         frame.setvisible(true);     }      /** */     @override     public void progressfrom(appstate whotriggeredit) {         switch (whotriggeredit) {             case login:             frame.setcontentpane(welcomepanel);             frame.pack();             return;              case welcome:             frame.setcontentpane(formpanel);             frame.pack();             return;              default: return;         }     }       /** */     public void go() {         swingutilities.invokelater(this);     }       /** */     public static void main(string[] args) {         new someclassui().go();     } } 

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class myloginpanel extends jpanel implements actionlistener {     private final progresslistener listener;      public myloginpanel(progresslistener listener) {         // components, etc.         this.listener = listener;     }          ...      /** */     @override     public void actionperformed(actionevent e) {         // validate login, or whatever.         // went well, notify listener progress.         this.listener.progressfrom(appstate.login);     } } 

instead of adding / removing elements directly jframe, may want these things on content panel of own, store instance variable (see jframe.setcontentpane()).

if want panels accessible at same time, instead of procedural step-by-step change, may want cardlayout, suggested in comments.

the suggestions give general guidelines, i'm not aware of details of needs.