java - JFrames method setVisible(true) or setVisible(false) not working in a loop. Frames are not displayed properly -

jframes not displaying in loop. code:-

import javax.swing.*;     import java.awt.event.*; import java.awt.*; import java.awt.event.windowadapter; import java.awt.event.windowevent;   public class swingdemo {      public static void main(string[] args) {          swingutilities.invokelater(new runnable(){             public void run()             {         final jframe jfrm= new jframe("a simple swing application");          final jframe jfrm2= new jframe("a simple swing application 2");         jfrm.setsize(275,100);          jfrm.setlocation(100,100);         jfrm2.setlocation(50,50);             jfrm2.setsize(275,100);         jfrm.setdefaultcloseoperation(jframe.exit_on_close);              jfrm2.setdefaultcloseoperation(jframe.exit_on_close);                    jlabel jlab = new jlabel("swing means powerful guis.");                  jfrm.add(jlab);             jbutton button0= new jbutton("loop");         jfrm.add(button0);                   jfrm.setlayout(new flowlayout());             jlabel jlab2 = new jlabel("swing means powerful guis again");                    jfrm2.add(jlab2);             //jfrm2.setvisible(true);                         jfrm.setvisible(true);          button0.addactionlistener(new actionlistener() {              private boolean confirmaction;              @override             public void actionperformed(actionevent e) {                  confirmaction = true;                 if (confirmaction) {                     try {                 while(true)                 {                     jfrm.setvisible(false);                                 jfrm2.setvisible(true);                          try{                         thread.sleep(15000);                     }                     catch(interruptedexception ie)                     {                         system.out.println("nothing");                     }                             jfrm2.setvisible(false);                     jfrm.setvisible(true);                     }                        } catch (throwable t) {                         t.printstacktrace(system.out);                     }                 }             }         }); }  });  }  } 

if problem not updating correctly (this thought since didn't explain issue), should try include these methods in loop:

validate(); repaint(); 

if issue different, please inform us.