java - Making a Window Appear At End of Game -

you can see summary of game here. want window pop after determined player has won or lost, , "you win", etc. in big letters. know how make frame, so:

import javax.swing.*;  public class frame extends jframe {      private static final long serialversionuid = 1l;      public static void main(string[] args) {         new frame().setvisible(true);      }      public frame() {         super("are smarter 5th grader?");         setsize(600,600);         setresizable(false);         setdefaultcloseoperation(exit_on_close);          jbutton button = new jbutton("you win");         add(button);     } } 

but not know implement @ appear @ time in game. help.

define event, cal ongamedone, raise when game over, , put frame code in event handler. more on events: https://docs.oracle.com/javase/tutorial/uiswing/events/