swing - Java - Close Window on Event -

people of internet.

i want have sort of start screen game ive been writing. far features 4 buttons each 1 of 4 players change color on click red green , vice versa representing individual "ready"-status if makes sense. used jframe , jbuttons.

now want window close if every 1 of buttons set "ready" aka button.getbackground() == color.green.

any suggestions eventlisteners use this/implementation tips/code snippets appreciated since research on windowclosing on event didnt bring me.

thank in advance , greetings.

since you're awaiting , acting on button presses, logical listener actionlistener.

consider making buttons jtogglebuttons, , in listener querying each button see if selected (isselected()) , if so, launch program. side bit, i'd consider making intro window jdialog , not jframe, either or making jpanel , swapping out via cardlayout when necessary.

for example:

import java.awt.color; import java.awt.dialog.modalitytype; import java.awt.dimension; import java.awt.window; import java.awt.event.actionevent; import java.awt.event.actionlistener; import java.util.arraylist; import java.util.list; import javax.swing.*;  public class areweready extends jpanel {     list<abstractbutton> buttons = new arraylist<>();     private int usercount;      public areweready(int usercount) {         this.usercount = usercount;         buttonlistener buttonlistener = new buttonlistener();         (int = 0; < usercount; i++) {             jbutton btn = new jbutton("user " + (i + 1));             buttons.add(btn);             btn.addactionlistener(buttonlistener);             add(btn);         }     }      private class buttonlistener implements actionlistener {         @override         public void actionperformed(actionevent e) {             abstractbutton btn = (abstractbutton) e.getsource();             color c = color.green.equals(btn.getbackground()) ? null : color.green;             btn.setbackground(c);              (abstractbutton button : buttons) {                 if (!color.green.equals(button.getbackground())) {                     // if button not have green background                     return;    // leave method                 }             }              // otherwise if green, we're here             window win = swingutilities.getwindowancestor(btn);             win.dispose();             // else launch gui         }     }      private static void createandshowgui() {         int usercount = 4;         areweready arewereadypanel = new areweready(usercount);          jframe frame = new jframe("main application");         frame.setdefaultcloseoperation(jframe.dispose_on_close);         frame.getcontentpane().add(box.createrigidarea(new dimension(400, 300)));         frame.pack();         frame.setlocationbyplatform(true);          jdialog dialog = new jdialog(frame, "are ready?", modalitytype.application_modal);         dialog.add(arewereadypanel);         dialog.pack();         dialog.setlocationbyplatform(true);         dialog.setvisible(true);          // reached when modal dialog above no longer visible         frame.setvisible(true);     }      public static void main(string[] args) {         swingutilities.invokelater(new runnable() {             public void run() {                 createandshowgui();             }         });     } }