Here you can find the source of newExitActionListener(final JFrame jFrame)
public static ActionListener newExitActionListener(final JFrame jFrame)
//package com.java2s; /**//from w w w .jav a 2s . co m * Copyright 2009 - 2016 Jörgen Lundgren * * This file is part of org.macroing.cel4j. * * org.macroing.cel4j is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * org.macroing.cel4j is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with org.macroing.cel4j. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JOptionPane; public class Main { public static ActionListener newExitActionListener(final JFrame jFrame) { return e -> { switch (JOptionPane.showConfirmDialog(jFrame, "Are you sure you want to quit?")) { case JOptionPane.OK_OPTION: System.exit(0); break; default: break; } }; } }