Here you can find the source of displayErrors(Component parent, List
public static void displayErrors(Component parent, List<String> errors)
//package com.java2s; /*/*from w w w .ja v a 2s .com*/ * EventManager * Copyright (c) 2008-2017 James Watmuff & Leonard Hall * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.Component; import java.util.List; import javax.swing.JOptionPane; public class Main { public static void displayErrors(Component parent, List<String> errors) { StringBuilder sb = new StringBuilder(); for (String error : errors) sb.append(" - " + error + "\n"); JOptionPane.showMessageDialog(parent, sb.toString(), "Invalid Input", JOptionPane.ERROR_MESSAGE); } }