Here you can find the source of chooseFiles(final Component parent)
public static Set<File> chooseFiles(final Component parent)
//package com.java2s; /*/* ww w.j av a2s.c o m*/ * Copyright (c) 2015 Christopher Ritchie * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to * deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ import java.awt.Component; import java.io.File; import java.util.HashSet; import java.util.Set; import javax.swing.JFileChooser; import javax.swing.filechooser.FileFilter; public class Main { public static Set<File> chooseFiles(final Component parent) { return chooseFiles(parent, null, null); } public static Set<File> chooseFiles(final Component parent, final File startingDirectory) { return chooseFiles(parent, startingDirectory, null); } public static Set<File> chooseFiles(final Component parent, final File startingDirectory, final FileFilter filter) { JFileChooser chooser; Set<File> files = new HashSet<File>(); if (startingDirectory != null && startingDirectory.canRead()) { if (startingDirectory.isDirectory()) { chooser = new JFileChooser(startingDirectory); } else { chooser = new JFileChooser(startingDirectory.getParentFile()); } } else { chooser = new JFileChooser(); } chooser.setMultiSelectionEnabled(true); chooser.setFileSelectionMode(JFileChooser.FILES_ONLY); if (filter != null) { chooser.setFileFilter(filter); } if (chooser.showOpenDialog(parent) == JFileChooser.APPROVE_OPTION) { for (File file : chooser.getSelectedFiles()) { if (file != null && file.exists()) { files.add(file); } } } return files; } }