Here you can find the source of getFiles(File indir)
public static Collection<File> getFiles(File indir)
//package com.java2s; /**/* w w w . j a v a2s .c om*/ * Copyright ? 2013 - 2017 WaveMaker, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.*; import java.util.ArrayList; import java.util.Collection; import java.util.HashSet; import java.util.List; public class Main { /** * Get all files (excluding directories) under dir. */ public static Collection<File> getFiles(File indir) { if (!indir.isDirectory()) { throw new IllegalArgumentException("Expected directory as input"); } Collection<File> rtn = new HashSet<File>(); List<File> dirs = new ArrayList<File>(); dirs.add(indir); while (!dirs.isEmpty()) { File dir = dirs.remove(0); String[] files = dir.list(); for (String s : files) { File f = new File(dir, s); if (f.isDirectory()) { dirs.add(f); } else { rtn.add(f); } } } return rtn; } }