Date: 2019jun10 Language: Java Q. Java: best way to use File.listFiles() and File.list() A. But these member functions can turn null which might make your application crash so I always check for null and assign an empty array when that occurs. Like this:

File list[] = dir.listFiles(); if (list == null) list = new File[]{};

String[] list = dir.list(); if (list == null) list = new String[]{};

Example use:

int countDir(File dir) { String[] list = dir.list(); if (list == null) list = new String[]{}; return list.length; }