Files-Directory listing in Java

This example lists the files and subdirectories in a directory.

File dir = new File("directoryName");
    String[] children = dir.list();
    if (children == null) {
        // Either dir does not exist or is not a directory
    } else {
        for (int i=0; i < children.length; i++) {
            // Get filename of file or directory
            String filename = children[i];
        }
    }
    
    // It is also possible to filter the list of returned files.
    // This example does not return any files that start with `.'.
    FilenameFilter filter = new FilenameFilter() {
        public boolean accept(File dir, String name) {
            return !name.startsWith(".");
        }
    };
    children = dir.list(filter);
    
    
    // The list of files can also be retrieved as File objects
    File[] files = dir.listFiles();
    
    // This filter only returns directories
    FileFilter fileFilter = new FileFilter() {
        public boolean accept(File file) {
            return file.isDirectory();
        }
    };
    files = dir.listFiles(fileFilter);
Code language: Java (java)

Traversing the Files and Directories Under a Directory This example implements methods that recursively visits all files and directories under a directory.

Code language: Java (java)

// Process all files and directories under dir public static void visitAllDirsAndFiles(File dir) { process(dir); if (dir.isDirectory()) { String[] children = dir.list(); for (int i=0; i