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import java.io.File;

import java.util.Arrays;

import java.util.Comparator;

public class MyFiles {

    public static void main(String[] args) {

        File fileOrDir = new File("E:\web_tut");

        MyFiles myFiles = new MyFiles();

        myFiles.traverseDepthFiles(fileOrDir);

    }

    public void traverseDepthFiles(final File fileOrDir) {

        // check xem fileOrDir la file hay foder

        if (fileOrDir.isDirectory()) {

            // in ten folder ra man hinh

            System.out.println(fileOrDir.getAbsolutePath());

            final File[] children = fileOrDir.listFiles();

            if (children == null) {

                return;

            }

            // sắp xếp file theo thứ tự tăng dần

            Arrays.sort(children, new Comparator<File>() {

                public int compare(final File o1, final File o2) {

                    return o1.getName().compareTo(o2.getName());

                }

            });

            for (final File each : children) {

                // gọi lại hàm traverseDepthFiles()

                traverseDepthFiles(each);

            }

        } else {

            // in ten file ra man hinh

            System.out.println(fileOrDir.getAbsolutePath());

        }

    }

}