遍历一个文件目录，把所有的子目录都列出来

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class Test3 {
    private static List<String> dirList = new ArrayList<>();

    public static void main(String[] args) {
        File file = new File("E:\yht");
        getAllDirectoryName(file);
        dirList.remove(0);
        System.out.println(dirList.size());
        for (String str : dirList) {
            System.out.println(str);
        }
    }


    public static void getAllDirectoryName(File path) {
        if (!path.exists() || !path.isDirectory()) { //不是目录
            return;
        }
        dirList.add(path.getAbsolutePath());
        String[] tmpList = path.list();
        if (tmpList != null) {
            for (String iter : tmpList) {
                File tmpFile = new File(path, iter);
                if (tmpFile.isDirectory()) {
                    getAllDirectoryName(tmpFile);
                }
            }
        }
    }
}