递归算法算出某个目录下所有目录和文件

public class $ { 
    public static void main(String[] args) { 
        String path = "D:\\111"; 
        test(path); 
    }    
 
    private static void test(String path) { 
        File f = new File(path); 
        File[] fs = f.listFiles(); 
        if (fs == null) { 
            return; 
        } 
        for (File file : fs) { 
            if (file.isFile()) { 
                System.out.println(file.getPath()); 
            } else { 
                test(file.getPath()); 
            } 
        } 
    } 
}