代码如下所示：
public class FileName {public static void main(String[] args) {String fileName="D:"+File.separator;File f=new File(fileName);print(f);}public static void print(File f){if(f!=null){if(f.isDirectory()){File[] fileArray=f.listFiles();if(fileArray!=null){for (int i = 0; i < fileArray.length; i++) {//递归调用print(fileArray[i]);}}}else{System.out.println(f);}}}}