if (args.length != 1) {
			System.out.println("利用法：java Sample11_3 パス名");
			System.exit(1);
		}

		String dname = args[0];

		File directory = new File(dname);
		String[] dlist = directory.list();

		for (int i=0; i<dlist.length; i++) {
			System.out.println(dlist[i]);
		}