//【例9.6】  當前目錄文件列表。

import java.io.*;
import java.util.Date;
import java.text.SimpleDateFormat;

public class FileList 
{
    public FileList()
    {
        File dir = new File(".");                          //當前目錄
        int count_dirs=0, count_files=0;                   //目錄數和文件數
        long byte_files=0;                                 //所有文件總字節數
        
        System.out.println(dir.getAbsolutePath()+" 目錄\r\n");
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm");
        File[] files = dir.listFiles();                    //返回當前目錄中所有文件
        for (int i=0;i<files.length;i++)
        {
            System.out.print(files[i].getName()+"\t");     //顯示文件名
            if (files[i].isFile())                         //判斷指定File對象是否是文件
            {
                 System.out.print(files[i].length()+"B\t");//顯示文件長度
                 count_files++;
                 byte_files += files[i].length();
            }
            else
            {
                 System.out.print("<DIR>\t");
                 count_dirs++;
            }
            System.out.println(sdf.format(new Date(files[i].lastModified())));
        }
        System.out.println("\r\n共有 "+count_files+" 個文件，總字節數為 "+byte_files);
        System.out.println("共有 "+count_dirs+" 個目錄");
       
    }

    public static void main(String args[]) throws IOException 
    {
        new FileList();
    }
}

/*
程序運行結果如下：
C:\myjava\. 目錄

FileList.class	1532B	2006-05-26 08:20
FileList.java	2136B	2006-05-26 08:20
FileList.txt	104B	2006-05-26 08:23
java2.bat	107B	2006-03-05 01:54
mypackage	<DIR>	2006-02-26 10:02

共有 4 個文件，總字節數為 3879
共有 1 個目錄


*/
/*
        File dir = new File(".","");             //當前目錄
        File dir = new File("./","");
        File dir = new File(".\\","");

        File dir = new File("../","");           //當前目錄的上一級目錄

        File dir = new File("","");              //當前目錄的所在盤的根目錄

        File dir = new File("C:","");            //C盤根目錄C:\
        File dir = new File("C:/","");
        File dir = new File("C:\\","");

*/