import?java.io.*;
import?java.util.*;

public?class?Test{
	public?static?void?main（String[]?args）{
		List?list=new?ArrayList（）;
		try?{
			File?f=new?File（“D:/Android/java/fifth/hello.txt?“）;
			Scanner?sc=new?Scanner（f）;
			int?k=0;
			while（sc.hasNextLine（））{
				k++;
				list.add（k+“:“+sc.nextLine（））;
			}
			FileWriter?fw=new?FileWriter（f）;
			for（int?i=0;i				fw.write（list.get（i）+“\r\n“）;
			fw.flush（）;
			fw.close（）;
			System.out.println（“Done！“）;
	???
		}?
		catch?（FileNotFoundException?e）?{
			e.printStackTrace（）;
		}?
		catch?（IOException?e）?{
			e.printStackTrace（）;
		}
	}
}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-09-16?10:45??fifth\
?????文件?????????193??2016-07-08?14:59??fifth\hello.txt
?????文件????????1509??2016-07-08?14:59??fifth\Test.class
?????文件?????????656??2016-07-08?14:34??fifth\Test.java