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java works with files

2 replies on 1 page. Most recent reply: Apr 15, 2003 12:07 AM by mike wu

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mike wu

Posts: 2
Nickname: jianj
Registered: Apr, 2003

java works with files

Posted: Apr 13, 2003 3:01 AM

Can anyone tell me how to do this?

Write a small java program which can change all of the files named *.ppp to be *.xxx under a certain directory.

Dhrubo

Posts: 32
Nickname: dhrubo
Registered: Mar, 2003

Re: java works with files

Posted: Apr 13, 2003 9:02 PM

This listing may help ya ... i had written it couple of months back

import java.io.*;
class ChangeFileNameExtension
{
public static void main(String args[])
{
String dir = "";
String newextn = "";
if(args.length == 2)
{
dir = args[0];
newextn = args[1];
}
else
{
System.out.println("Usage : java ChangeFileNameExtension <AbsoluteDirectoryPath> <NewExtenstion>");
System.exit(1);
}

File folder = new File(dir);
if(!folder.isDirectory())
{
System.out.println("Error : "+dir+" is not a directory.");
System.out.println("Program will terminate.");
System.exit(1);
}

File listOfFiles[] = folder.listFiles();

int noOfFilesCount = listOfFiles.length;
String tempFileName = "";
int index = 0 ;
for(int i = 0 ; i < noOfFilesCount ; i ++)
{

if(listOfFiles.isDirectory())
{
System.out.println("Warning : "+listOfFiles+" is not a file.");
}
else
{
tempFileName = listOfFiles.toString();
System.out.println("File : " +tempFileName);
index = tempFileName.indexOf('.');
tempFileName = tempFileName.substring(0,index+1);
System.out.println("File : " +tempFileName);
tempFileName = tempFileName + newextn;
System.out.println("Changed File Name : " +tempFileName);
listOfFiles.renameTo(new File(tempFileName));

}

}

}

}

mike wu

Posts: 2
Nickname: jianj
Registered: Apr, 2003

Re: java works with files

Posted: Apr 15, 2003 12:07 AM

Thank your very much!

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