Java File Object

Get parent directory as a File object

import java.io.*;

public class GetParentDirectoryAsFile

{

 public static void main(String[] args)

{

File file = new File("C://FileIO/demo.txt");

File fileParent = file.getParentFile();

System.out.println("Parent directory is : " + fileParent.getPath());

  }

}

List File system roots

import java.io.*;

public class ListFileSystemRoots

{

public static void main(String[] args)

{

File[] rootDirectories = File.listRoots();

System.out.println("Available root directories in filesystem are :  ");

for(int i=0 ; i < rootDirectories.length ; i++)

{

System.out.println(rootDirectories[i]);

    }

  }

}

List contents of a directory

import java.io.*;

public class ListContentOfDirectory

{

public static void main(String[] args)

 {

File file = new File("C://FileIO");

String[] files = file.list();

System.out.println("Listing contents of " + file.getPath());

for(int i=0 ; i < files.length ; i++)

{

System.out.println(files[i]);

    }

  }

}

Mark file or directory Read Only

import java.io.*;

public class MarkFileReadOnly

{

public static void main(String[] args)

{

File file = new File("C://FileIO//demo.txt");

boolean blnMarked  = file.setReadOnly();

System.out.println("Was file marked read only ?: " + blnMarked);

System.out.println("Is file writable ?: " + file.canWrite());

   }

}

Rename file or directory

import java.io.*;

public class RenameFileDirectory

{

public static void main(String[] args)

{

File oldName = new File("C://FileIO//source.txt");

File newName = new File("C://FileIO//destination.txt");

boolean isFileRenamed = oldName.renameTo(newName);

if(isFileRenamed)

System.out.println("File has been renamed");

else

System.out.println("Error renaming the file");

   }

}