To delete a file by using a recursive method

Recursively deleting a non-empty directory is not simply creating a file object, and then calling Delete () can be done. To safely delete a non-empty directory in a platform-independent way, you need an algorithm. The algorithm first deletes the file and then deletes all of its directories from the bottom of the directory tree.





all files in the directory can be purged by simply looping through the directory to find the file, and then calling Delete:


static public void Emptydirectory (File directory) {


file[] entries = Directory.listfiles ();


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


Entries[i].delete ();


    }


}


This simple method can also be used to delete the entire directory structure. When a directory is encountered in a loop it recursively invokes DeleteDirectory, and it also checks whether the incoming argument is a real directory. Finally, it deletes the entire directory passed in as a parameter.


static public void DeleteDirectory (File dir) throws IOException {


if (dir = null) | |!dir.isdirectory) {


throw new IllegalArgumentException (


"Argument" +dir+ "is not a directory."


              );


    }





file[] entries = Dir.listfiles ();


int sz = entries.length;





for (int i=0; i<sz; i++) {


if (entries[i].isdirectory ()) {


deletedirectory (Entries[i]);


} else {


Entries[i].delete ();


        }


}





Dir.delete ();


}


has no File.listfiles method in Java 1.1 and some J2me/personaljava variants. So you can only use File.list, its return value is an array of strings, you want to construct a new file object for each string.