How to use java class in pl/sql

Hai Guys,
here is my java class:
import java.io.*;
public class ListFiles
public static void main (String[] args)
File file=new File("C:\\");
File[] files=file.listFiles();
for(int fileInList=0; fileInList<files.length; fileInList++ )
     System.out.println(files[fileInList].toString() );
i want to use this class in pl/sql, i am new about this topic my concern are following
how to load java class
how to use in pl/sql
Guys i'll be great-full to you if you could help me out or share link or document .

First Read https://forums.oracle.com/forums/ann.jspa?annID=432
Check this link...
1. http://www.devshed.com/c/a/Oracle/Extending-PLSQL-with-Java-Libraries-concluded/
2. calling java from pl/sql in oracle 10g?its very urgent.
3. http://qamarsyed.blogspot.com/2010/07/calling-java-from-plsql-inside-oracle.html
4. http://home.c2i.net/toreingolf/oracle/java_and_plsql.htm
Hope this helps...
If someone response is helpful or correct, please mark it accordingly.

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