How to make a object of Directory Class

hi
i want to pass the value "C:\\opt\\lucene\\didyoumean\\indexes\\spell" to the "spellIndexDirectory"
here is my code
package org.tiling.didyoumean;
import java.io.IOException;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.spell.SpellChecker;
import org.apache.lucene.store.Directory;
class spell{
     public static void main(String args[]){
          System.out.println("hi");
          Directory spellIndexDirectory = new Directory("C:\\opt\\lucene\\didyoumean\\indexes\\spell");
          SpellChecker spellChecker = new SpellChecker(spellIndexDirectory);
          String[] similarWords = spellChecker.suggestSimilar("jva", 1);
          System.out.println("the suggestion is"+ similarWords[0]);
this way it gives me this errorC:\Documents and Settings\sumit-i\Desktop\didyoumean\didyoumean-1.0\src\java>javac org/tiling/didyoumean/spell.java
org\tiling\didyoumean\spell.java:17: org.apache.lucene.store.Directory is abstract; cannot be instantiated
Directory spellIndexDirectory = new Directory("C:\\opt\\lucene\\didyoumean\\indexes\\spell");
^
1 error
how can i resolve this issue......i am not getting how to pass value to the Directory....
any idea please....

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1) the abstract class might have a static method that gives you an object of a subclass
2) there might be a different class that has a method (static or not) that gives you an object of the first abstract class.
3) there are subclasses in the API that you can instantiate directly.
As already suggested, re-read the docs.

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