JavaでJSON-lib APIを使用してコレクションをJSON配列に変換するにはどうすればよいですか?

import java.util.*;
import net.sf.json.JSONArray;
import net.sf.json.JSONSerializer;
public class ConvertCollectionToJsonArrayTest {
   public static void main(String[] args) {
      List<String> strList = Arrays.asList("India", "Australia", "England", "South Africa");
      JSONArray jsonArray = (JSONArray)JSONSerializer.toJSON(strList);
      System.out.println(jsonArray.toString(3)); //pretty print JSON
      List<Object><object> objList = new ArrayList<Object><object>();
      objList.add("List Data");
      objList.add(new Integer(50));
      objList.add(new Long(99));
      objList.add(new Double(50.65));
      objList.add(true);
      objList.add(new char[] {&#39;X&#39;, &#39;Y&#39;, &#39;Z&#39;});
      jsonArray = (JSONArray)JSONSerializer.toJSON(objList);
      System.out.println(jsonArray.toString(3)); //pretty print JSON
   }
}
</object></object>

[
   "India",
   "Australia",
   "England",
   "South Africa"
]
[
   "List Data",
   50,
   99,
   50.65,
   true,
      [
      "X",
      "Y",
      "Z"
   ]
]