Design Blues

Question

Hi,
I need your help in design my college assignment.
Requirement:
There is a single instance of 'Result' class.
There are multiple instances of 'TestHeader' class.
There are multiple instances of 'TestBody' class.
There are multiple instances of 'TestCase' class.
Every instance of 'Testxxxx' class uses the Result object. i.e. instances of 'TestHeader', 'TestBody' and 'TestCase' classes populate the 'Result' instance.
Problem:
Result class has to be accessible to all the Testxxxx instances. I do not want it to pass 'Result' instance as the argument to Testxxxx instances. My query is what is the best approach to make 'Result' instance available to all Testxxxx instances.
Please guide.
Warm Regards and Thanks in advance.
Jay

Answer 1

How about using a Singleton pattern:
http://java.sun.com/developer/JDCTechTips/2006/tt0113.html
public class Result {
    private static final Result INSTANCE = new Result();
    private Result(){
    public static final Result getInstance() {
        return INSTANCE;
   //  other methods
public class TestBody {
    public void testBodyMethod(){
        Result result = Result.getInstance();
}