projects in worspace is zero

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Java

IWorkspaceRoot myWorkspaceRoot = ResourcesPlugin.getWorkspace().getRoot();

IProject[] projects = myWorkspaceRoot.getProjects();
System.out.println("projects[].length "+ projects.length);

but the project length i am getting as output is zero.

I have tried this solution
"
Either you can create a new project in the runtime-workspace, or you can import one that's in yours using File->Import->Existing project into workspace. If you're running with the defaults of everything, that should be '../workspace/ProjectName'." as proposed in http://www.eclipse.org/forums/index.php?t=msg&goto=443901&
When i did the above solution, it did not allow me to do and said projects are already present in workspace and no project to import.

any solution???