retrieving entrypoint instance

I am a new bee starting with gwt.
I did a hello world example , I did not understand how to retrieve
the entrypoint instance to repalce content from RootPanel.
Here is the code I have

<code>
public class Application implements EntryPoint {

/**
* This is the entry point method.
*/
public void onModuleLoad() {
singleton=this;
RootPanel.get().add(new LoginScreen());
}

private static Application singleton;

public static Application get() {
return singleton;
}

public static void add(Widget widget){
RootPanel.get().clear();
RootPanel.get().add(widget);
}
}

</code>
in the above code whihc I got from some getting started tutorial , an
instanceof entry point is saved in onModuleLoad method and a
static method which return this instance ? will this not casue
issues in multithreaded ? , please suggest me how to retrieve entry
point instance ?

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