How to createw and fire GWT handler

public class MyEvent extends GwtEvent<MyEvent.MyHandler> {

    private static Type<MyHandler> TYPE;
    public static Type<LegalCreatedHandler> getType() {
        if (TYPE == null) {
            TYPE = new Type<MyHandler>();        }
        return TYPE;    }

    @Override    public Type<MyHandler> getAssociatedType() {
        return (Type) TYPE;    }

    @Override    protected void dispatch(MyEvent.MyHandler handler) {
        handler.onMyEvent(this);    }

    public interface MyHandler extends EventHandler {
        void onMyEvent(MyEvent event);
    }

}

////fire event from your class

fire(new MyEvent());

////ensure that HandlerManager is not null.

///implement handler and register this handler in class that handle this event

this.addHandler(this, MyEvent.getType());