下面程序的输出结果是什么？(     )

 1.public class UpWork { 
 2.    private String freelancer; 
 3.    private boolean busy; 
 4.    public static void main(String[] args) { 
 5.        UpWork upw = new UpWork(); 
 6.        System.out.print("Busy= " + upw.busy); 
 7.        System.out.print(", Freelancer = " + upw.freelancer); 
 8.    } 
 9.}