一个输出的问题？
请问这道题如何输出啊？

public   class     MyDate{
private     int     year,   month,   day;
public   MyDate(){}
public   MyDate(int   day,int   month,int   year)   {
this.year   =   year;       this.month   =   month;       this.day   =   day;
}
public     void     setYear(int   year)   {   this.year   =   year;   }
public     void     setMonth(int   m)   {   month   =   m;   }
public     void     setDay(int   d)   {   day   =   d;   }
public     void     setting(){
      this.setYear(2001);       this.setMonth(9);     setDay(11);
  }
public   MyDate   copy(MyDate   d){
MyDate   m   =     new   MyDate();
m.year   =   d.year;         m.month   =   d.month;     m.day   =   d.day;
return   m;
}
public   void   display(){
System.out.println(day   +   "- "   +   month   +   "- "   +   year);
}
}  


------解决方案--------------------
public static void main(String[] args) {
MyDate d = new MyDate();
d.setting();
d.display();
}