public const List void getStaffList() {
                  ~~~~~???????
        return staffList

> 上次面试的时候一个老外问的，我说在getStaffList（）中对于staffList做个

> protected-copy，他没反应。

> 大家帮着想一想！谢谢啊！

> 

> pilbic class Company {

>     private List staffList;

> 

>     public List void getStaffList() {

>         return staffList;

>     }

> 

> .....

> }

> 

> public class EvilAgency() {

> 

>     public void buildContact() {

> 

>         List stafflist = myCompany.getStaffList();

>         .....

>         stafflist.clear(); //how to prevent this occuring?

>     .....

>     }

> ......

> }

> 

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