Manager 和 Employee 類都是 EnterpriseMember 的子類。如何為 Employee 類編寫一個“getManager”方法（返回在其報表列表中包含此 Employee 的 Manager 實例）？提前致謝！public class Manager extends EnterpriseMember {    /*Fields */    private List reports = new ArrayList();    /*Constructor */    public Manager(String name){        super(name);    }    /*Methods */    public void addReport(Employee employee){                    reports.add(employee);    }// How can "employee" know it is in this List?}public class Employee extends EnterpriseMember {    /*Constructor */    public Manager(String name){        super(name);    }    /*Methods */    public Manager getManager(){                    return ???;    }}