public   class  Employer {
     int  tabnom;        // табельный номер
    String name;      // ФИО
     static  NameComparator nameComparator =  new  NameComparator();
     static  TabComparator tabComparator =  new  TabComparator();

     public   static  Comparator getNameComparator() {
         return  nameComparator;
    }

     public   static  Comparator getTabComparator() {
         return  tabComparator;
    }

     static   class  NameComparator  implements  Comparator {
         public   int  compare(Object o1, Object o2) {
             return  ((Employer) o1).name.compareTo(((Employer) o2).name);
        }
       // метод equals() реализовывать не обязательно
    }

     static   class  TabComparator  implements  Comparator {
         public   int  compare(Object o1, Object o2) {
             return  ((Employer) o1).tabnom - ((Employer) o2).tabnom;
        }
    }
}

 class  TestComparators {
     public   static   void  main(String[] args) {
        Map map =  new  HashMap();

        Employer emp1 =  new  Employer();
        emp1.name = "First";
        emp1.tabnom =  201 ;

        Employer emp2 =  new  Employer();
        emp2.name = "Third";
        emp2.tabnom =  101 ;

        Employer emp3 =  new  Employer();
        emp3.name = "Second";
        emp3.tabnom =  105 ;

        map.put(emp1,  new  Integer( 1 ));
        map.put(emp2,  new  Integer( 2 ));
        map.put(emp3,  new  Integer( 3 ));

        TreeMap mapName =  new  TreeMap(Employer.getNameComparator());
        mapName.putAll(map);
        Iterator iName = mapName.keySet().iterator();
         while (iName.hasNext()) {
            Employer elem = (Employer)iName.next();
            System.out.println(elem.name);
        }

        TreeMap mapTab =  new  TreeMap(Employer.getTabComparator());
        mapTab.putAll(map);
        Iterator iTab = mapTab.keySet().iterator();
         while (iTab.hasNext()) {
            Employer elem = (Employer)iTab.next();
            System.out.println(String.valueOf(elem.tabnom));
        }
    }
}

map.put(emp1,  new  Integer( 1 ));
map.put(emp2,  new  Integer( 2 ));
map.put(emp3,  new  Integer( 3 ));

map.put( new  Integer( 1 ), emp1);
map.put( new  Integer( 2 ), emp2);
map.put( new  Integer( 3 ), emp3);