I am using a treeset which contains employee class 

TreeSet<Employee> ts = new TreeSet<Employee>(new ComparatorEmpId()); 

Requirements : 

1)My treeset should be sorted by employee Id 

2)(But I want to get the highest salaried employee from treeset (using last) . how do i do that ? 

3)[I tried to use comparator for sorting the employee Id , but for getting a highest salary I should have had the salary attribute sorted ]