I am reading “The Java Tutorial Continued, The Rest of JDK /Mary Campione,enter code here …”.
In collections chapter I’ve encountered the problems and I can’t understand them as followed:

We have a class called EmployeeRecord:

**public class EmployeeRecord implements Comparable {
            public Name name();
            public int employeeNumber();
            public Date hireDate();
                     ...
 }**

Let’s assume that the natural ordering of EmployeeRecord objects is Name-ordering

import java.util.*;
    
class EmpSort {
        static final Comparator SENIORITY_ORDER = new Comparator() {
            public int compare(Object o1, Object o2) {
                EmployeeRecord r1 = (EmployeeRecord) o1;
                EmployeeRecord r2 = (EmployeeRecord) o2;
                return r2.hireDate().compareTo(r1.hireDate());
            }
        };

    

**static final Collection employees = ... ;**  // Employee Database

    public static void main(String args[]) {
        List emp = new ArrayList(employees);
        Collections.sort(emp, SENIORITY_ORDER);
        System.out.println(emp);
    }
}

I have problem with EmployeeRecord class, I mean what is the rest of the EmployeeRecord class and also the second problem is what it should be the rest of Emplyee Database, I mean how could I add EmployeeRecord to the Employees Collection?

I have problem with the rest of The EmployeeRecord class and the rest of Cillection employee.