Solution: The Employee Sorter

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
public class EmployeeSorter {
    static class Employee {
        String name;
        int salary;
        public Employee(String name, int salary) {
            this.name = name;
            this.salary = salary;
        }
        @Override
        public String toString() { return name + " ($" + salary + ")"; }
    }
    // A specific Comparator for the Employee type
    public static class SalaryComparator implements Comparator<Employee> {
        @Override
        public int compare(Employee e1, Employee e2) {
            // Descending order: compare e2 to e1
            return Integer.compare(e2.salary, e1.salary);
        }
    }
    // A reusable generic method that can sort ANY list using ANY comparator
    public static <T> void sortItems(List<T> list, Comparator<T> sorter) {
        list.sort(sorter);
    }
    public static void main(String[] args) {
        List<Employee> staff = new ArrayList<>();
        staff.add(new Employee("Alice", 60000));
        staff.add(new Employee("Bob", 45000));
        staff.add(new Employee("Charlie", 90000));
        SalaryComparator salarySorter = new SalaryComparator();
        // The generic method infers <Employee> from the arguments
        sortItems(staff, salarySorter);
        System.out.println(staff);
    }
}