List排序：?

考察的是Collection.sort()方法的使用

public class Test {

    public static void main(String[] args) {
        final List<Employee> employees = new ArrayList<Employee>();
        employees.add(new Employee(3, "张三", -13001f));
        employees.add(new Employee(32, "张三", -13001.1f));
        employees.add(new Employee(31, "张三", 12999.6f));
        Collections.sort(employees, new Comparator<Employee>() {
            // compare返回正数，表示第一个对象比第二个对象大，返回负数表示第二个对象比第一个对象大
            // o2-o1,是降序排列，o1-o2是升序排列
            public int compare(Employee o1, Employee o2) {
                    return (int) (o1.getSalary() - o2.getSalary());
            }
        });
        System.out.println(employees);
        {

        }
    }
}