public class Main {
    public static void main(String[] args) {

        ArrayList<Employee> employees = new ArrayList<>();
        Employee em1 = new Employee("zhc", 20000, new MyDate(2002, 7, 9));
        Employee em2 = new Employee("myh", 10000, new MyDate(2000, 4, 2));
        Employee em3 = new Employee("zhc", 5000, new MyDate(2001, 2, 5));
        employees.add(em2);
        employees.add(em1);
        employees.add(em3);

        System.out.println("排序前");
        System.out.println(employees);

        employees.sort(new Comparator<Employee>() {
            @Override
            public int compare(Employee emp1, Employee emp2) {
                //先按照 name 排序，如果 name 相同，則按生日日期的先後排序。【即：訂製排序】
                //先對傳入的參數進行驗證
                if(!(emp1 instanceof Employee && emp2 instanceof Employee)) {
                    System.out.println("類型不正確..");
                    return 0;
                }
                //比較 name
                int i = emp1.getName().compareTo(emp2.getName());
                if(i != 0) {
                    return i;
                }

                return emp1.getBirthday().compareTo(emp2.getBirthday());//動態綁定到MyDate類的compareto方法
            }
        });

        System.out.println("排序後");
        System.out.println(employees);




        }
    }


@SuppressWarnings({"all"})
class Employee {
    private String name;
    private double sal;
    private MyDate birthday;

    public Employee(String name, double sal, MyDate birthday) {
        this.name = name;
        this.sal = sal;
        this.birthday = birthday;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getSal() {
        return sal;
    }

    public void setSal(double sal) {
        this.sal = sal;
    }

    public MyDate getBirthday() {
        return birthday;
    }

    public void setBirthday(MyDate birthday) {
        this.birthday = birthday;
    }

    @Override
    public String toString() {
        return "\nEmployee{" +
                "name='" + name + '\'' +
                ", sal=" + sal +
                ", birthday=" + birthday +
                '}';
    }
}
	
	public class MyDate implements Comparable<MyDate> {

        private int year;
        private int month;
        private int day;

        public MyDate(int year, int month, int day) {
            this.year = year;
            this.month = month;
            this.day = day;
        }

        public int getMonth() {
            return month;
        }

        public void setMonth(int month) {
            this.month = month;
        }

        public int getDay() {
            return day;
        }

        public void setDay(int day) {
            this.day = day;
        }

        public int getYear() {
            return year;
        }

        public void setYear(int year) {
            this.year = year;
        }

        @Override
        public String toString() {
            return "MyDate{" +
                    "month=" + month +
                    ", day=" + day +
                    ", year=" + year +
                    '}';
        }

        @Override
        public int compareTo(MyDate o) { //把對 year - month - day
            //如果year相同 就比較Month
            int yearMinus = year - o.getYear();
            if (yearMinus != 0) {
                return yearMinus;
            }
            //如果year相同 就比較month
            int monthMinus = month - o.getMonth();
            if (monthMinus != 0) {
                return monthMinus;
            }
            return day - o.getDay();
        }
    }