Java基础二十二（abstract应用）

编写工资系统，实现不同类型员工（多态）的按月发放工资。如果当月出现某个Employee对象的生日，则将该雇员的工资增加100元。

• (1)定义一个Employee类，该类包括：
    private成员变量name，number，birthday，其中birthday为MyDate类的对象；
    abstract方法earnings();
    toString()方法输出对象的name，number和birthday
• (2)Mydate类
    private成员变量year，month，day；
    toDateString()方法放回日期相应的字符串：XX年xX月XX日
• (3)定义salariedEmployee类继承employee类
    实现按月计算工资。该类包括：private成员变量monthlySalary；
    实现父类的抽象方法earnings（），该该方法放回monthlySalary值；
    toString（）方法输出员工类型信息及员工的name，number，birthday
• (4)参照SalaryEmployee类定义HourlyEmployee类，实现按小时计算工资的员工处理。该类包括：
    private成员变量wage和hour；
    实现父类的抽象方法earnings（），该方法返回wage*hour值
    toString（）方法输出员工类型信息及员工的name，number，birthday
• (5)定义PayrollSystem类，创建Employee变量数组并初始化，该数组存放各类雇员对象的引用。
    利用循环结构遍历数组元素，输出各个对象的类型，name，number，birthday
    当键盘键入本月月份值时，如果本月时某个Employee对象的生日，还要输出增加的工资信息

public abstract class Employee {

    private String name;
    private int number;
    private MyDate birthday;

    public Employee(String name, int number, MyDate birthday) {
        this.name = name;
        this.number = number;
        this.birthday = birthday;
    }

    public String getName() {
        return name;
    }

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

    public int getNumber() {
        return number;
    }

    public void setNumber(int number) {
        this.number = number;
    }

    public MyDate getBirthday() {
        return birthday;
    }

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

    public abstract double earnings();

    @Override
    public String toString() {
        return "name='" + name + '\'' +
                ", number=" + number +
                ", birthday=" + birthday.toDateString();
    }
}

public class 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 getYear() {
        return year;
    }

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

    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 String toDateString(){
        return year + "年" + month + "月" + day + "日";
    }
}

public class SalariedEmployee extends Employee{

    private double monthlySalary;

    public double getMonthlySalary() {
        return monthlySalary;
    }

    public void setMonthlySalary(double monthlySalary) {
        this.monthlySalary = monthlySalary;
    }

    public SalariedEmployee(String name, int number, MyDate birthday) {
        super(name, number, birthday);
    }

    public SalariedEmployee(String name, int number, MyDate birthday, double monthlySalary) {
        super(name, number, birthday);
        this.monthlySalary = monthlySalary;
    }

    @Override
    public double earnings() {
        return monthlySalary;
    }

    public String toString(){
        return "SalariedEmployee[" + super.toString() + "]";
    }
}

public class HourlyEmployee extends Employee{

    private int wage;//每小时工资
    private int hour;//月工作的小时数

    public int getWage() {
        return wage;
    }

    public void setWage(int wage) {
        this.wage = wage;
    }

    public int getHour() {
        return hour;
    }

    public void setHour(int hour) {
        this.hour = hour;
    }

    public HourlyEmployee(String name, int number, MyDate birthday) {
        super(name, number, birthday);
    }

    public HourlyEmployee(String name, int number, MyDate birthday, int wage, int hour) {
        super(name, number, birthday);
        this.wage = wage;
        this.hour = hour;
    }

    @Override
    public double earnings() {
        return wage * hour;
    }

    @Override
    public String toString() {
        return "HourlyEmployee[" +
                super.toString() + "]";
    }
}

public class PayrollSystem {

    public static void main(String[] args) {

        //方式一：
//        Scanner scanner = new Scanner(System.in);
//        System.out.println("请输入当月的月份：");
//        int month = scanner.nextInt();
//
        //方式二：
        Calendar calendar = Calendar.getInstance();
        int month = calendar.get(Calendar.MONTH);//获取当前的月份
//        System.out.println(month + 1);//一月份为0

        Employee[] emps = new Employee[2];

        emps[0] = new SalariedEmployee("jasen", 1002, new MyDate(1992, 11, 28), 10000);//多态，存放子类对象
        emps[1] = new HourlyEmployee("rose", 2001, new MyDate(1991, 5, 6), 60,240);

        for(int i = 0; i < emps.length; i++){

            if((month + 1) == emps[i].getBirthday().getMonth()){
                System.out.println("生日快乐！奖励一百元");
                System.out.println(emps[i]);
                double salary = emps[i].earnings();
                System.out.println("月工资为:" + (salary + 100));
            }else {
                System.out.println(emps[i]);
                double salary = emps[i].earnings();
                System.out.println("月工资为:" + salary);

            }
        }


    }
}