【Java 基础 实验-抽象类应用的练习】(抽象类Employee被SalariedEmployee和HourEmployee继承 , 遍历,Scanner 输出)

笔记总结:

1.Employee为抽象类,两个子类进行继承, public abstract double earning();两个子类分别实现
2.Employee[] emps[i].toString() 才可以完整地输出整个子类的信息!
3.构造函数中参数列表是对象, new HourEmployee("韩梅梅",1002,new MyDate(1998,12,21).....) ,也阔以!
4.读入流:import java.util.Scanner;
Scanner cin=new Scanner(System.in);
        int month= cin.nextInt();

实验要求:

实验题目：
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。

实验目的：对象、继承、封装、多态、抽象类的组合应用。

实验说明：
（1）定义一个Employee类，该类包含：
    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类包含:
    private成员变量month,day,year；
    toDateString()方法返回日期对应的字符串：xxxx年xx月xx日
    
（3）定义SalariedEmployee类继承Employee类，实现按月计算工资的员工处理。该类包括：
    private成员变量monthlySalary；
实现父类的抽象方法earnings(),该方法返回monthlySalary值；toString()方法输出员工类型信息及员工的name，number,birthday。
    
（4）参照SalariedEmployee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。
    
（4）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,以及该对象生日。当键盘输入本月月份值时，如果本月是某个Employee对象的生日，还要输出增加工资信息。

提示：
    //定义People类型的数组
        People c1[]=new People[10];
    //数组元素赋值
        c1[0]=new People("John","0001",20);
        c1[1]=new People("Bob","0002",19);
    //若People有两个子类Student和Officer，则数组元素赋值时，可以使父类类型的数组元素指向子类。
        c1[0]=new Student("John","0001",20,85.0);
        c1[1]=new Officer("Bob","0002",19,90.5);
    

    

View Code

工程组织:

Employee.java:

package Coding;

public abstract class Employee{
    private String name;
    private int number;
    private MyDate birthday;

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

    public abstract double earning();
}

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HourEmployee.java:

package Coding;

public class HourEmployee extends Employee{
    private double wage;
    private double hour;

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

    @Override
    public String toString() {
        return "HourEmployee{" +"name="+super.getName()
                +"number="+super.getNumber()
                +" birthday="+this.getBirthday().toString()
                + " wage=" + wage
                + ", hour=" + hour + '}';
    }

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

View Code

MyDate.java:

package Coding;

public class MyDate {
    private int year,month,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;
    }

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

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SalariedEmployee.java:

package Coding;

//月工资
public class SalariedEmployee extends Employee{
    private double monthlySalary;
    public SalariedEmployee(String name, int number, MyDate birthday, double monthlySalary) {
        super(name,number,birthday);
        this.monthlySalary=monthlySalary;
    }
    @Override
    public String toString() {
        return "HourEmployee{" +"name="+super.getName()
                +"number="+super.getNumber()
                +" birthday="+this.getBirthday().toString()
                + " monthlySalary=" + monthlySalary
                + '}';
    }
    public double earning() {
        return monthlySalary*30;
    }

    public double getMonthlySalary() {
        return monthlySalary;
    }

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

View Code

PayrollSystem.java:  (测试文件,放到Testing包里 )

package Testing;
import Coding.*;

import java.util.Scanner;

public class PayrollSystem {
    public static void main(String[] args) {
        Employee[] emps= new Employee[2];
        emps[0] = new SalariedEmployee("李雷",1001,new MyDate(1998,12,21),8800);
        emps[1] = new HourEmployee("韩梅梅",1002,new MyDate(1998,12,21),66,6);

        Scanner cin=new Scanner(System.in);
        System.out.println("请输入查找的员工的月份: ");
        int month= cin.nextInt();
        for(int i=0;i<emps.length;i++){
            if(emps[i].getBirthday().getMonth()==month){
                System.out.print("加工资加一百!!     说说而已.");

            }
            System.out.println(emps[i].toString());
        }
    }
}

View Code

输出结果:

请输入查找的员工的月份: 
12
加工资加一百!!     说说而已.HourEmployee{name=李雷number=1001 birthday=MyDate{year=1998, month=12, day=21} monthlySalary=8800.0}
加工资加一百!!     说说而已.HourEmployee{name=韩梅梅number=1002 birthday=MyDate{year=1998, month=12, day=21} wage=66.0, hour=6.0}

View Code