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);
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();
}
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;
}
}
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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 +
'}';
}
}
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;
}
}
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()); } } }
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}