JAVA 员工管理系统（用抽象类实现），简易版。

package Demo513;  2 /*  3 定义一个Employee类，该类包含：  4  private 成员变量name，number，birthday，其中birthday为MyDate类的对象；  5  abstract方法earnings（）：toString（）方法输出对象的name，number和birt  6 */  7  8 public abstract class Employee {  9 private String name ; 10 private int number ; 11 private MyDate birthday; 12 13 public String getName() { 14 return name; 15  } 16 17 public void setName(String name) { 18 this.name = name; 19  } 20 21 public int getNumber() { 22 return number; 23  } 24 25 public void setNumber(int number) { 26 this.number = number; 27  } 28 29 public MyDate getBirthday() { 30 return birthday; 31  } 32 33 public void setBirthday(MyDate birthday) { 34 this.birthday = birthday; 35  } 36 37 public Employee(String name, int number, MyDate birthday) { 38 super(); 39 this.name = name; 40 this.number = number; 41 this.birthday = birthday; 42  } 43 44 public abstract double earnings(); 45 46  @Override 47 public String toString() { 48 return "name="+name+",number"+number+",birthday=" 49 +birthday.toString()+"]"; 50  } 51 }

package Demo513;  2 /*  3 MyDate类包括：  4  private成员变量month，day，year；  5  toDateString()方法返回日期对应的字符串：xxxx年xx月xx日  6 */  7 public class MyDate {  8 private int year;  9 private int month; 10 private int day; 11 12 public MyDate(int year, int month, int day) { 13 this.year = year; 14 this.month = month; 15 this.day = day; 16  } 17 public String toDateString(){ 18 return year + "年"+month+"月"+day+"日"; 19  } 20 21 public int getYear() { 22 return year; 23  } 24 25 public void setYear(int year) { 26 this.year = year; 27  } 28 29 public int getMonth() { 30 return month; 31  } 32 33 public void setMonth(int month) { 34 this.month = month; 35  } 36 37 public int getDay() { 38 return day; 39  } 40 41 public void setDay(int day) { 42 this.day = day; 43  } 44 }

package Demo513;  2 /*  3 定义 SalariedEmployee类继承Employee类，实现按月计算工资的员工处理。  4  private成员变量monthlySalary；  5 实现父类的抽象方法earnings（），该方法返回monthSalary值，toString（）方法输出员工类型信息  6 及员工的name，number，birthday。  7 */  8 public class SalariedEmployee extends Employee{  9 private double monthlySalary;//月工资 10 11 public SalariedEmployee(String name,int number,MyDate birthdat,double Salary) { 12 super(name,number,birthdat); 13 this.monthlySalary = monthlySalary; 14  } 15 16 public double earnings(){ 17 return monthlySalary; 18  } 19 20  @Override 21 public String toString() { 22 return "SalariedEmployee{"+super.toString() + 23 "monthlySalary=" + monthlySalary + 24 '}'; 25  } 26 }

package Demo513;  2 /*  3 定义 SalariedEmployee类继承Employee类，实现按月计算工资的员工处理。  4  private成员变量monthlySalary；  5 实现父类的抽象方法earnings（），该方法返回monthSalary值，toString（）方法输出员工类型信息  6 及员工的name，number，birthday。  7 */  8 public class SalariedEmployee extends Employee{  9 private double monthlySalary;//月工资 10 11 public SalariedEmployee(String name,int number,MyDate birthdat,double Salary) { 12 super(name,number,birthdat); 13 this.monthlySalary = monthlySalary; 14  } 15 16 public double earnings(){ 17 return monthlySalary; 18  } 19 20  @Override 21 public String toString() { 22 return "SalariedEmployee{"+super.toString() + 23 "monthlySalary=" + monthlySalary + 24 '}'; 25  } 26 }

package Demo513;  2 /*  3 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。  4 利用循环结构遍历数组元素。输出各个对象的类型，name，number，birthda，以及对象生日。  5 当键盘输入本月月份值是，如果本月是某个Employee对象的生日，还要输出增加工资信息。  6  7 */  8  9 import java.util.Scanner; 10 11 public class PayrollSystem { 12 public static void main(String[] args) { 13 Employee[] emp = new Employee[2]; 14  System.out.println(); 15 emp[0] = new SalariedEmployee("noo", 1001, new MyDate(2000, 9, 16), 4000); 16 emp[1] = new SalariedEmployee("hjj", 1002, new MyDate(2000, 12, 31), 5000); 17 Scanner scanner=new Scanner(System.in); 18 System.out.println("请输入本月的月份："); 19 int month =scanner.nextInt(); 20 21 for (int i = 0; i < emp.length; i++) { 22 if(month==emp[i].getBirthday().getMonth()){ 23 System.out.println("加工资100"); 24  } 25  System.out.println(emp[i]); 26  } 27 28  } 29 }