访问者模式

  1 //部门类的抽象访问接口
  2 public interface Department {
  3 
  4     public void visit(ZSEmployee employee);//访问正式员工
  5     public void visit(LSEmployee employee);//访问临时员工
  6     
  7 }
  8 
  9 //员工类的抽象访问接口
 10 public interface Employee {
 11 
 12     public void accept(Department visitor);//接受一个访问者访问
 13     
 14 }
 15 
 16 //正式员工类
 17 public class ZSEmployee implements Employee {
 18 
 19     private String name;
 20     private int monthWorkTime;
 21     
 22     public ZSEmployee(String name, int monthWorkTime){
 23         this.name = name;
 24         this.monthWorkTime = monthWorkTime;
 25     }
 26     
 27     public String getName() {
 28         return name;
 29     }
 30 
 31     public void setName(String name) {
 32         this.name = name;
 33     }
 34 
 35     public int getMonthWorkTime() {
 36         return monthWorkTime;
 37     }
 38 
 39     public void setMonthWorkTime(int monthWorkTime) {
 40         this.monthWorkTime = monthWorkTime;
 41     }
 42 
 43     @Override
 44     public void accept(Department visitor){
 45         visitor.visit(this);
 46     }
 47     
 48 }
 49 
 50 //临时员工类
 51 public class LSEmployee implements Employee {
 52 
 53     private String name;
 54     private int dayWorkTime;
 55     
 56     public LSEmployee(String name, int dayWorkTime){
 57         this.name = name;
 58         this.dayWorkTime = dayWorkTime;
 59     }
 60 
 61     public String getName() {
 62         return name;
 63     }
 64 
 65     public void setName(String name) {
 66         this.name = name;
 67     }
 68 
 69     public int getDayWorkTime() {
 70         return dayWorkTime;
 71     }
 72 
 73     public void setDayWorkTime(int dayWorkTime) {
 74         this.dayWorkTime = dayWorkTime;
 75     }
 76     
 77     @Override
 78     public void accept(Department visitor){
 79         visitor.visit(this);
 80     }
 81     
 82 }
 83 
 84 //财务部类
 85 public class FADepartment implements Department {
 86 
 87     @Override
 88     public void visit(ZSEmployee employee){
 89         employee.getMonthWorkTime();//访问正式员工的月工作时间
 90         //根据月工作时间发工资
 91     }
 92     
 93     @Override
 94     public void visit(LSEmployee employee){
 95         employee.getDayWorkTime();//访问临时员工的日工作时间
 96         //根据日工作时间发工资
 97     }
 98     
 99 }
100 
101 //HR部类
102 public class HRDepartment implements Department {
103 
104     @Override
105     public void visit(ZSEmployee employee){
106         employee.getMonthWorkTime();//访问正式员工的月工作时间
107         //根据月工作时间是否开除你
108     }
109     
110     @Override
111     public void visit(LSEmployee employee){
112         employee.getDayWorkTime();//访问临时员工的日工作时间
113         //根据日工作时间是否开除你
114     }
115     
116 }

 1 import java.util.LinkedList;
 2 import java.util.List;
 3 
 4 public class OAManager {
 5 
 6     public static void main(String[] args) {
 7         
 8         List<Employee> list = new LinkedList<>();
 9         list.add(new ZSEmployee("正式员工A", 300));
10         list.add(new ZSEmployee("正式员工B", 400));
11         list.add(new ZSEmployee("正式员工C", 200));
12         list.add(new LSEmployee("临时员工A", 4));
13         list.add(new LSEmployee("临时员工B", 8));
14         
15         Department HR = new HRDepartment();
16         for(Employee employee: list){
17             employee.accept(HR);
18         }
19         
20     }
21 
22 }