行为型模式之操作复杂对象结构（访问者模式）

 //员工类：抽象元素类
interface Employee {
        public void accept(Department handler); //接受一个抽象访问者访问

    }

//全职员工类：具体元素类
class FulltimeEmployee implements Employee {
        private String name;
        private double weeklyWage;
        private int workTime;

        public FulltimeEmployee(String name, double weeklyWage, int workTime) {
            this.name = name;
            this.weeklyWage = weeklyWage;
            this.workTime = workTime;
        }

        //set、get方法省略

        public void accept(Department handler) {
            handler.visit(this); //调用访问者的访问方法
        }
}

//兼职员工类：具体元素类
class ParttimeEmployee implements Employee {
        private String name;
        private double hourWage;
        private int workTime;

        public ParttimeEmployee(String name, double hourWage, int workTime) {
            this.name = name;
            this.hourWage = hourWage;
            this.workTime = workTime;
        }

        //get、set方法省略

        public void accept(Department handler) {
            handler.visit(this); //调用访问者的访问方法
        }
}

//部门类：抽象访问者类
abstract class Department {
        //声明一组重载的访问方法，用于访问不同类型的具体元素
        public abstract void visit(FulltimeEmployee employee);

        public abstract void visit(ParttimeEmployee employee);
    }

//财务部类：具体访问者类
class FADepartment extends Department {
        //实现财务部对全职员工的访问 
        public void visit(FulltimeEmployee employee) {
            int workTime = employee.getWorkTime();
            double weekWage = employee.getWeeklyWage();
            if (workTime > 40) {
                weekWage = weekWage + (workTime - 40) * 100;
            } else if (workTime < 40) {
                weekWage = weekWage - (40 - workTime) * 80;
                if (weekWage < 0) {
                    weekWage = 0;
                }
            }
            System.out.println("正式员工" + employee.getName() + "实际工资为：" + weekWage + "元。");
        }

        //实现财务部对兼职员工的访问 
        public void visit(ParttimeEmployee employee) {
            int workTime = employee.getWorkTime();
            double hourWage = employee.getHourWage();
            System.out.println("临时工" + employee.getName() + "实际工资为：" + workTime * hourWage + "元。");
        }
    }

//人力资源部类：具体访问者类 
class HRDepartment extends Department {
        // 实现人力资源部对全职员工的访问 
        public void visit(FulltimeEmployee employee) {
            int workTime = employee.getWorkTime();
            System.out.println("正式员工" + employee.getName() + "实际工作时间为：" + workTime + "小时。");
            if (workTime > 40) {
                System.out.println("正式员工" + employee.getName() + "加班时间为：" + (workTime - 40) + "小时。");
            } else if (workTime < 40) {
                System.out.println("正式员工" + employee.getName() + "请假时间为：" + (40 - workTime) + "小时。");
            }
        }

        // 实现人力资源部对兼职员工的访问 
        public void visit(ParttimeEmployee employee) {
            int workTime = employee.getWorkTime();
            System.out.println("临时工" + employee.getName() + "实际工作时间为：" + workTime + "小时。");
        }
    }

//员工列表类：对象结构 
class EmployeeList {
        //定义一个集合用于存储员工对象 
        private ArrayList<Employee> list = new ArrayList<Employee>();

        public void addEmployee(Employee employee) {
            list.add(employee);
        }

        //遍历访问员工集合中的每一个员工对象 
        public void accept(Department handler) {
            for (Object obj : list) {
                ((Employee) obj).accept(handler);
            }
        }
    }