public UnitServiceImpl(Functions functions) { this.functions = functions; this.unitMapper = new UnitMapperImpl(functions); }

时间: 2024-04-19 12:24:13 浏览: 42
这段代码是一个构造函数，它接受一个名为functions的参数，并初始化了类中的functions和unitMapper变量。 其中，functions是一个Functions类型的对象，可能是用于提供一些功能或方法的接口。 unitMapper是一个UnitMapperImpl类型的对象，它通过传入的functions对象来创建。UnitMapperImpl是一个实现了UnitMapper接口的类，可能用于处理与单位相关的操作。 总的来说，这个构造函数用于初始化UnitServiceImpl类的对象，并设置了相关的变量值。
相关问题

如果机票数组为tickets，ticket的定义如下：package search; import java.util.Date; public class ticket { private int id; private String number; private String wherestart; private String gotowhere; private Date start_time; private Date end_time; private int counts; private double price; private Date order_time; public void setId(int id) { this.id=id; } public int getId() { return id; } public void setNumber(String number) { this.number=number; } public String getNumber() { return number; } public void setWherestart(String wherestart) { this.wherestart=wherestart; } public String getWherestart() { return wherestart; } public void setGotowhere(String gotowhere) { this.gotowhere=gotowhere; } public String getGotowhere() { return gotowhere; } public void setStart_time(Date start_time) { this.start_time=start_time; } public Date getStart_time() { return start_time; } public void setEnd_time(Date end_time) { this.end_time=end_time; } public Date getEnd_time() { return end_time; } public void setAirEnterPrice(double AirEnterPrice) { this.price=AirEnterPrice; } public double getAirEnterPrice() { return price; } public void setCounts(int counts) { this.counts=counts; } public int getCounts() { return counts; } public void setOrder_time(Date order_time) { this.order_time=order_time; } public Date getOrder_time() { return order_time; } }，那么该如何修改上述界面代码

可以按照以下步骤修改上述界面代码： 1. 将 JSP 页面中的 `${ticketList}` 替换成 `${tickets}`，以对应机票数组的名称。 2. 在 JSP 页面中添加以下 JSTL 标签库： ``` <%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %> ``` 3. 修改 JSTL 标签库中的 `<c:forEach>` 标签，以遍历机票数组： ``` <c:forEach var="ticket" items="${tickets}"> <tr> <td>${ticket.id}</td> <td>${ticket.start_time}</td> <td>${ticket.end_time}</td> <td>${ticket.wherestart}</td> <td>${ticket.gotowhere}</td> <td>${ticket.price}</td> <td><input type="checkbox" name="selectedTickets" value="${ticket.id}"></td> </tr> </c:forEach> ``` 4. 根据机票类的属性名在 JSP 页面中对应显示机票的信息，例如 `${ticket.id}` 对应机票的编号，`${ticket.start_time}` 对应机票的起飞时间，以此类推。 5. 在 JSP 页面的表单中，将购买机票的处理接口 `buyTicket` 改为处理 `selectedTickets` 参数的接口。 修改后的代码如下： ``` <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>机票购买</title> </head> <body> <h1>机票选择</h1> <form action="buySelectedTickets" method="post"> <table> <thead> <tr> <th>机票编号</th> <th>起飞时间</th> <th>到达时间</th> <th>起飞地点</th> <th>到达地点</th> <th>价格</th> <th>选择</th> </tr> </thead> <tbody> <c:forEach var="ticket" items="${tickets}"> <tr> <td>${ticket.id}</td> <td>${ticket.start_time}</td> <td>${ticket.end_time}</td> <td>${ticket.wherestart}</td> <td>${ticket.gotowhere}</td> <td>${ticket.price}</td> <td><input type="checkbox" name="selectedTickets" value="${ticket.id}"></td> </tr> </c:forEach> </tbody> </table> <input type="submit" value="购买"> </form> </body> </html> ```

 Define abstract class Employee, it contains:  Data member: string id, string name, int age, double salary  Constructor  pay(): pure virtual function for calculating the employee’s salary  Derived class Manager, it contains:  Derived from class Employee.  Data members: double fixedSalary  Constructor  Implement pay() function.  Tips: The salary of managers = fixedSalary.  Derived class Saleman, it contains:  Derived from class Employee.  Data member: double salesVolume  Implement pay() function.  Tips: Saleman salary = 0.04* salesVolume.  Declare the base class pointer p and derived class object “Manager A("1001","Zhang San", 25, 5000)” and “Saleman B("1002", "Li Si", 28, 100000)” in the main function, and call the member functions pay() of different objects through the base class pointer.

Here is the implementation of the required classes and their functions in C++: ```c++ #include<iostream> #include<string> using namespace std; // Abstract Employee class class Employee { protected: string id; string name; int age; double salary; public: Employee(string id, string name, int age, double salary) { this->id = id; this->name = name; this->age = age; this->salary = salary; } virtual void pay() = 0; // Pure virtual function }; // Manager class derived from Employee class Manager : public Employee { private: double fixedSalary; public: Manager(string id, string name, int age, double fixedSalary) : Employee(id, name, age, 0) { this->fixedSalary = fixedSalary; } void pay() { salary = fixedSalary; cout << "Manager " << name << " received salary: " << salary << endl; } }; // Salesman class derived from Employee class Salesman : public Employee { private: double salesVolume; public: Salesman(string id, string name, int age, double salesVolume) : Employee(id, name, age, 0) { this->salesVolume = salesVolume; } void pay() { salary = 0.04 * salesVolume; cout << "Salesman " << name << " received salary: " << salary << endl; } }; int main() { Employee* p; // Base class pointer Manager A("1001", "Zhang San", 25, 5000); Salesman B("1002", "Li Si", 28, 100000); p = &A; // Pointing to Manager object p->pay(); // Calling pay() function of Manager p = &B; // Pointing to Salesman object p->pay(); // Calling pay() function of Salesman return 0; } ``` Output: ``` Manager Zhang San received salary: 5000 Salesman Li Si received salary: 4000 ``` Note that the `pay()` function is implemented in both `Manager` and `Salesman` classes based on their respective salary calculation formulas. The `Employee` class is an abstract class that has a pure virtual function `pay()`, which makes it mandatory for the derived classes to implement it. The base class pointer `p` is used to point to the objects of the derived classes, and by calling the `pay()` function through it, the appropriate implementation is called based on the object it is pointing to.
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