我一直在尝试将SRP和OCP应用于此代码。该代码应允许银行员工预订或不预订硬编码约会。我无法弄清楚要创建哪些类来将这两个原理应用于代码。我想知道我需要哪些类以及应该应用的继承。
package gradedGroupProject.nonPrincipledDesign.v1;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class ORIGINAL {
public String name = "X";
public List<BankClient> bankClientsWithAppointments;
public List<Date> appointmentDates;
public static void main(String[] args) throws ParseException {
BankEmployee bankEmployee = new BankEmployee();
bankEmployee.bankClientsWithAppointments = new ArrayList<BankClient>();
bankEmployee.appointmentDates = new ArrayList<Date>();
BankClient bankClient1 = new BankClient("u1", "p1");
bankClient1.name = "A";
bankEmployee.bankClientsWithAppointments.add(bankClient1);
bankEmployee.appointmentDates.add(new SimpleDateFormat("dd/MM/yyyy").parse("20/12/2000"));
BankClient bankClient2 = new BankClient("u2", "p2");
bankClient2.name = "B";
bankEmployee.bankClientsWithAppointments.add(bankClient2);
bankEmployee.appointmentDates.add(new SimpleDateFormat("dd/MM/yyyy").parse("22/12/2000"));
print(bankEmployee.bankClientsWithAppointments);
for (int i = 0; i < bankEmployee.bankClientsWithAppointments.size(); ++i) {
Date date = bankEmployee.appointmentDates.get(i);
BankClient bankClient = bankEmployee.bankClientsWithAppointments.get(i);
System.out.println("\nCandidate date = " + date + " with client = " + bankClient.name);
System.out.println("1. Verify it");
System.out.println("2. Do not book it");
String choice = read("choice");
if (choice.equals("1"))
bankClient.bookAppointment(date, bankEmployee.name); // we assume that we answer with this call to the
// client.
System.out.println("Appointment Booked");
}
}
public static String read(String label) {
System.out.println("\nProvide your " + label + ":");
System.out.println(">");
BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
String value = null;
try {
value = input.readLine();
}
catch (IOException ex) {
ex.printStackTrace();
}
return value;
}
public static void print(List<BankClient> bankClients) {
for (int i = 0; bankClients != null && i < bankClients.size(); ++i)
bankClients.get(i).toPrint();
}
}
首先,您应该从数据实体中删除generating方法,并将它们移至其他一些类(以维护SR Principle)。新的类将成为您的“迭代者”(知道如何执行某些任务)。
对于每个迭代器角色,您都会生成一个接口,该接口指定该角色的“合同”,然后您可以对该接口有许多不同的实现。如果需要为该角色添加新的某种不同的实现,则可以创建该接口的新实现,而不必修改当前代码(OCP Principle)