java实现的教学管理系统——适合java进阶入门者

package Firstone; import java.util.ArrayList; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.text.ParseException; import java.util.List; /** * This class implements teaching assistant system * * @author npu * @version 1.0 */ public class TeachingAssistantSystem { private List<Task> catalogTask; private Task currentTask; private List<Student> studentDatabase; private static BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in)); private static PrintWriter stdOut = new PrintWriter(System.out, true); private static PrintWriter stdErr = new PrintWriter(System.err, true); public static void main(String[] args) throws IOException, ParseException { TeachingAssistantSystem application = new TeachingAssistantSystem(); application.run(); } /** * the method to judge the next react * * @throws IOException if there are any errors in input or output * @throws ParseException if there are any errors in the process of date * transformation */ private void run() throws IOException { int choice = getChoice(); while (choice != 0) { if (choice == 1) { displayCatalogTask(); } else if (choice == 2) { try { stdOut.println("Please enter the code of the task you want to display>> "); int code = Integer.parseInt(stdIn.readLine()); displayTask(code); } catch (NumberFormatException e) { stdErr.println(e); } } else if (choice == 3) { displayCurrentTask(); } else if (choice == 4) { displayStudentDatabase(); } else if (choice == 5) { try { stdOut.println("Please enter the code of the student>> "); int code = Integer.parseInt(stdIn.readLine()); stdOut.println(); displayTaskList(code); } catch (NumberFormatException e) { stdErr.println(e); } } else if (choice == 6) { registerCurrentTask(); } else if (choice == 7) { Student student = readStudent(); while (student == null) student = readStudent(); removeStudentFromDB(student); } else if (choice == 8) { Task task = readTask(); while (task == null) task = readTask(); removeTaskFromCatalog(task); } choice = getChoice(); } stdOut.println("Bye!"); } /** * the method to print menu and get the input * * @return the input * @throws IOException if there are any errors in the input or output */ private int getChoice() throws IOException { int input; do { try { stdOut.println(); stdOut.print("[0] Quit\n" + "[1] Display the task catalog\n" + "[2] Display a task published by task code\n" + "[3] Display the current task\n" + "[4] Display the student database\n" + "[5] Display the task of a student by student code\n" + "[6] Register the current task\n" + "[7] Remove a student by student code\n" + "[8] Remove a task by task code\n" + "choice>> \n"); stdOut.flush(); input = Integer.parseInt(stdIn.readLine()); stdOut.println(); if (0 <= input && input <= 8) { break; } else { stdErr.print("Invalid choice: " + input); } } catch (NumberFormatException nfe) { stdErr.println(nfe); } } while (true); return input; } /** * the constructor * * @throws ParseException if there are any errors in the process of date * transformation */ private TeachingAssistantSystem() throws ParseException { this.catalogTask = loadCatalog(); this.currentTask = loadCurrentTask(); this.studentDatabase = loadStudent(); } /** * load catalog of task * * @return return the list of task * @throws ParseException if there are any errors in the process of the date * transformation */ private List<Task> loadCatalog() throws ParseException { List<Task> taskList = new ArrayList<Task>(); Task math = new Homework(1, "Math", "math homework", "2018-09-18", 0, "2018-09-21"); taskList.add(math); Task algorithm = new Homework(2, "Algorithm", "algorithm homework", "2018-09-15", 0, "2018-09-18"); taskList.add(algorithm); Task computerScience = new Experiment(3, "Computer Science", "computer science experiment", "2018-09-13", 0, "2018-09-18", 2); taskList.add(computerScience); Task networkingProgramming = new Experiment(4, "Network Programming", "network programming experiment", "2018-09-12", 0, "2018-09-22", 4); taskList.add(networkingProgramming); Task numericalAnalysis = new ClassroomTask(5, "Numerical Analysis", "numerical analysis classroom task", "2018-09-6", 0); taskList.add(numericalAnalysis); Task dataMining = new ClassroomTask(6, "Data Mining", "data mining classroom task", "2018-09-3", 0); taskList.add(dataMining); return taskList; } /** * load the list of student * * @return the list of student */ private List<Student> loadStudent() { List<Student> studentList = new ArrayList<Student>(); Student thomas = new Student(1, "Thomas"); TaskScore thomasTaskScore_0 = new TaskScore(87, catalogTask.get(0), thomas); TaskScore thomasTaskScore_1 = new TaskScore(92, catalogTask.get(1), thomas); TaskScore thomasTaskScore_2 = new TaskScore(85, catalogTask.get(2), thomas); TaskScore thomasTaskScore_3 = new TaskScore(97, catalogTask.get(3), thomas); TaskScore thomasTaskScore_4 = new TaskScore(87, catalogTask.get(4), thomas); TaskScore thomasTaskScore_5 = new TaskScore(94, catalogTask.get(5), thomas); thomas.addTaskScore(thomasTaskScore_0); thomas.addTaskScore(thomasTaskScore_1); thomas.addTaskScore(thomasTaskScore_2); thomas.addTaskScore(thomasTaskScore_3); thomas.addTaskScore(thomasTaskScore_4); thomas.addTaskScore(thomasTaskScore_5); studentList.add(thomas); Student james = new Student(2, "James"); TaskScore jamesTaskScore_0 = new TaskScore(84, catalogTask.get(0), james); TaskScore jamesTaskScore_1 = new TaskScore(98, catalogTask.get(1), james); TaskScore jamesTaskScore_2 = new TaskScore(83, catalogTask.get(2), james); TaskScore jamesTaskScore_3 = new TaskScore(95, catalogTask.get(3), james); TaskScore jamesTaskScore_4 = new TaskScore(80, catalogTask.get(4), james); TaskScore jamesTaskScore_5 = new TaskScore(97, catalogTask.get(5), james); james.addTaskScore(jamesTaskScore_0); james.addTaskScore(jamesTaskScore_1); james.addTaskScore(jamesTaskScore_2); james.addTaskScore(jamesTaskScore_3); james.addTaskScore(jamesTaskScore_4); james.addTaskScore(jamesTaskScore_5); studentList.add(james); Student kobe = new Student(3, "Kobe"); TaskScore kobeTaskScore_0 = new TaskScore(87, catalogTask.get(0), kobe); TaskScore kobeTaskScore_1 = new TaskScore(93, catalogTask.get(1), kobe); TaskScore kobeTaskScore_2 = new TaskScore(84, catalogTask.get(2), kobe); TaskScore kobeTaskScore_3 = new TaskScore(99, catalogTask.get(3), kobe); TaskScore kobeTaskScore_4 = new TaskScore(84, catalogTask.get(4), kobe); TaskScore kobeTaskScore_5 = new TaskScore(91, catalogTask.get(5), kobe); kobe.addTaskScore(kobeTaskScore_0); kobe.addTaskScore(kobeTaskScore_1); kobe.addTaskScore(kobeTaskScore_2); kobe.addTaskScore(kobeTaskScore_3); kobe.addTaskScore(kobeTaskScore_4); kobe.addTaskScore(kobeTaskScore_5); studentList.add(kobe); Student curry = new Student(4, "Curry"); TaskScore curryTaskScore_0 = new TaskScore(82, catalogTask.get(0), curry); TaskScore curryTaskScore_1 = new TaskScore(99, catalogTask.get(1), curry); TaskScore curryTaskScore_2 = new TaskScore(86, catalogTask.get(2), curry); TaskScore curryTaskScore_3 = new TaskScore(96, catalogTask.get(3), curry); TaskScore curryTaskScore_4 = new TaskScore(80, catalogTask.get(4), curry); TaskScore curryTaskScore_5 = n