用Java写一个家教系统项目的代码
```
import java.util.*;
public class TutorSystem {
  public static void main(String[] args) {
   
    // Create an ArrayList of Tutors 
    ArrayList<Tutor> tutors = new ArrayList<Tutor>();
    // Create a map to store tutor information by subject 
    Map<String, ArrayList<Tutor>> tutorMap = new HashMap<String, ArrayList<Tutor>>();
    // Create a map to store student information by zip code 
    Map<String, ArrayList<Student>> studentMap = new HashMap<String, ArrayList<Student>>();
    // Create a set to store the subjects that a tutor can teach 
    Set<String> subjects = new HashSet<String>();
    // Populate the tutor, subject and student maps 
    populateTutors(tutors, tutorMap, subjects);
    populateStudents(studentMap);
    // Welcome user and prompt for action 
    System.out.println("Welcome to the tutor system! What would you like to do? Type 'help' for a list of options.");
    Scanner scanner = new Scanner(System.in);
中文写代码软件    String input = Line();
    while (!input.equals("quit")) {
      // Process action
      processCommand(input, tutors, tutorMap, studentMap, subjects, scanner);
      // Ask for next command
      System.out.println("What would you like to do now?");
      input = Line();
    }
    System.out.println("Thank you for using the tutor system. Goodbye!");
  }
  // Method to populate tutor information in the tutor and subject maps 
  public static void populateTutors(ArrayList<Tutor> tutors, Map<String, ArrayList<Tutor>> tutorMap, Set<String> subjects) {
    // Read in tutor information from file
    // ....
    // Populate tutor and subject maps
    for (Tutor tutor : tutors) {
      // Store tutor in tutor map 
      if (ainsKey(tutor.subject)) {
        (tutor.subject).add(tutor);
      } else {
        ArrayList<Tutor> tutorList = new ArrayList<Tutor>();
        tutorList.add(tutor);
        tutorMap.put(tutor.subject, tutorList);
      }
      // Store subject in subjects set
      subjects.add(tutor.subject);
    }
  }
  // Method to populate student information in the student map
  public static void populateStudents(Map<String, ArrayList<Student>> studentMap) {
    // Read in student information from file
    // ...
    // Populate student map
    for (Student student : students) {
      // Store student in student map
      if (ainsKey(student.zipCode)) {
        (student.zipCode).add(student);
      } else {
        ArrayList<Student> studentList = new ArrayList<Student>();
        studentList.add(student);
        studentMap.put(student.zipCode, studentList);
      }
    }
  }
  // Method to process a command
  public static void processCommand(String input, ArrayList<Tutor> tutors, Map<String, ArrayList<Tutor>> tutorMap, Map<String, ArrayList<Student>> studentMap, Set<String> subjects, Scanner scanner) {
    if (input.equals("help")) {
      printHelp();
    } else if (input.equals("list tutors")) {
      listTutors(tutors);
    } else if (input.equals("list students")) {
      listStudents(studentMap);
    } else if (input.equals("find tutor")) {
      findTutor(tutorMap, scanner);
    } else if (input.equals("add tutor")) {
      addTutor(tutors, tutorMap, subjects, scanner);
    } else {
      System.out.println("Invalid command. Type 'help' for a list of commands.");
    }
  }
  // Method to print out a list of available tutor subjects
  public static void printHelp() {
    System.out.println("List of commands:");
    System.out.println("- list tutors: list all the available tutors");
    System.out.println("- list students: list all the students looking for tutors");
    System.out.println("- find tutor: search for a tutor by subject");
    System.out.println("- add tutor: add a new tutor to the system");
    System.out.println("- quit: exit the tutor system");
  }
  // Method to print out a list of tutors 
  public static void listTutors(ArrayList<Tutor> tutors) {
    System.out.println("Available tutors:");

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