用java编写一个学生宿舍管理系统

好的，下面是一个简单的学生宿舍管理系统的Java代码示例：

import java.util.Scanner;

public class DormitoryManagementSystem {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        Dormitory[] dormitories = new Dormitory[3];
        Student[] students = new Student[5];
        initializeDormitories(dormitories);
        initializeStudents(students);
        int choice = 0;
        do {
            System.out.println("1. 查询宿舍信息");
            System.out.println("2. 查询学生信息");
            System.out.println("3. 分配宿舍");
            System.out.println("4. 退宿");
            System.out.println("5. 退出系统");
            System.out.print("请选择操作：");
            choice = input.nextInt();
            switch (choice) {
                case 1:
                    displayDormitoryInformation(dormitories);
                    break;
                case 2:
                    displayStudentInformation(students);
                    break;
                case 3:
                    assignDormitory(students, dormitories);
                    break;
                case 4:
                    checkoutDormitory(students, dormitories);
                    break;
                case 5:
                    System.out.println("谢谢使用！");
                    break;
                default:
                    System.out.println("输入无效，请重新输入！");
                    break;
            }
        } while (choice != 5);
    }

    private static void initializeDormitories(Dormitory[] dormitories) {
        dormitories[0] = new Dormitory("A001", "男生", 4, 2);
        dormitories[1] = new Dormitory("A002", "女生", 4, 2);
        dormitories[2] = new Dormitory("A003", "男生", 6, 3);
    }

    private static void initializeStudents(Student[] students) {
        students[0] = new Student("张三", "男", "计算机科学与技术", "A001", 101);
        students[1] = new Student("李四", "女", "信息管理", "A001", 102);
        students[2] = new Student("王五", "男", "电子工程", "A002", 201);
        students[3] = new Student("赵六", "女", "市场营销", "A002", 202);
        students[4] = new Student("钱七", "男", "软件工程", null, 0);
    }

    private static void displayDormitoryInformation(Dormitory[] dormitories) {
        System.out.println("宿舍编号\t宿舍类型\t可住人数\t已住人数\t空闲床位");
        for (Dormitory dormitory : dormitories) {
            System.out.printf("%s\t%s\t%d\t%d\t%d\n",
                    dormitory.getDormitoryNumber(),
                    dormitory.getDormitoryType(),
                    dormitory.getCapacity(),
                    dormitory.getOccupancy(),
                    dormitory.getVacancy());
        }
    }

    private static void displayStudentInformation(Student[] students) {
        System.out.println("姓名\t性别\t专业\t宿舍编号\t床位号");
        for (Student student : students) {
            System.out.printf("%s\t%s\t%s\t%s\t%d\n",
                    student.getName(),
                    student.getGender(),
                    student.getMajor(),
                    student.getDormitoryNumber() != null ? student.getDormitoryNumber() : "",
                    student.getBedNumber());
        }
    }

    private static void assignDormitory(Student[] students, Dormitory[] dormitories) {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入学生姓名：");
        String name = input.nextLine();
        System.out.print("请输入学生性别：");
        String gender = input.nextLine();
        System.out.print("请输入学生专业：");
        String major = input.nextLine();
        System.out.print("请输入宿舍类型（男生/女生）：");
        String dormitoryType = input.nextLine();
        Dormitory dormitory = findVacantDormitory(dormitories, dormitoryType);
        if (dormitory != null) {
            int bedNumber = dormitory.allocateBed();
            if (bedNumber > 0) {
                Student student = new Student(name, gender, major, dormitory.getDormitoryNumber(), bedNumber);
                addStudent(students, student);
                System.out.printf("为学生 %s 分配了 %s 宿舍的床位 %d\n", name, dormitoryType, bedNumber);
            } else {
                System.out.printf("%s 宿舍已无空闲床位！\n", dormitoryType);
            }
        } else {
            System.out.printf("没有空闲的 %s 宿舍！\n", dormitoryType);
        }
    }

    private static Dormitory findVacantDormitory(Dormitory[] dormitories, String dormitoryType) {
        for (Dormitory dormitory : dormitories) {
            if (dormitory.getDormitoryType().equals(dormitoryType) && dormitory.getVacancy() > 0) {
                return dormitory;
            }
        }
        return null;
    }

    private static void addStudent(Student[] students, Student student) {
        for (int i = 0; i < students.length; i++) {
            if (students[i] == null) {
                students[i] = student;
                break;
            }
        }
    }

    private static void checkoutDormitory(Student[] students, Dormitory[] dormitories) {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入学生姓名：");
        String name = input.nextLine();
        boolean found = false;
        for (Student student : students) {
            if (student != null && student.getName().equals(name)) {
                found = true;
                Dormitory dormitory = findDormitory(dormitories, student.getDormitoryNumber());
                if (dormitory != null) {
                    dormitory.deallocateBed(student.getBedNumber());
                    removeStudent(students, student);
                    System.out.printf("学生 %s 退宿成功！\n", name);
                }
                break;
            }
        }
        if (!found) {
            System.out.printf("未找到姓名为 %s 的学生！\n", name);
        }
    }

    private static Dormitory findDormitory(Dormitory[] dormitories, String dormitoryNumber) {
        for (Dormitory dormitory : dormitories) {
            if (dormitory != null && dormitory.getDormitoryNumber().equals(dormitoryNumber)) {
                return dormitory;
            }
        }
        return null;
    }

    private static void removeStudent(Student[] students, Student student) {
        for (int i = 0; i < students.length; i++) {
            if (students[i] != null && students[i].equals(student)) {
                students[i] = null;
                break;
            }
        }
    }

}

class Dormitory {

    private String dormitoryNumber;
    private String dormitoryType;
    private int capacity;
    private int occupancy;
    private int[] beds;

    public Dormitory(String dormitoryNumber, String dormitoryType, int capacity, int occupancy) {
        this.dormitoryNumber = dormitoryNumber;
        this.dormitoryType = dormitoryType;
        this.capacity = capacity;
        this.occupancy = occupancy;