请假系统学生端的Java代码

以下是一个简单的请假系统学生端的Java代码示例，包含登录、请假和查看请假记录的功能：

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class StudentLeaveSystem {
    private static List<Student> studentList = new ArrayList<>();

    public static void main(String[] args) {
        Student student = login();
        if (student != null) {
            System.out.println("欢迎使用请假系统，" + student.getName() + "同学！");
            while (true) {
                System.out.println("请选择功能：");
                System.out.println("1. 请假");
                System.out.println("2. 查看请假记录");
                System.out.println("3. 退出");
                Scanner scanner = new Scanner(System.in);
                String choice = scanner.nextLine();
                switch (choice) {
                    case "1":
                        applyForLeave(student);
                        break;
                    case "2":
                        viewLeaveRecords(student);
                        break;
                    case "3":
                        System.out.println("再见，" + student.getName() + "同学！");
                        return;
                    default:
                        System.out.println("请选择正确的功能！");
                        break;
                }
            }
        } else {
            System.out.println("登录失败！");
        }
    }

    private static Student login() {
        System.out.println("请输入学号：");
        Scanner scanner = new Scanner(System.in);
        String id = scanner.nextLine();
        System.out.println("请输入密码：");
        String password = scanner.nextLine();
        for (Student student : studentList) {
            if (student.getId().equals(id) && student.getPassword().equals(password)) {
                return student;
            }
        }
        return null;
    }

    private static void applyForLeave(Student student) {
        System.out.println("请输入请假开始时间：");
        Scanner scanner = new Scanner(System.in);
        String startTime = scanner.nextLine();
        System.out.println("请输入请假结束时间：");
        String endTime = scanner.nextLine();
        System.out.println("请输入请假原因：");
        String reason = scanner.nextLine();
        LeaveRecord leaveRecord = new LeaveRecord(startTime, endTime, reason);
        student.getLeaveRecords().add(leaveRecord);
        System.out.println("请假申请已提交！");
    }

    private static void viewLeaveRecords(Student student) {
        System.out.println("请假记录如下：");
        List<LeaveRecord> leaveRecords = student.getLeaveRecords();
        for (LeaveRecord leaveRecord : leaveRecords) {
            System.out.println("开始时间：" + leaveRecord.getStartTime());
            System.out.println("结束时间：" + leaveRecord.getEndTime());
            System.out.println("请假原因：" + leaveRecord.getReason());
            System.out.println("审批状态：" + leaveRecord.getStatus());
            System.out.println("--------------------");
        }
    }
}

class Student {
    private String id;
    private String password;
    private String name;
    private List<LeaveRecord> leaveRecords = new ArrayList<>();

    public Student(String id, String password, String name) {
        this.id = id;
        this.password = password;
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public String getPassword() {
        return password;
    }

    public String getName() {
        return name;
    }

    public List<LeaveRecord> getLeaveRecords() {
        return leaveRecords;
    }
}

class LeaveRecord {
    private String startTime;
    private String endTime;
    private String reason;
    private String status = "待审批";

    public LeaveRecord(String startTime, String endTime, String reason) {
        this.startTime = startTime;
        this.endTime = endTime;
        this.reason = reason;
    }

    public String getStartTime() {
        return startTime;
    }

    public String getEndTime() {
        return endTime;
    }

    public String getReason() {
        return reason;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }
}

这段代码实现了一个简单的请假系统学生端，包含登录、请假和查看请假记录的功能。在这个示例中，学生信息和请假记录都是存储在内存中的，实际的请假系统需要将数据存储在数据库或文件中以便持久化。同时，还需要对输入进行验证和过滤，确保系统的安全性。