How to implement a simple student leave approval system in Java?

Java is a programming language widely used in software development. In actual software development, we often need to build various systems to meet specific needs. This article will discuss how to use Java to build a simple student leave approval system.

First of all, let us clarify the needs of the student leave approval system. The system should have the following functions:

1. Students can submit a leave application, including the start date, end date and reason for the leave.
2. Teachers can review and approve or reject students' leave requests.
3. Students can check the approval status of their leave application.
4. Students can cancel unapproved leave applications.

Next, we can consider how to use Java to implement this system. First, we need to define some key data structures and classes.

1. Student category: Contains basic information of students, such as student number, name, etc.
2. Leave application category: Contains information about leave application, such as start date, end date, reason for leave, etc.
3. Teacher category: Contains basic information of teachers, such as job number, name, etc.
4. Approval category: Contains approval information, such as approval status, approval opinions, etc.

Next, we can define a main class to implement the main functions of the system. The following is a simple pseudocode implementation:

public class LeaveApprovalSystem {
    // 定义学生列表，保存已注册的学生信息
    List<Student> studentList;
    // 定义教师列表，保存已注册的教师信息
    List<Teacher> teacherList;
    // 定义请假申请列表，保存已提交的请假申请
    List<LeaveApplication> leaveApplicationList;
    
    // 学生注册功能
    public void registerStudent(Student student) {
        studentList.add(student);
    }
    
    // 教师注册功能
    public void registerTeacher(Teacher teacher) {
        teacherList.add(teacher);
    }
    
    // 学生提交请假申请功能
    public void submitLeaveApplication(Student student, LeaveApplication leaveApplication) {
        leaveApplicationList.add(leaveApplication);
    }
    
    // 教师审批请假申请功能
    public void approveLeaveApplication(Teacher teacher, LeaveApplication leaveApplication) {
        leaveApplication.setApprovalStatus("Approved");
    }
    
    // 教师拒绝请假申请功能
    public void rejectLeaveApplication(Teacher teacher, LeaveApplication leaveApplication) {
        leaveApplication.setApprovalStatus("Rejected");
    }
    
    // 学生取消请假申请功能
    public void cancelLeaveApplication(Student student, LeaveApplication leaveApplication) {
        leaveApplicationList.remove(leaveApplication);
    }
    
    // 学生查看请假申请状态功能
    public String getLeaveApplicationStatus(Student student, LeaveApplication leaveApplication) {
        return leaveApplication.getApprovalStatus();
    }
}

public class Main {
    public static void main(String[] args) {
        LeaveApprovalSystem system = new LeaveApprovalSystem();
        Student student = new Student("001", "张三");
        Teacher teacher = new Teacher("1001", "李老师");
        LeaveApplication leaveApplication = new LeaveApplication("2021-01-01", "2021-01-05", "家里有事情");
        
        system.registerStudent(student);
        system.registerTeacher(teacher);
        system.submitLeaveApplication(student, leaveApplication);
        
        system.approveLeaveApplication(teacher, leaveApplication);
        
        String status = system.getLeaveApplicationStatus(student, leaveApplication);
        System.out.println("请假申请状态：" + status);
    }
}

The above is a simple Java implementation of a student leave approval system. By defining relevant classes and methods, we can implement student registration, leave application, teacher approval functions, and query the status of leave application.

Of course, this is just a simple example, and the actual leave approval system may have more functions and complexity. But through this example, we can understand how to use Java to build a simple student leave approval system, providing some ideas and guidance for actual development.

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