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java
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package student.task;

public class MgmtAppTask {
    public static void main(String[] args) {
        StudentDatabase database = new StudentDatabase();
        // Demonstrate adding, updating, and listing students
        Student student1 = new Student("Alice", 20, "Computer Science");
        Student student2 = new Student("Bob", 21, "Engineering");
        database.addStudent(student1);
        database.addStudent(student2);

        Student retrievedStudent = database.getStudent(1);
        retrievedStudent.setName("Alex");
        database.updateStudent(retrievedStudent);

        database.listStudents();
        database.deleteStudent(1);
        database.listStudents();
    }

}

class StudentDatabase {

    public void addStudent(Student student) {

    }

    public Student getStudent(int i) {
        return null;
    }

    public void updateStudent(Student retrievedStudent) {

    }

    public void listStudents() {
        // should be in readable form for humans :)
    }

    public void deleteStudent(int i) {

    }

    // Implement  methods: addStudent, getStudent, updateStudent, deleteStudent, listStudents
}

class Student {
    private int id;
    private String name;
    private int age;
    private String course;

    public Student(String name, int age, String course) {
        this.name = name;
        this.age = age;
        this.course = course;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getCourse() {
        return course;
    }

    public void setCourse(String course) {
        this.course = course;
    }

}