First Commit

Lab2/src/main/java/org/lumijiez/Main.java

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+package org.lumijiez;
+
+import org.lumijiez.base.Grade;
+import org.lumijiez.base.NameSurnameGroup;
+import org.lumijiez.data.DataDeserializer;
+import org.lumijiez.data.DataSerializer;
+import org.lumijiez.managers.Manager;
+
+import java.util.Scanner;
+
+public class Main {
+    public static NameSurnameGroup readNSG() {
+        String name = sc.nextLine();
+        String surname = sc.nextLine();
+        String group = sc.nextLine();
+        return new NameSurnameGroup(name, surname, group);
+    }
+    public static Scanner sc = new Scanner(System.in);
+    public static void main(String[] args) {
+        Manager studentManager = DataDeserializer.deserialize();
+
+        boolean exit = false;
+        while (!exit) {
+            System.out.println("===== Student Management System =====");
+            System.out.println("1. Show Students");
+            System.out.println("2. Show Groups");
+            System.out.println("3. Show Grades of a Student");
+            System.out.println("4. Add Grade to Student");
+            System.out.println("5. Add Student");
+            System.out.println("6. Remove student");
+            System.out.println("7. Exit and save");
+            System.out.print("Enter your choice: ");
+
+            int choice = sc.nextInt();
+            sc.nextLine();
+
+            switch (choice) {
+                case 1 -> studentManager.printStudents();
+                case 2 -> studentManager.printGroups();
+                case 3 -> studentManager.printGrades(readNSG());
+                case 4 -> studentManager.addGrade(readNSG(), new Grade(sc.nextLine(), sc.nextInt()));
+                case 5 -> studentManager.addStudent(readNSG());
+                case 6 -> studentManager.removeStudent(readNSG());
+                case 7 -> {
+                    DataSerializer.serialize(studentManager);
+                    exit = true;
+                }
+                default -> System.out.println("Invalid choice. Please try again.");
+            }
+
+            if (!exit) {
+                System.out.println("Press Enter to continue...");
+                sc.nextLine();
+            }
+        }
+
+        System.out.println("Goodbye!");
+    }
+}

Lab2/src/main/java/org/lumijiez/base/Grade.java

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+package org.lumijiez.base;
+
+import java.io.Serializable;
+
+public class Grade implements Serializable {
+    private final String subject;
+    private final int grade;
+
+    public Grade(String subject, int grade) {
+        this.subject = subject;
+        this.grade = grade;
+    }
+
+    public String getSubject() {
+        return subject;
+    }
+
+    public int getGrade() {
+        return grade;
+    }
+
+}

Lab2/src/main/java/org/lumijiez/base/Group.java

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+package org.lumijiez.base;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Group implements Serializable {
+    private final String name;
+    private final List<Student> students = new ArrayList<>();
+
+    public Group(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void addStudent(Student st) {
+        students.add(st);
+    }
+    public void deleteStudent(Student st) {
+        students.remove(st);
+    }
+
+    public List<Student> getStudents() {
+        return students;
+    }
+
+    public Student getStudent(String name, String surname) {
+        for (Student student : students) {
+            if (student.getName().equals(name) && student.getSurname().equals(surname)) {
+                return student;
+            }
+        }
+        return null;
+    }
+}

Lab2/src/main/java/org/lumijiez/base/NameSurnameGroup.java

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+package org.lumijiez.base;
+
+public class NameSurnameGroup {
+    private final String name;
+    private final String surname;
+    private final String groupName;
+
+    public NameSurnameGroup(String name, String surname, String groupName) {
+        this.name = name;
+        this.surname = surname;
+        this.groupName = groupName;
+    }
+
+    public String name() {
+        return name;
+    }
+
+    public String surname() {
+        return surname;
+    }
+
+    public String group() {
+        return groupName;
+    }
+}

Lab2/src/main/java/org/lumijiez/base/Student.java

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+package org.lumijiez.base;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Student implements Serializable {
+    private final String name;
+    private final String surname;
+    private final String fullname;
+    private Group group;
+    private final List<Grade> grades = new ArrayList<>();
+
+    public Student(String name, String surname, Group group) {
+        this.name = name;
+        this.surname = surname;
+        this.fullname = name + " " + surname;
+        this.group = group;
+    }
+
+    public void setGroup(Group gr) {
+        this.group.deleteStudent(this);
+        this.group = gr;
+        gr.addStudent(this);
+    }
+
+    public List<Grade> getGrades() {
+        return grades;
+    }
+
+    public void addGrade(Grade grade) {
+        grades.add(grade);
+    }
+    public String getName() {
+        return name;
+    }
+
+    public String getSurname() {
+        return surname;
+    }
+
+    public String getFullname() {
+        return fullname;
+    }
+
+    public Group getGroup() {
+        return group;
+    }
+
+}

Lab2/src/main/java/org/lumijiez/data/DataDeserializer.java

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+package org.lumijiez.data;
+
+import org.lumijiez.managers.Manager;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+
+public class DataDeserializer {
+    public static Manager deserialize() {
+        File serializedFile = new File("manager.ser");
+        Manager manager = new Manager();
+        if (serializedFile.exists()) {
+            try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(serializedFile))) {
+                manager = (Manager) ois.readObject();
+                System.out.println("Manager object deserialized successfully.");
+            } catch (IOException | ClassNotFoundException e) {
+                e.printStackTrace();
+            }
+        } else {
+            System.out.println("Serialized file 'manager.ser' does not exist.");
+        }
+        return manager;
+    }
+
+}

Lab2/src/main/java/org/lumijiez/data/DataSerializer.java

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+package org.lumijiez.data;
+
+import org.lumijiez.managers.Manager;
+
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+
+public class DataSerializer {
+
+    public static void serialize(Manager manager) {
+        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("manager.ser"))) {
+            oos.writeObject(manager);
+            System.out.println("Manager object serialized successfully.");
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+}

Lab2/src/main/java/org/lumijiez/managers/GroupManager.java

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+package org.lumijiez.managers;
+
+import org.lumijiez.base.Group;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+public class GroupManager implements Serializable {
+    private final List<Group> groups = new ArrayList<>();
+
+    public Group getGroup(String groupName) {
+        for (Group group : groups) {
+            if (group.getName().equals(groupName)) {
+                return group;
+            }
+        }
+        Group newGroup = new Group(groupName);
+        groups.add(newGroup);
+        return newGroup;
+    }
+
+    public void addGroup(Group group) {
+        groups.add(group);
+    }
+
+    public List<Group> getGroups() {
+        return groups;
+    }
+
+    public void deleteGroup(Group group) {
+        groups.remove(group);
+    }
+
+}

Lab2/src/main/java/org/lumijiez/managers/Manager.java

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+package org.lumijiez.managers;
+
+import org.lumijiez.base.Grade;
+import org.lumijiez.base.Group;
+import org.lumijiez.base.NameSurnameGroup;
+import org.lumijiez.base.Student;
+
+import java.io.Serializable;
+
+public class Manager implements Serializable {
+    GroupManager groupManager;
+
+    public Manager() {
+        this.groupManager = new GroupManager();
+    }
+
+    public void addGroup(String groupName) {
+        groupManager.addGroup(new Group(groupName));
+    }
+
+    public void addStudent(NameSurnameGroup NSG) {
+        Group currentGroup = groupManager.getGroup(NSG.group());
+        currentGroup.addStudent(new Student(NSG.name(), NSG.surname(), currentGroup));
+    }
+
+    public void printStudents() {
+        for (Group group : groupManager.getGroups()) {
+            for (Student student : group.getStudents()) {
+                System.out.println(student.getFullname() + " " + student.getGroup().getName());
+            }
+        }
+    }
+
+    public void printGroups() {
+        for (Group group : groupManager.getGroups()) {
+            System.out.println(group.getName());
+        }
+    }
+
+    public void printGrades(NameSurnameGroup NSG) {
+        Student student = groupManager.getGroup(NSG.group()).getStudent(NSG.name(), NSG.surname());
+        for (Grade grade : student.getGrades()) {
+            System.out.println(grade.getSubject() + " " + grade.getGrade());
+        }
+    }
+
+    public void addGrade(NameSurnameGroup NSG, Grade grade) {
+        Student student = groupManager.getGroup(NSG.group()).getStudent(NSG.name(), NSG.surname());
+        student.addGrade(grade);
+    }
+
+    public void removeStudent(NameSurnameGroup NSG) {
+        Student student = groupManager.getGroup(NSG.group()).getStudent(NSG.name(), NSG.surname());
+        groupManager.getGroup(NSG.group()).deleteStudent(student);
+        if (student.getGroup().getStudents().isEmpty()) {
+            groupManager.getGroups().remove(student.getGroup());
+        }
+    }
+}