Yana P

task-1/com/hyfacademy/Main.java

@@ -0,0 +1,14 @@
+package com.hyfacademy;
+
+import com.hyfacademy.service.GradeService;
+
+
+
+public class Main {
+    public static void main(String[] args) {
+GradeService gradeService = new GradeService();
+gradeService.run();
+
+    }
+}
+

task-1/com/hyfacademy/model/Student.java

@@ -0,0 +1,63 @@
+package com.hyfacademy.model;
+
+
+import com.hyfacademy.util.GradeUtils;
+
+public class Student{
+    private String name;
+    private String studentId;
+    private int[] grades;
+
+    private static int totalStudents = 0;
+
+
+    public Student(String name, String studentId){
+        this.name = name;
+        this.studentId = studentId;
+        this.grades = new int[]{0, 0, 0, 0, 0};
+        totalStudents ++;
+    }
+
+    public String getName(){return name;}
+
+    public String getStudentId(){
+        return studentId;
+    }
+
+    public int[] getGrades(){
+        return grades;
+    }
+
+    public double getAverage(){
+        return GradeUtils.calculateAverage(grades);
+    }
+
+    public String getStatus(){
+        return GradeUtils.isPassing(getAverage()) ? "PASS" : "FAIL";
+    }
+
+    public void setGrade(int moduleIndex, int grade){
+        if(moduleIndex<0 || moduleIndex > 4){
+            System.out.println("Module index must be between 0 and 4");
+            return;
+        }
+        if(grade < 0 || grade > 100){
+            System.out.println("Grade must be between 0 and 100");
+            return;
+        }
+        grades[moduleIndex] = grade;
+    }
+
+    public static int getTotalStudents(){
+        return totalStudents;
+    }
+
+
+    @Override
+    public String toString(){
+
+        return String.format("[%s] %s — Avg: %.2f — %s", studentId, name, getAverage(), getStatus());
+    }
+
+
+}

task-1/com/hyfacademy/service/GradeService.java

@@ -0,0 +1,264 @@
+package com.hyfacademy.service;
+
+
+import com.hyfacademy.model.Student;
+import com.hyfacademy.util.GradeUtils;
+
+import java.util.Scanner;
+
+public class GradeService {
+    public static final int MAX_STUDENTS = 20;
+    private Scanner scanner = new Scanner(System.in);
+    private int studentCount = 0;
+    private Student[] students = new Student[MAX_STUDENTS];
+
+    public void addStudent() {
+        if (studentCount == MAX_STUDENTS) {
+            System.out.println("Sorry, but a group is full(max 20 students)");
+            return;
+        }
+
+        String name;
+
+        while (true) {
+            System.out.print("Enter new student name: ");
+            name = scanner.nextLine().trim();
+
+            if (name.isEmpty()) {
+                System.out.println("Name cannot be empty. Please enter a valid name");
+                continue;
+            }
+
+            if (name.matches(".*\\d.*")) {
+                System.out.println("Name cannot contain numbers.");
+                continue;
+            }
+
+            break;
+        }
+
+        String studentId = String.format("HYF-%03d", studentCount + 1);
+
+        Student newStudent = new Student(name, studentId);
+        students[studentCount] = newStudent;
+        studentCount++;
+
+        System.out.println("Student added: " + newStudent);
+    }
+
+    public void enterGrades() {
+        System.out.print("Enter student ID: ");
+        String studentId = scanner.nextLine();
+        Student student = findStudentById(studentId);
+
+        if (student == null) {
+            System.out.println("Student not found");
+            return;
+        }
+
+        for (int i = 0; i < GradeUtils.MODULE_COUNT; i++) {
+            while (true) {
+                System.out.print("Enter grade for " + GradeUtils.MODULE_NAMES[i] + ": ");
+
+                if (!scanner.hasNextInt()) {
+                    System.out.println("Grade must be a number");
+                    scanner.nextLine();
+                    continue;
+                }
+                int grade = scanner.nextInt();
+                scanner.nextLine();
+
+                if (grade < 0 || grade > 100) {
+                    System.out.println("Please enter a number from 0 to 100");
+                    continue;
+                }
+
+                student.setGrade(i, grade);
+                break;
+            }
+        }
+        System.out.println("Grades updated for " + student.getName());
+    }
+
+    private Student findStudentById(String id) {
+        for (int i = 0; i < studentCount; i++) {
+            if (students[i].getStudentId().equalsIgnoreCase(id)) {
+                return students[i];
+            }
+        }
+        return null;
+    }
+
+    public void viewAllStudents() {
+
+        if (studentCount == 0) {
+            System.out.println("You don't have any students");
+            return;
+        }
+
+        int passing = 0;
+        int failing = 0;
+
+        System.out.println("══════════════════════════════════════════════════════════════");
+        System.out.printf("%-10s %-20s %-10s %-8s %-8s%n", "ID", "NAME", "AVERAGE", "GRADE", "STATUS");
+        System.out.println("══════════════════════════════════════════════════════════════");
+
+        for (int i = 0; i < studentCount - 1; i++) {
+            for (int j = 0; j < studentCount - i - 1; j++) {
+                if (students[j].getAverage() < students[j + 1].getAverage()) {
+                    Student lessAverage = students[j];
+                    students[j] = students[j + 1];
+                    students[j + 1] = lessAverage;
+                }
+            }
+        }
+
+        for (int i = 0; i < studentCount; i++) {
+
+            Student student = students[i];
+            double average = student.getAverage();
+            String grade = GradeUtils.getLetterGrade(average);
+            String status = student.getStatus();
+
+            if (status.equals("PASS")) {
+                passing++;
+            } else {
+                failing++;
+            }
+
+            System.out.printf("%-10s %-20s %-10.2f %-8s %-8s%n", student.getStudentId(), student.getName(), average, grade, status);
+        }
+        System.out.println("══════════════════════════════════════════════════════════════");
+        System.out.printf("Total students: %d   Passing: %d   Failing: %d%n", studentCount, passing, failing);
+        System.out.println("══════════════════════════════════════════════════════════════");
+
+    }
+
+    public void viewStudentsReport() {
+
+        System.out.print("Enter student ID: ");
+        String studentId = scanner.nextLine();
+
+        Student student = findStudentById(studentId);
+        if (student == null) {
+            System.out.println("Student not found.");
+            return;
+        }
+
+        double average = student.getAverage();
+        String letter = GradeUtils.getLetterGrade(average);
+        String status = student.getStatus().equals("PASS") ? "✓ PASS" : "✗ FAIL";
+
+
+        System.out.println("══════════════════════════════════════");
+        System.out.println("STUDENT REPORT");
+        System.out.println("══════════════════════════════════════");
+        System.out.printf("%-10s : %s%n", "ID", studentId);
+        System.out.printf("%-10s : %s%n", "Name", student.getName());
+        System.out.println("──────────────────────────────────────");
+        System.out.println("MODULE GRADES");
+        System.out.println("──────────────────────────────────────");
+
+        for (int i = 0; i < GradeUtils.MODULE_COUNT; i++) {
+            String module = GradeUtils.MODULE_NAMES[i];
+            int moduleGrate = student.getGrades()[i];
+            String moduleStatus = GradeUtils.isModulePassing(moduleGrate) ? "PASS" : "FAIL";
+
+            System.out.printf("%-20s : %-5d %-5s%n", module, moduleGrate, moduleStatus);
+        }
+
+        System.out.println("──────────────────────────────────────");
+        System.out.printf("%-10s : %.2f%n", "Average", average);
+        System.out.printf("%-10s : %s%n", "Grade", letter);
+        System.out.printf("%-10s : %s%n", "Status", status);
+        System.out.println("══════════════════════════════════════");
+
+    }
+
+    public void viewClassStatistic() {
+        if(studentCount == 0){
+            System.out.println("For run statistic you need at least one student");
+            return;
+        }
+
+        System.out.println("══════════════════════════════════════════════════════");
+        System.out.println("                 CLASS GRADES STATISTICS              ");
+        System.out.println("══════════════════════════════════════════════════════");
+        System.out.printf("%-24s %-10s %-10s %-10s%n", "CLASS", "HIGHEST ", "LOWEST", "AVERAGE");
+        System.out.println("══════════════════════════════════════════════════════");
+
+        for (int i = 0; i < GradeUtils.MODULE_COUNT; i++) {
+            String module = GradeUtils.MODULE_NAMES[i];
+            int highest = 0;
+            int lowest = 100;
+            int sum = 0;
+
+            for (int j = 0; j < studentCount; j++) {
+                int grade = students[j].getGrades()[i];
+
+                if (grade > highest) {
+                    highest = grade;
+                }
+                if (grade < lowest) {
+                    lowest = grade;
+                }
+
+                sum += grade;
+            }
+
+            double average = (double) sum / studentCount;
+
+            System.out.printf("%-24s %-10d %-10d %-10.2f%n", module, highest, lowest, average);
+
+
+        }
+        System.out.println("══════════════════════════════════════════════════════");
+    }
+
+    public void run() {
+        while (true) {
+            System.out.println("╔══════════════════════════════════════╗");
+            System.out.println("║         HYF ACADEMY — GRADE MGR      ║");
+            System.out.println("╚══════════════════════════════════════╝");
+            System.out.println("1. Add student");
+            System.out.println("2. Enter grades");
+            System.out.println("3. View all students");
+            System.out.println("4. View student report");
+            System.out.println("5. Class statistic");
+            System.out.println("6. Exit");
+
+            System.out.println("════════════════════════════════════════");
+            System.out.print("Choose an option: ");
+            if (!scanner.hasNextInt()) {
+                System.out.println("Please enter a valid number.");
+                scanner.nextLine();
+                continue;
+            }
+
+            int choice = scanner.nextInt();
+            scanner.nextLine();
+
+            if (choice < 1 || choice > 6) {
+                System.out.println("Please enter a number from 1 to 6.");
+                continue;
+            }
+
+            switch (choice) {
+                case 1 -> addStudent();
+                case 2 -> enterGrades();
+                case 3 -> viewAllStudents();
+                case 4 -> viewStudentsReport();
+                case 5 -> viewClassStatistic();
+                case 6 -> {
+                    System.out.println("Goodbye!");
+                    return;
+                }
+            }
+
+
+        }
+
+    }
+
+
+}