Version 1.0

Lab.java

+/**
+ * This in a class which represents a lab.
+ * this class includes a number of students
+ * in itself which are given to the defined
+ * lab by a method and sores them in a neat way
+ * @author Reza Farahbakhsh
+ * @since 12/3/2021
+ * @version 1.0
+ */
+public class Lab {
+    private int avg = 0;
+    private String day;
+    private int capacity;
+    private int currentSize;
+    private Student[] students = new Student[capacity];
+    public Lab(int cap, String d) {
+        capacity = cap;
+        day = d;
+    }
+
+    /**
+     * method to update the maximum capacity of lab after defining it
+     */
+    public void updateSize() {
+        students = new Student[capacity];
+    }
+
+    /**
+     * a method to add the given student to the defined lab
+     * @param std
+     */
+    public void enrollStudent(Student std) {
+        if (currentSize < capacity) {
+            students[currentSize] = std;
+            currentSize++;
+        } else {
+            System.out.println("Lab is full!!!");
+        }
+    }
+
+    /**
+     * a method to print the stored information in neat way
+     */
+    public void print() {
+        for(int i = 0; i < currentSize; i++) {
+            String name = students[i].getFirstName();
+            String id = students[i].getId();
+            int grade = students[i].getGrade();
+            System.out.println("std first name: " + name
+                             + " std id:" + id
+                             + " std grade:"+ grade);
+        }
+        System.out.println("Grade average: " + avg);
+    }
+
+    /**
+     * method to get the current size of students from across other classes
+     * @return currentSize
+     */
+    public int getSize() {
+        return currentSize;
+    }
+
+    /**
+     * method to get the array of all the students from across other classes
+     * @return students
+     */
+    public Student[] getStudents() {
+        return students;
+    }
+
+    /**
+     * method to replace an array of students from other classes to this class
+     * @param std
+     */
+    public void setStudents(Student[] std) {
+        students = std;
+    }
+
+    /**
+     * method to get the average of students' grades from across other classes
+     * @return avg
+     */
+    public int getAvg() {
+        return avg;
+    }
+
+    /**
+     * method to calculate the average of grades
+     */
+    public void calculateAvg() {
+        for(int i = 0; i < currentSize; i++) {
+            avg += students[i].getGrade();
+        }
+        avg /= currentSize;
+    }
+
+    /**
+     * method to know what day the lab is starting by other classes
+     * @return day
+     */
+    public String getDay() {
+        return day;
+    }
+
+    /**
+     * method to change what day lab starts by other classes
+     * @param d
+     */
+    public void setDay(String d) {
+        day = d;
+    }
+
+    /**
+     * method to get the maximum capacity of students in a lab by other classes
+     * @return capacity
+     */
+    public int getCapacity() {
+        return capacity;
+    }
+
+    /**
+     * method to change the maximum capacity of students by other classes
+     * @param cap
+     */
+    public void setCapacity(int cap) {
+        capacity = cap;
+    }
+}

Run.java

+/**
+ * Class to run the program
+ * @author Reza Farahbakhsh
+ * @since 12/3/2021
+ * @version 1.0
+ */
+public class Run {
+    /**
+     * main method to run the program
+     * @param args
+     */
+    public static void main(String[] args) {
+        Student std1 = new Student("Ehsan","Edalat", "9031066");
+        Student std2 = new Student("Seyed", "Ahmadpanah", "9031806");
+        Student std3 = new Student("Ahmad", "Asadi", "9031054");
+        Student std4 = new Student("Reza", "Farah", "9931074");
+        Student std5 = new Student("Saman", "Hoseini", "9731012");
+        std1.print();
+        std1.setGrade(15);
+        std1.print();
+        std2.print();
+        std2.setGrade(11);
+        std2.print();
+        std3.print();
+        std3.setFirstName("HamidReza");
+        std3.setGrade(12);
+        std3.print();
+        std4.setGrade(18);
+        std5.setGrade(20);
+        Lab lab1 = new Lab(30, "Saturday");
+        lab1.updateSize();
+        Lab lab2 = new Lab(25, "Sunday");
+        lab2.updateSize();
+        lab1.enrollStudent(std1);
+        lab1.enrollStudent(std2);
+        lab1.enrollStudent(std3);
+        lab2.enrollStudent(std4);
+        lab2.enrollStudent(std5);
+        lab1.calculateAvg();
+        lab2.calculateAvg();
+        lab1.print();
+        lab2.print();
+        Uni uni1 = new Uni("CE", 100);
+        uni1.updateSize();
+        uni1.enrollLab(lab1);
+        uni1.enrollLab(lab2);
+        uni1.print();
+    }
+}

Student.java

+/**
+ * The Student class represents a student in a student
+ administration system.
+ * It holds the student details relevant in our context.
+ *
+ * @author Reza Farahbakhsh
+ * @version 1.0
+ */
+public class Student {
+    // the student’s first name
+    private String firstName;
+
+    // the student’s last name
+    private String lastName;
+
+    // the student ID
+    private String id;
+
+    //the grade
+    private int grade;
+
+    /**
+     * get the first name of student
+     * @return firstName field
+     */
+    public String getFirstName() {
+        return firstName;
+    }
+    /**
+     * get the grade of student
+     */
+    public void setGrade(int newGrade) {
+        grade = newGrade;
+    }
+    /**
+     * @param fName set first name of a student
+     */
+    public void setFirstName(String fName) {
+        firstName = fName;
+    }
+    /**
+     * Print the student’s last name and ID number to the
+     * output terminal.
+     */
+    public void print() {
+        System.out.println(lastName + ", student ID: "
+                + id + ", grade: " + grade);
+    }
+    /**
+     * Get student grade
+     * @return Grd
+     */
+    public int getGrade() {
+        return grade;
+    }
+    /**
+     * Get student ID
+     * @return ID
+     */
+    public String getId() {
+        return id;
+    }
+    /**
+     * Create a new student with a given name and ID number.
+     *
+     * @param fName first name of student
+     * @param lName last name of student
+     * @param sID student ID
+     */
+    public Student(String fName, String lName, String sID){
+        firstName = fName;
+        lastName = lName;
+        id = sID;
+        grade = 0;
+    }
+}

Uni.java

+/**
+ * This is a class that represents a university
+ * which in this case is consisted of one or more labs
+ * that each have a number of students in them.
+ * @author Reza Frahabkhsh
+ * @since 12/3/2021
+ * @version 1.0
+ */
+public class Uni {
+    private String uniName;
+    private int Size;
+    private int current;
+    private Lab[] labs = new Lab[Size];
+    public Uni(String name, int size) {
+        uniName = name;
+        Size = size;
+    }
+
+    /**
+     * a method to add a given lab to the uni class
+     * @param lab
+     */
+    public void enrollLab(Lab lab) {
+        labs[current++] = lab;
+    }
+
+    /**
+     * a method to update the size of the class after defining it
+     */
+    public void updateSize() {
+        labs = new Lab[Size];
+    }
+
+    /**
+     * a method to print all the information stored in the class
+     */
+    public void print() {
+        System.out.println("----------------------------------------------------------------------------");
+        System.out.println("Uni Name: " + uniName);
+        for(int i = 0; i < current; i++) {
+            int labSize = labs[i].getSize();
+            int labCap = labs[i].getCapacity();
+            labs[i].calculateAvg();
+            int avg = labs[i].getAvg();
+            String day = labs[i].getDay();
+            System.out.println("Lab " + (i + 1) + ": Cap: " + labCap + " Day: " + day);
+            for(int j = 0; j < labSize; j++) {
+                Student[] sdt = labs[i].getStudents();
+                String name = sdt[j].getFirstName();
+                String id = sdt[j].getId();
+                int grade = sdt[j].getGrade();
+                System.out.println("std first name: " + name
+                        + " std id:" + id
+                        + " std grade:"+ grade);
+            }
+            System.out.println("Lab AVG: " + avg);
+            System.out.println("----------------------------------------------------------------------------");
+        }
+    }
+}