education system update

EducationSystem.java

@@ -1,62 +1,155 @@
-import java.util.ArrayList;
-interface EducationalInstitution {
-    String displayInfo();
-}
-
-abstract class University implements EducationalInstitution {
-    public String name;
-    public int studentCount;
-    public double tuitionFee;
-    public ArrayList<Student> students;
-
-    public boolean transferStudent(Student student, University university) {
-    }
-
-    University(String name, double tuitionFee) {
-    }
-}
-
-class Student implements EducationalInstitution {
-    private String name;
-    public University university;
-    private double balance;
-
-    public Student(String name, double balance, University university) {
-    }
-
-    @Override
-    public String displayInfo() {
-    }
-
-    public String getName() {
-    }
-
-    public void setName(String name) {
-    }
-
-    public University getUniversity() {
-    }
-
-    public double getBalance() {
-    }
-}
-
-class SbuUniversity extends University {
-    public SbuUniversity(String name, double tuitionFee) {
-    }
-
-    @Override
-    public String displayInfo() {
-    }
-}
-
-class SutUniversity extends University {
-
-    SutUniversity(String name, double tuitionFee) {
-    }
-
-    @Override
-    public String displayInfo() {
-
-    }
-}
+import java.util.ArrayList;
+import java.util.Random;
+
+// An interface that lets us tell if an educational place shows its info properly
+interface EducationalInstitution {
+    // Every educational place needs to show its details somehow
+    String displayInfo();
+}
+
+// An abstract class for a university, which is a kind of educational place
+abstract class University implements EducationalInstitution {
+    // Stuff we need to know about the university
+    public String uniName;
+    public int numStudents;
+    public double annualFee;
+    public ArrayList<Student> enrolledStudents;
+
+    // Helps move a student from one university to another
+    public boolean transferStudent(Student student, University destUni) {
+        if (enrolledStudents.contains(student)) { // Check if the student is here
+            enrolledStudents.remove(student); // Kick 'em outta here
+            numStudents--; // One less student
+            destUni.enrolledStudents.add(student); // Welcome them over there
+            destUni.numStudents++; // One more student over there
+            return true; // Transfer went smoothly
+        }
+        return false; // Something went wrong
+    }
+
+    // Makes a new university
+    University(String uniName, double annualFee) {
+        this.uniName = uniName;
+        this.annualFee = annualFee;
+        enrolledStudents = new ArrayList<>(); // Starting empty
+        numStudents = 0; // No students yet
+    }
+}
+
+// Represents a student who goes to a university
+class Student implements EducationalInstitution {
+    // Stuff about the student
+    private String studentName;
+    public University attendingUni; // Where the student goes to school
+    private double cashOnHand; // How much money the student has
+
+    // Makes a new student
+    public Student(String studentName, double cashOnHand, University attendingUni) {
+        this.studentName = studentName;
+        this.cashOnHand = cashOnHand;
+        this.attendingUni = attendingUni;
+
+        // Check if the student can afford the university
+        if (cashOnHand >= attendingUni.annualFee) {
+            attendingUni.enrolledStudents.add(this); // Add 'em to the list
+            attendingUni.numStudents++; // One more student
+            cashOnHand -= attendingUni.annualFee; // Pay the fees
+        } else {
+            System.out.println("Not enough money."); // Can't afford it
+        }
+    }
+
+    // Shows the student's info in a nice format
+    @Override
+    public String displayInfo() {
+        if (attendingUni == null) { // Not going to any university
+            return "Name: " + studentName + "\nGoing to School: None\nMoney Left: " + cashOnHand;
+        } else {
+            return "Name: " + studentName + "\nGoing to School: " + attendingUni.uniName + "\nMoney Left: "
+                    + cashOnHand;
+        }
+    }
+
+    // Gets the student's info
+    public String getStudentName() {
+        return studentName;
+    }
+
+    public University getSchool() {
+        return attendingUni;
+    }
+
+    public double getMoneyLeft() {
+        return cashOnHand;
+    }
+}
+
+// Specific kinds of universities
+class SbuUniversity extends University {
+    public SbuUniversity(String uniName, double annualFee) {
+        super(uniName, annualFee);
+    }
+
+    @Override
+    public String displayInfo() {
+        return "SBU University\nAnnual Fee: " + String.format("%.1f", annualFee) + "\nNumber of Students: "
+                + numStudents;
+    }
+}
+
+class SutUniversity extends University {
+    public SutUniversity(String uniName, double annualFee) {
+        super(uniName, annualFee);
+    }
+
+    @Override
+    public String displayInfo() {
+        return "SUT University\nAnnual Fee: " + String.format("%.1f", annualFee) + "\nNumber of Students: "
+                + numStudents;
+    }
+}
+
+// Main class to see everything in action
+
+class EduSystem {
+    public static void main(String[] args) {
+        // Let's start by picking random names and prices for our universities
+        Random rand = new Random();
+        String sbuName = "Shahid Beheshti University";
+        double sbuPrice = 1300.0 + rand.nextDouble() * 500; // Between 1500 and 2000
+        String sutName = "Sharif University of Technology";
+        double sutPrice = 2200.0 + rand.nextDouble() * 500; // Between 2000 and 2500
+
+        // Now, let's enroll some students with varying amounts of cash
+        String s1Name = "Mehdi";
+        double s1Cash = 3000.0 + rand.nextDouble() * 2000; // Between 3000 and 5000
+        String s2Name = "Sara";
+        double s2Cash = 1000.0 + rand.nextDouble() * 1000; // Between 1000 and 2000
+
+        // Displaying the initial setup
+        System.out.println("Welcome to our academic world!");
+        System.out.println("Our universities:");
+        System.out.println("SBU University - Annual Fee: " + sbuPrice);
+        System.out.println("SUT University - Annual Fee: " + sutPrice);
+
+        // Enrolling students
+        System.out.println("\nEnrolling students...");
+        Student s1 = new Student(s1Name, s1Cash, sbuPrice <= s1Cash ? new SbuUniversity(sbuName, sbuPrice) : null);
+        Student s2 = new Student(s2Name, s2Cash, sutPrice <= s2Cash ? new SutUniversity(sutName, sutPrice) : null);
+
+        // Displaying student info
+        System.out.println("\nMeet our students:");
+        System.out.println(s1.displayInfo());
+        System.out.println(s2.displayInfo());
+
+        // transfer a student
+        boolean didTransfer = s1.getSchool() != null && s1.getSchool().transferStudent(s1, s2.getSchool());
+        if (didTransfer) {
+            System.out.println("\nWow, " + s1Name + " decided to switch to " + s2Name + "'s university!");
+            System.out.println(s1.displayInfo());
+            System.out.println(s2.displayInfo());
+        } else {
+            System.out.println("\nLooks like " + s1Name + " couldn't make the switch.");
+        }
+    }
+}