Implement Student Management System in Java

StudentManager.java

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+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Scanner;
+
+public class StudentManager {
+
+    public static void main(String[] args) {
+
+        HashSet<String> students = new HashSet<>();
+        Scanner sc = new Scanner(System.in);
+
+        int choice;
+
+        do {
+            System.out.println("\n===== Student Management System =====");
+            System.out.println("1. Add student name");
+            System.out.println("2. Display all student names");
+            System.out.println("3. Remove a student name");
+            System.out.println("4. Exit");
+            System.out.print("Enter your choice: ");
+
+            choice = sc.nextInt();
+            sc.nextLine(); // consume newline
+
+            switch (choice) {
+
+                case 1:
+                    System.out.print("Enter student name to add: ");
+                    String name = sc.nextLine();
+
+                    if (students.add(name)) {
+                        System.out.println("Student added successfully.");
+                    } else {
+                        System.out.println("Duplicate entry! Student already exists.");
+                    }
+                    break;
+
+                case 2:
+                    System.out.println("\n--- Student List ---");
+
+                    if (students.isEmpty()) {
+                        System.out.println("No students in the list.");
+                    } else {
+                        Iterator<String> it = students.iterator();
+                        while (it.hasNext()) {
+                            System.out.println(it.next());
+                        }
+                    }
+                    break;
+
+                case 3:
+                    System.out.print("Enter student name to remove: ");
+                    String removeName = sc.nextLine();
+
+                    if (students.remove(removeName)) {
+                        System.out.println("Student removed successfully.");
+                    } else {
+                        System.out.println("Student not found.");
+                    }
+                    break;
+
+                case 4:
+                    System.out.println("Exiting application. Goodbye!");
+                    break;
+
+                default:
+                    System.out.println("Invalid choice! Please try again.");
+            }
+
+        } while (choice != 4);
+
+        sc.close();
+    }
+}