└── student.java


/student.java:
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  1 | import java.util.*;
  2 | 
  3 | class Student {
  4 |     private int id;
  5 |     private String name;
  6 |     private String department;
  7 |     private double marks;
  8 | 
  9 |     public Student(int id, String name, String department, double marks) {
 10 |         this.id = id;
 11 |         this.name = name;
 12 |         this.department = department;
 13 |         this.marks = marks;
 14 |     }
 15 | 
 16 |     public int getId() {
 17 |         return id;
 18 |     }
 19 | 
 20 |     public void setName(String name) {
 21 |         this.name = name;
 22 |     }
 23 | 
 24 |     public void setDepartment(String department) {
 25 |         this.department = department;
 26 |     }
 27 | 
 28 |     public void setMarks(double marks) {
 29 |         this.marks = marks;
 30 |     }
 31 | 
 32 |     @Override
 33 |     public String toString() {
 34 |         return "ID: " + id +
 35 |                 ", Name: " + name +
 36 |                 ", Dept: " + department +
 37 |                 ", Marks: " + marks;
 38 |     }
 39 | }
 40 | 
 41 | public class StudentManagementSystem {
 42 | 
 43 |     private static final ArrayList<Student> students = new ArrayList<>();
 44 |     private static final Scanner sc = new Scanner(System.in);
 45 | 
 46 |     public static void main(String[] args) {
 47 | 
 48 |         while (true) {
 49 |             System.out.println("\n===== Student Management System =====");
 50 |             System.out.println("1. Add Student");
 51 |             System.out.println("2. View Students");
 52 |             System.out.println("3. Search Student");
 53 |             System.out.println("4. Update Student");
 54 |             System.out.println("5. Delete Student");
 55 |             System.out.println("6. Exit");
 56 | 
 57 |             System.out.print("Enter choice: ");
 58 |             int choice = sc.nextInt();
 59 | 
 60 |             switch (choice) {
 61 |                 case 1 -> addStudent();
 62 |                 case 2 -> viewStudents();
 63 |                 case 3 -> searchStudent();
 64 |                 case 4 -> updateStudent();
 65 |                 case 5 -> deleteStudent();
 66 |                 case 6 -> {
 67 |                     System.out.println("Exiting program...");
 68 |                     return;
 69 |                 }
 70 |                 default -> System.out.println("Invalid choice! Try again.");
 71 |             }
 72 |         }
 73 |     }
 74 | 
 75 |     private static void addStudent() {
 76 |         System.out.print("Enter ID: ");
 77 |         int id = sc.nextInt();
 78 |         sc.nextLine();
 79 | 
 80 |         System.out.print("Enter Name: ");
 81 |         String name = sc.nextLine();
 82 | 
 83 |         System.out.print("Enter Department: ");
 84 |         String dept = sc.nextLine();
 85 | 
 86 |         System.out.print("Enter Marks: ");
 87 |         double marks = sc.nextDouble();
 88 | 
 89 |         students.add(new Student(id, name, dept, marks));
 90 |         System.out.println("Student added successfully!");
 91 |     }
 92 | 
 93 |     private static void viewStudents() {
 94 |         if (students.isEmpty()) {
 95 |             System.out.println("No students available!");
 96 |             return;
 97 |         }
 98 | 
 99 |         System.out.println("\n--- Student List ---");
100 |         for (Student s : students) {
101 |             System.out.println(s);
102 |         }
103 |     }
104 | 
105 |     private static void searchStudent() {
106 |         System.out.print("Enter student ID to search: ");
107 |         int id = sc.nextInt();
108 | 
109 |         for (Student s : students) {
110 |             if (s.getId() == id) {
111 |                 System.out.println("Student Found: " + s);
112 |                 return;
113 |             }
114 |         }
115 | 
116 |         System.out.println("Student not found!");
117 |     }
118 | 
119 |     private static void updateStudent() {
120 |         System.out.print("Enter student ID to update: ");
121 |         int id = sc.nextInt();
122 |         sc.nextLine();
123 | 
124 |         for (Student s : students) {
125 |             if (s.getId() == id) {
126 |                 System.out.print("Enter new name: ");
127 |                 s.setName(sc.nextLine());
128 | 
129 |                 System.out.print("Enter new department: ");
130 |                 s.setDepartment(sc.nextLine());
131 | 
132 |                 System.out.print("Enter new marks: ");
133 |                 s.setMarks(sc.nextDouble());
134 | 
135 |                 System.out.println("Student updated successfully!");
136 |                 return;
137 |             }
138 |         }
139 | 
140 |         System.out.println("Student not found!");
141 |     }
142 | 
143 |     private static void deleteStudent() {
144 |         System.out.print("Enter student ID to delete: ");
145 |         int id = sc.nextInt();
146 | 
147 |         Iterator<Student> it = students.iterator();
148 | 
149 |         while (it.hasNext()) {
150 |             if (it.next().getId() == id) {
151 |                 it.remove();
152 |                 System.out.println("Student deleted successfully!");
153 |                 return;
154 |             }
155 |         }
156 | 
157 |         System.out.println("Student not found!");
158 |     }
159 | }
160 | 


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