[Manan] ADD:Student Record Management using a Singly Linked List

Author: mananguptamg

StudentRecordManagement.java

@@ -0,0 +1,185 @@
+// Class to represent a Student
+class Student {
+    int rollNumber;
+    String name;
+    int age;
+    char grade;
+    Student next; // Pointer to next student
+
+    // Constructor to initialize student data
+    Student(int rollNumber, String name, int age, char grade) {
+        this.rollNumber = rollNumber;
+        this.name = name;
+        this.age = age;
+        this.grade = grade;
+        this.next = null;
+    }
+}
+
+// Class to manage the Student Singly Linked List
+class StudentLinkedList {
+    Student head; // Head of the list
+
+    // Method to add a student at the beginning
+    public void addStudentAtBeginning(int rollNumber, String name, int age, char grade) {
+        Student newStudent = new Student(rollNumber, name, age, grade);
+        newStudent.next = head;
+        head = newStudent;
+    }
+
+    // Method to add a student at the end
+    public void addStudentAtEnd(int rollNumber, String name, int age, char grade) {
+        Student newStudent = new Student(rollNumber, name, age, grade);
+
+        if (head == null) {
+            head = newStudent;
+            return;
+        }
+
+        Student temp = head;
+        while (temp.next != null) {
+            temp = temp.next;
+        }
+        temp.next = newStudent;
+    }
+
+    // Method to add a student at a specific position
+    public void addStudentAtPosition(int rollNumber, String name, int age, char grade, int position) {
+        if (position <= 0) {
+            System.out.println("Invalid position.");
+            return;
+        }
+
+        Student newStudent = new Student(rollNumber, name, age, grade);
+
+        if (position == 1) {
+            newStudent.next = head;
+            head = newStudent;
+            return;
+        }
+
+        Student temp = head;
+        for (int i = 1; i < position - 1 && temp != null; i++) {
+            temp = temp.next;
+        }
+
+        if (temp == null) {
+            System.out.println("Position out of range.");
+            return;
+        }
+
+        newStudent.next = temp.next;
+        temp.next = newStudent;
+    }
+
+    // Method to delete a student record by roll number
+    public void deleteStudent(int rollNumber) {
+        if (head == null) {
+            System.out.println("No students in the record.");
+            return;
+        }
+
+        if (head.rollNumber == rollNumber) {
+            head = head.next;
+            return;
+        }
+
+        Student temp = head;
+        while (temp.next != null && temp.next.rollNumber != rollNumber) {
+            temp = temp.next;
+        }
+
+        if (temp.next == null) {
+            System.out.println("Student with Roll Number " + rollNumber + " not found.");
+            return;
+        }
+
+        temp.next = temp.next.next;
+    }
+
+    // Method to search for a student by Roll Number
+    public void searchStudent(int rollNumber) {
+        Student temp = head;
+        while (temp != null) {
+            if (temp.rollNumber == rollNumber) {
+                System.out.println("Student Found: " + temp.rollNumber + " | " + temp.name + " | Age: " + temp.age + " | Grade: " + temp.grade);
+                return;
+            }
+            temp = temp.next;
+        }
+        System.out.println("Student with Roll Number " + rollNumber + " not found.");
+    }
+
+    // Method to update a student's grade
+    public void updateStudentGrade(int rollNumber, char newGrade) {
+        Student temp = head;
+        while (temp != null) {
+            if (temp.rollNumber == rollNumber) {
+                temp.grade = newGrade;
+                System.out.println("Updated Grade for Roll Number " + rollNumber + " to " + newGrade);
+                return;
+            }
+            temp = temp.next;
+        }
+        System.out.println("Student with Roll Number " + rollNumber + " not found.");
+    }
+
+    // Method to display all student records
+    public void displayAllStudents() {
+        if (head == null) {
+            System.out.println("No students in the record.");
+            return;
+        }
+
+        System.out.println("Student Records:");
+        Student temp = head;
+        while (temp != null) {
+            System.out.println(temp.rollNumber + " | " + temp.name + " | Age: " + temp.age + " | Grade: " + temp.grade);
+            temp = temp.next;
+        }
+    }
+}
+
+// Main class to run the program
+public class StudentRecordManagement {
+    public static void main(String[] args) {
+        StudentLinkedList studentList = new StudentLinkedList();
+
+        // Adding students
+        studentList.addStudentAtEnd(1, "Amit", 11, 'A');
+        studentList.addStudentAtEnd(2, "Arjun", 12, 'B');
+        studentList.addStudentAtBeginning(3, "Chandan", 11, 'C');
+        studentList.addStudentAtPosition(4, "Manan", 11, 'B', 2);
+
+        // Display all students
+        studentList.displayAllStudents();
+
+        // Searching for a student
+        studentList.searchStudent(102);
+
+        // Updating a student's grade
+        studentList.updateStudentGrade(101, 'B');
+
+        // Deleting a student
+        studentList.deleteStudent(103);
+
+        // Displaying students after deletion
+        studentList.displayAllStudents();
+    }
+}
+
+
+//SampleOutput
+//Student Records:
+//        3 | Chandan | Age: 11 | Grade: C
+//4 | Manan | Age: 11 | Grade: B
+//1 | Amit | Age: 11 | Grade: A
+//2 | Arjun | Age: 12 | Grade: B
+//Student with Roll Number 102 not found.
+//Student with Roll Number 101 not found.
+//Student with Roll Number 103 not found.
+//Student Records:
+//        3 | Chandan | Age: 11 | Grade: C
+//4 | Manan | Age: 11 | Grade: B
+//1 | Amit | Age: 11 | Grade: A
+//2 | Arjun | Age: 12 | Grade: B