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Studentmangement #564

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164 changes: 164 additions & 0 deletions NDV_Code_By_ChandiniB_Student_Mangement/Studentmange.java
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import java.util.*;

class Student {
int studentId;
String name;
String branch;
int year;
int marks;

public Student(int studentId, String name, String branch, int year, int marks) {
this.studentId = studentId;
this.name = name;
this.branch = branch;
this.year = year;
this.marks = marks;
}

public String toString() {
return "ID: " + studentId + ", Name: " + name + ", Branch: " + branch + ", Year: " + year + ", Marks: " + marks;
}
}

class StudentManager {
private Map<Integer, Student> students;

public StudentManager() {
students = new HashMap<>();
}

public void addStudent(Student student) {
students.put(student.studentId, student);
System.out.println("Student added: " + student);
}

public void viewStudent(int studentId) {
if (students.containsKey(studentId)) {
System.out.println(students.get(studentId));
} else {
System.out.println("Student not found.");
}
}

public void updateStudent(int studentId, String name, String branch, int year, int marks) {
if (students.containsKey(studentId)) {
Student student = students.get(studentId);
student.name = name;
student.branch = branch;
student.year = year;
student.marks = marks;
System.out.println("Student updated: " + student);
} else {
System.out.println("Student not found.");
}
}

public void deleteStudent(int studentId) {
if (students.containsKey(studentId)) {
students.remove(studentId);
System.out.println("Student deleted.");
} else {
System.out.println("Student not found.");
}
}

public void displayTopScorer() {
if (students.isEmpty()) {
System.out.println("No students to display.");
return;
}
Student topScorer = Collections.max(students.values(), Comparator.comparingInt(s -> s.marks));
System.out.println("Top Scorer: " + topScorer);
}

public void displayAverageMarks() {
if (students.isEmpty()) {
System.out.println("No students to calculate.");
return;
}
double average = students.values().stream().mapToInt(s -> s.marks).average().orElse(0.0);
System.out.println("Average Marks: " + average);
}
}

public class StudentManagementSystem {

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
StudentManager manager = new StudentManager();
int choice;

do {
System.out.println("\nStudent Management System");
System.out.println("1. Add Student");
System.out.println("2. View Student");
System.out.println("3. Update Student");
System.out.println("4. Delete Student");
System.out.println("5. View Top Scorer");
System.out.println("6. View Average Marks");
System.out.println("7. Exit");
System.out.print("Choose an option: ");
choice = scanner.nextInt();

switch (choice) {
case 1:
// Add Student
System.out.print("Enter student ID: ");
int id = scanner.nextInt();
scanner.nextLine(); // consume newline
System.out.print("Enter student name: ");
String name = scanner.nextLine();
System.out.print("Enter student branch: ");
String branch = scanner.nextLine();
System.out.print("Enter student year: ");
int year = scanner.nextInt();
System.out.print("Enter student marks: ");
int marks = scanner.nextInt();
manager.addStudent(new Student(id, name, branch, year, marks));
break;
case 2:
// View Student
System.out.print("Enter student ID to view: ");
int viewId = scanner.nextInt();
manager.viewStudent(viewId);
break;
case 3:
// Update Student
System.out.print("Enter student ID to update: ");
int updateId = scanner.nextInt();
scanner.nextLine(); // consume newline
System.out.print("Enter new student name: ");
String newName = scanner.nextLine();
System.out.print("Enter new student branch: ");
String newBranch = scanner.nextLine();
System.out.print("Enter new student year: ");
int newYear = scanner.nextInt();
System.out.print("Enter new student marks: ");
int newMarks = scanner.nextInt();
manager.updateStudent(updateId, newName, newBranch, newYear, newMarks);
break;
case 4:
// Delete Student
System.out.print("Enter student ID to delete: ");
int deleteId = scanner.nextInt();
manager.deleteStudent(deleteId);
break;
case 5:
// Display Top Scorer
manager.displayTopScorer();
break;
case 6:
// Display Average Marks
manager.displayAverageMarks();
break;
case 7:
System.out.println("Exiting program.");
break;
default:
System.out.println("Invalid option. Please try again.");
}
} while (choice != 7);

scanner.close();
}
}