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StudentManagementSystem.java
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StudentManagementSystem.java
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import java.util.Scanner;
public class StudentManagementSystem {
private static final int MAX_STUDENTS = 100; // Maximum number of students
private static final int MAX_SUBJECTS = 2;
private static final String[] studentIds = new String[MAX_STUDENTS]; // Array to store student IDs
private static final String[] studentNames = new String[MAX_STUDENTS]; // Array to store student names
private static final int[][] studentMarks = new int[MAX_STUDENTS][2]; // Array to store student marks
private static int studentCount = 0; // Current number of students
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
boolean running = true;
while (running) {
System.out.println("------------------------------------------------------------------------------");
System.out.println("| WELCOME TO GDSE MANAGEMENT SYSTEM |");
System.out.println("------------------------------------------------------------------------------");
System.out.println();
System.out.println("[1] Add New Student\t\t\t[2] Add New Student With Marks");
System.out.println("[3] Add Marks\t\t\t\t[4] Update Student Details");
System.out.println("[5] Update Marks\t\t\t[6] Delete Student");
System.out.println("[7] Print Student Details\t\t[8] Print Student Marks");
System.out.println("[9] Best in Programming Fundamentals\t[10] Best in Database Management System");
System.out.println();
System.out.print("Enter an option to continue: ");
int option = scanner.nextInt();
scanner.nextLine();
clearConsole();
switch (option) {
case 1:
addNewStudent(scanner);
break;
case 2:
addNewStudentWithMarks(scanner);
break;
case 3:
addMarks(scanner);
break;
case 4:
updateStudentDetails(scanner);
break;
case 5:
updateMarks(scanner);
break;
case 6:
deleteStudent(scanner);
break;
case 7:
printStudentDetails(scanner);
break;
case 8:
printStudentRanks(scanner);
break;
case 9:
bestInPRF(scanner);
break;
case 10:
bestInDBMS(scanner);
break;
case 0:
running = false;
System.out.println("Exiting the program. Goodbye!");
break;
default:
System.out.println("Invalid option. Please try again.");
}
System.out.println();
}
}
// --------------------------- (1) Add New Student ---------------------------
private static void addNewStudent(Scanner scanner) {
System.out.println("------------------------------------------------------------------------------");
System.out.println("| ADD NEW STUDENT |");
System.out.println("------------------------------------------------------------------------------");
System.out.println();
String studentId;
while (true) {
System.out.print("Enter Student ID: ");
studentId = scanner.nextLine();
if (containsStudentId(studentId)) {
System.out.println("Student ID already exists. Please enter a different Student ID.");
} else {
break;
}
}
System.out.print("Enter Student Name: ");
String studentName = scanner.nextLine();
studentIds[studentCount] = studentId;
studentNames[studentCount] = studentName;
studentCount++;
System.out.println("New student added successfully.");
while (true) {
System.out.print("Do you want to add another student? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("Y")) {
clearConsole();
addNewStudent(scanner);
return;
} else if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
} else {
System.out.println("Invalid choice. Please enter Y or N.");
}
}
}
// --------------------------- (2) Add New Student with Marks ---------------------------
private static void addNewStudentWithMarks(Scanner scanner) {
System.out.println("------------------------------------------------------------------------------");
System.out.println("| ADD NEW STUDENT WITH MARKS |");
System.out.println("------------------------------------------------------------------------------");
System.out.println();
String studentId;
while (true) {
System.out.print("Enter Student ID: ");
studentId = scanner.nextLine();
if (containsStudentId(studentId)) {
System.out.println("Student ID already exists. Please enter a different Student ID.");
} else {
break;
}
}
System.out.print("Enter Student Name: ");
String studentName = scanner.nextLine();
int[] marks = new int[2];
String[] subjects = { "PRF", "DBMS" };
for (int i = 0; i < marks.length; i++) {
while (true) {
System.out.print("Enter " + subjects[i] + " Marks: ");
int mark = scanner.nextInt();
scanner.nextLine();
if (mark < 0 || mark > 100) {
System.out.println("Invalid " + subjects[i] + " marks. Marks should be within the range of 0-100.");
} else {
marks[i] = mark;
break;
}
}
}
studentIds[studentCount] = studentId;
studentNames[studentCount] = studentName;
studentMarks[studentCount] = marks;
studentCount++;
System.out.println("New student with marks added successfully.");
while (true) {
System.out.print("Do you want to add another student with marks? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("Y")) {
clearConsole();
addNewStudentWithMarks(scanner);
return;
} else if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
} else {
System.out.println("Invalid choice. Please enter Y or N.");
}
}
}
// --------------------------- containsStudentID method ---------------------------
private static boolean containsStudentId(String studentId) {
for (int i = 0; i < studentCount; i++) {
if (studentIds[i] != null && studentIds[i].equals(studentId)) {
return true;
}
}
return false;
}
// --------------------------- (3) Add Marks ---------------------------
private static void addMarks(Scanner scanner) {
System.out.println("------------------------------------------------------------------------------");
System.out.println("| ADD MARKS |");
System.out.println("------------------------------------------------------------------------------");
System.out.println();
String studentId;
boolean continueSearch = true;
while (continueSearch) {
System.out.print("Enter Student ID: ");
studentId = scanner.nextLine();
int studentIndex = -1;
for (int i = 0; i < studentCount; i++) {
if (studentIds[i] != null && studentIds[i].equals(studentId)) {
studentIndex = i;
break;
}
}
if (studentIndex == -1) {
System.out.println("Invalid Student ID.");
System.out.print("Continue search? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
}
} else if (hasAssignedMarks(studentIndex)) {
System.out.println("Marks have already been assigned for this student.");
System.out.print("Continue search? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
}
} else {
String studentName = studentNames[studentIndex];
System.out.println("Student Name: " + studentName);
int[] marks = new int[2];
String[] subjects = { "PRF", "DBMS" };
for (int i = 0; i < marks.length; i++) {
while (true) {
System.out.print("Enter " + subjects[i] + " Marks: ");
int mark = scanner.nextInt();
scanner.nextLine();
if (mark < 0 || mark > 100) {
System.out.println(
"Invalid " + subjects[i] + " marks. Marks should be within the range of 0-100.");
} else {
marks[i] = mark;
break;
}
}
}
studentMarks[studentIndex] = marks;
System.out.println("Marks added successfully.");
while (true) {
System.out.print("Do you want to add marks for another student? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("Y")) {
clearConsole();
addMarks(scanner);
return;
} else if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
} else {
System.out.println("Invalid choice. Please enter Y or N.");
}
}
}
}
}
// --------------------------- hasAssignedMarks method ---------------------------
private static boolean hasAssignedMarks(int studentIndex) {
for (int mark : studentMarks[studentIndex]) {
if (mark != 0) {
return true;
}
}
return false;
}
// --------------------------- (4) Update Student Details ---------------------------
private static void updateStudentDetails(Scanner scanner) {
System.out.println("------------------------------------------------------------------------------");
System.out.println("| UPDATE STUDENT DETAILS |");
System.out.println("------------------------------------------------------------------------------");
System.out.println();
String studentId;
boolean continueSearch = true;
while (continueSearch) {
System.out.print("Enter Student ID: ");
studentId = scanner.nextLine();
int studentIndex = -1;
for (int i = 0; i < studentCount; i++) {
if (studentIds[i] != null && studentIds[i].equals(studentId)) {
studentIndex = i;
break;
}
}
if (studentIndex == -1) {
System.out.println("Invalid Student ID.");
System.out.print("Continue search? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
}
} else {
String studentName = studentNames[studentIndex];
System.out.println("Current Student Name: " + studentName);
System.out.print("Enter New Student Name: ");
String newStudentName = scanner.nextLine();
studentNames[studentIndex] = newStudentName;
System.out.println("Student details updated successfully.");
while (true) {
System.out.print("Do you want to update details for another student? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("Y")) {
clearConsole();
updateStudentDetails(scanner);
return;
} else if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
} else {
System.out.println("Invalid choice. Please enter Y or N.");
}
}
}
}
}
// --------------------------- (5) Update Marks ---------------------------
private static void updateMarks(Scanner scanner) {
System.out.println("------------------------------------------------------------------------------");
System.out.println("| UPDATE MARKS |");
System.out.println("------------------------------------------------------------------------------");
System.out.println();
String studentId;
boolean continueSearch = true;
while (continueSearch) {
System.out.print("Enter Student ID: ");
studentId = scanner.nextLine();
int studentIndex = -1;
for (int i = 0; i < studentCount; i++) {
if (studentIds[i] != null && studentIds[i].equals(studentId)) {
studentIndex = i;
break;
}
}
if (studentIndex == -1) {
System.out.println("Invalid Student ID.");
System.out.print("Continue search? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
}
} else if (!hasAssignedMarks(studentIndex)) {
System.out.println("Marks have not been assigned for this student yet.");
System.out.println("Please add marks for this student before updating.");
System.out.println();
continue;
} else {
String studentName = studentNames[studentIndex];
System.out.println("Student Name: " + studentName);
System.out.println("Current Marks:");
int[] marks = studentMarks[studentIndex];
String[] subjects = { "PRF", "DBMS" };
for (int i = 0; i < marks.length; i++) {
System.out.println(subjects[i] + ": " + marks[i]);
}
System.out.println();
for (int i = 0; i < marks.length; i++) {
while (true) {
System.out.print("Enter New " + subjects[i] + " Marks: ");
int mark = scanner.nextInt();
scanner.nextLine();
if (mark < 0 || mark > 100) {
System.out.println(
"Invalid " + subjects[i] + " marks. Marks should be within the range of 0-100.");
} else {
marks[i] = mark;
break;
}
}
}
studentMarks[studentIndex] = marks;
System.out.println("Marks updated successfully.");
while (true) {
System.out.print("Do you want to update marks for another student? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("Y")) {
clearConsole();
updateMarks(scanner);
return;
} else if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
} else {
System.out.println("Invalid choice. Please enter Y or N.");
}
}
}
}
}
// --------------------------- (6) Delete Student ---------------------------
private static void deleteStudent(Scanner scanner) {
System.out.println("------------------------------------------------------------------------------");
System.out.println("| DELETE STUDENT |");
System.out.println("------------------------------------------------------------------------------");
System.out.println();
String studentId;
boolean continueSearch = true;
while (continueSearch) {
System.out.print("Enter Student ID: ");
studentId = scanner.nextLine();
int studentIndex = -1;
for (int i = 0; i < studentCount; i++) {
if (studentIds[i] != null && studentIds[i].equals(studentId)) {
studentIndex = i;
break;
}
}
if (studentIndex == -1) {
System.out.println("Invalid Student ID.");
System.out.print("Continue search? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
}
} else {
String studentName = studentNames[studentIndex];
System.out.println("Student Name: " + studentName);
System.out.print("Are you sure you want to delete this student? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("Y")) {
// Delete student (array)
for (int i = studentIndex; i < studentCount - 1; i++) {
studentIds[i] = studentIds[i + 1];
studentNames[i] = studentNames[i + 1];
studentMarks[i] = studentMarks[i + 1];
}
// Reset the last element to null
studentIds[studentCount - 1] = null;
studentNames[studentCount - 1] = null;
studentMarks[studentCount - 1] = null;
studentCount--;
System.out.println("Student deleted successfully.");
}
while (true) {
System.out.print("Do you want to delete another student? (Y/N): ");
choice = scanner.nextLine();
if (choice.equalsIgnoreCase("Y")) {
clearConsole();
deleteStudent(scanner);
return;
} else if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
} else {
System.out.println("Invalid choice. Please enter Y or N.");
}
}
}
}
}
// --------------------------- (7) Print Student Details ---------------------------
private static void printStudentDetails(Scanner scanner) {
System.out.println("------------------------------------------------------------------------------");
System.out.println("| PRINT STUDENT MARKS |");
System.out.println("------------------------------------------------------------------------------");
System.out.println();
String studentId;
boolean continueSearch = true;
while (continueSearch) {
System.out.print("Enter Student ID: ");
studentId = scanner.nextLine();
int studentIndex = -1;
for (int i = 0; i < studentCount; i++) {
if (studentIds[i] != null && studentIds[i].equals(studentId)) {
studentIndex = i;
break;
}
}
if (studentIndex == -1) {
System.out.println("Invalid Student ID.");
System.out.print("Continue search? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
}
} else if (!hasAssignedMarks(studentIndex)) {
System.out.println("Marks have not been assigned for this student yet.");
System.out.println("Please add marks for this student before updating.");
System.out.println();
continue;
} else {
String studentName = studentNames[studentIndex];
System.out.println("Student Name: " + studentName);
System.out.println();
System.out.println("---------------------------------------");
System.out.println("------------ Current Marks ------------");
int[] marks = studentMarks[studentIndex];
String[] subjects = { "PRF", "DBMS" };
for (int i = 0; i < marks.length; i++) {
System.out.println(subjects[i] + ": " + marks[i]);
}
int totalMarks = calculateTotalMarks(studentIndex);
double averageMarks = calculateAverageMarks(studentIndex);
int rank = calculateRank(studentIndex);
System.out.println("Total Marks: " + totalMarks);
System.out.println("Average Marks: " + averageMarks);
System.out.print("Rank: " + rank);
switch (rank) {
case 1:
System.out.print(" (First)");
break;
case 2:
System.out.print(" (Second)");
break;
case 3:
System.out.print(" (Third)");
break;
case MAX_STUDENTS:
System.out.print(" (Last)");
break;
}
System.out.println();
System.out.println("---------------------------------------");
}
while (true) {
System.out.print("Do you want to continue seeking student details? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("Y")) {
clearConsole();
printStudentDetails(scanner);
return;
} else if (choice.equalsIgnoreCase("N")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
} else {
System.out.println("Invalid choice. Please enter Y or N.");
}
}
}
}
// --------------------------- calculateTotalMarks method ---------------------------
private static int calculateTotalMarks(int studentIndex) {
int totalMarks = 0;
for (int i = 0; i < MAX_SUBJECTS; i++) {
totalMarks += studentMarks[studentIndex][i];
}
return totalMarks;
}
// --------------------------- calculateAverageMarks method ---------------------------
private static double calculateAverageMarks(int studentIndex) {
int totalMarks = calculateTotalMarks(studentIndex);
return (double) totalMarks / MAX_SUBJECTS;
}
// --------------------------- calculateRank method ---------------------------
private static int calculateRank(int studentIndex) {
int studentTotalMarks = calculateTotalMarks(studentIndex);
int rank = 1;
for (int i = 0; i < studentCount; i++) {
if (i != studentIndex) {
int otherStudentTotalMarks = calculateTotalMarks(i);
if (otherStudentTotalMarks > studentTotalMarks) {
rank++;
}
}
}
return rank;
}
// --------------------------- (8) Print Student Ranks ---------------------------
private static void printStudentRanks(Scanner scanner) {
System.out.println("------------------------------------------------------------------------------");
System.out.println("| PRINT STUDENT RANKS |");
System.out.println("------------------------------------------------------------------------------");
System.out.println();
if (studentCount == 0) {
System.out.println("No students found in the system.");
System.out.println();
return;
}
boolean[] visited = new boolean[studentCount]; // track visited students (array)
int remainingStudents = studentCount; // Count of remaining unvisited students
System.out.println("------------------------------------------------------------------------------");
System.out.printf("| %-5s | %-11s | %-20s | %-12s | %-14s |%n", "Rank", "Student ID", "Student Name",
"Total Marks", "Average Marks");
System.out.println("------------------------------------------------------------------------------");
while (remainingStudents > 0) {
int minRank = Integer.MAX_VALUE;
int minRankIndex = -1;
// Find the student with the lowest rank among unvisited students
for (int i = 0; i < studentCount; i++) {
if (!visited[i] && calculateRank(i) < minRank) {
minRank = calculateRank(i);
minRankIndex = i;
}
}
// Print the details of the student with the lowest rank
int totalMarks = calculateTotalMarks(minRankIndex);
double averageMarks = calculateAverageMarks(minRankIndex);
System.out.printf("| %-5s | %-11s | %-20s | %-12s | %-14s |%n", minRank, studentIds[minRankIndex],
studentNames[minRankIndex], totalMarks, averageMarks);
// Mark the student as visited
visited[minRankIndex] = true;
remainingStudents--;
}
System.out.println("------------------------------------------------------------------------------");
System.out.println();
while (true) {
System.out.print("Do you want to go back to main menu? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("Y")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
} else if (choice.equalsIgnoreCase("N")) {
clearConsole();
printStudentRanks(scanner);
return;
} else {
System.out.println("Invalid choice. Please enter Y or N.");
}
}
}
// --------------------------- (9) Best in PRF Module ---------------------------
private static void bestInPRF(Scanner scanner) {
System.out.println("------------------------------------------------------------------------------");
System.out.println("| BEST IN PRF MODULE |");
System.out.println("------------------------------------------------------------------------------");
System.out.println();
if (studentCount == 0) {
System.out.println("No students found in the system.");
System.out.println();
return;
}
boolean[] visited = new boolean[studentCount]; // track visited students (array)
int remainingStudents = studentCount; // Count of remaining unvisited students
System.out.println("--------------------------------------------------------------");
System.out.printf("| %-5s | %-20s | %-12s | %-12s |%n", "ID", "Name", "PRF Marks", "DBMS Marks");
System.out.println("--------------------------------------------------------------");
while (remainingStudents > 0) {
int maxPRF = -1;
int maxPRFIndex = -1;
// Find the student with the highest PRF marks among unvisited students
for (int i = 0; i < studentCount; i++) {
if (!visited[i] && studentMarks[i][0] > maxPRF) {
maxPRF = studentMarks[i][0];
maxPRFIndex = i;
}
}
// Print the details of the student with the highest PRF marks
System.out.printf("| %-5s | %-20s | %-12s | %-12s |%n", studentIds[maxPRFIndex], studentNames[maxPRFIndex],
studentMarks[maxPRFIndex][0], studentMarks[maxPRFIndex][1]);
// Mark the student as visited
visited[maxPRFIndex] = true;
remainingStudents--;
}
System.out.println("--------------------------------------------------------------");
System.out.println();
while (true) {
System.out.print("Do you want to go back to main menu? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("Y")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
} else if (choice.equalsIgnoreCase("N")) {
clearConsole();
bestInPRF(scanner);
return;
} else {
System.out.println("Invalid choice. Please enter Y or N.");
}
}
}
// --------------------------- (10) Best in DBMS Module ---------------------------
private static void bestInDBMS(Scanner scanner) {
System.out.println("------------------------------------------------------------------------------");
System.out.println("| BEST IN DBMS MODULE |");
System.out.println("------------------------------------------------------------------------------");
System.out.println();
if (studentCount == 0) {
System.out.println("No students found in the system.");
System.out.println();
return;
}
boolean[] visited = new boolean[studentCount]; // track visited students (array)
int remainingStudents = studentCount; // Count of remaining unvisited students
System.out.println("--------------------------------------------------------------");
System.out.printf("| %-5s | %-20s | %-12s | %-12s |%n", "ID", "Name", "PRF Marks", "DBMS Marks");
System.out.println("--------------------------------------------------------------");
while (remainingStudents > 0) {
int maxDBMS = -1;
int maxDBMSIndex = -1;
// Find the student with the highest DBMS marks among unvisited students
for (int i = 0; i < studentCount; i++) {
if (!visited[i] && studentMarks[i][1] > maxDBMS) {
maxDBMS = studentMarks[i][1];
maxDBMSIndex = i;
}
}
// Print the details of the student with the highest DBMS marks
System.out.printf("| %-5s | %-20s | %-12s | %-12s |%n", studentIds[maxDBMSIndex], studentNames[maxDBMSIndex],
studentMarks[maxDBMSIndex][0], studentMarks[maxDBMSIndex][1]);
// Mark the student as visited
visited[maxDBMSIndex] = true;
remainingStudents--;
}
System.out.println("--------------------------------------------------------------");
System.out.println();
while (true) {
System.out.print("Do you want to go back to main menu? (Y/N): ");
String choice = scanner.nextLine();
if (choice.equalsIgnoreCase("Y")) {
System.out.println("Returning to the main menu.");
clearConsole();
return;
} else if (choice.equalsIgnoreCase("N")) {
clearConsole();
bestInDBMS(scanner);
return;
} else {
System.out.println("Invalid choice. Please enter Y or N.");
}
}
}
// --------------------------- clearConsole method ---------------------------
public final static void clearConsole() {
try {
final String os = System.getProperty("os.name");
if (os.contains("Windows")) {
new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor();
} else {
System.out.print("\033[H\033[2J");
System.out.flush();
}
} catch (final Exception e) {
e.printStackTrace();
// Handle any exceptions.
}
}
}