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kishanrajput23kishanrajput23
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Merge pull request #457 from Mohammed-3tef/main
Replace "Student Management System.java" with Enhanced Version
2 parents 7a1580e + e83ec86 commit 98205b9

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‎Student Management System.java‎

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‎Student Management System/App.java‎

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import java.util.*;
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import packages.system.*;
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import packages.fileHandler.*;
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// ---------------------------------------------- MAIN FUNCTION ----------------------------------------------
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public class App {
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public static void main(String[] args) {
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System.out.println("\n\t------------ WELCOME TO STUDENT MANAGEMENT SYSTEM ------------\n");
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Scanner scanner = new Scanner(System.in);
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StudentSystem system = new StudentSystem();
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while (true) {
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System.out.println("Choose an option:");
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System.out.println(" 1. Add Student.");
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System.out.println(" 2. Remove Student.");
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System.out.println(" 3. Update Student.");
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System.out.println(" 4. Search Student by ID.");
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System.out.println(" 5. List and Sort Students.");
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System.out.println(" 6. Filter Students.");
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System.out.println(" 7. Count Total Students.");
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System.out.println(" 8. Calculate Average GPA.");
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System.out.println(" 9. Display Top 5 Students.");
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System.out.println(" 10. Display Failing Students.");
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System.out.println(" 11. Generate Summary.");
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System.out.println(" 0. Exit Application.");
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int choice = InputValidator.inputValidChoice(scanner);
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System.out.println();
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switch (choice) {
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case 1: // Add Student
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while (true) {
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System.out.println("Choose an option to add student:");
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System.out.println(" 1. Add Student from CSV File.");
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System.out.println(" 2. Add Student Manually.");
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System.out.println(" 0. Exit Add Student.");
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int addChoice = InputValidator.inputValidChoice(scanner);
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if (addChoice == 0) { // Exit Add Student
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System.out.println();
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break;
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}
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switch (addChoice) {
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case 1: // Add Student from CSV File
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system.mergeStudentSystem(CsvFileHandler.readCsvFile());
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break;
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case 2: // Add Student Manually
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String name = InputValidator.addUniqueName(scanner, system);
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int id = InputValidator.addUniqueID(scanner, system);
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double gpa = InputValidator.inputValidGPA(scanner);
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String year = InputValidator.inputValidYear(scanner);
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String department = InputValidator.inputValidDepartment(scanner);
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if (year.equals("First") || year.equals("Second")) department = "General";
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system.addStudent(name, id, gpa, year, department, false);
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break;
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default: // Invalid choice
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System.out.println("Invalid choice, please try again.");
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}
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}
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break;
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case 2: // Remove Student
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int removeID = InputValidator.inputValidID(scanner);
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system.removeStudentByID(removeID);
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break;
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case 3: // Update Student
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int updateID = InputValidator.inputValidID(scanner);
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while (true) {
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System.out.println("Choose an option to update:");
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System.out.println(" 1. Student's Name.");
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System.out.println(" 2. Student's GPA.");
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System.out.println(" 3. Student's Year.");
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System.out.println(" 4. Student's Department.");
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System.out.println(" 0. Exit Update.");
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int updateChoice = InputValidator.inputValidChoice(scanner);
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if (updateChoice == 0) { // Exit Update
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System.out.println();
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break;
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}
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switch (updateChoice) {
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case 1: // Update Student's Name
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String newName = InputValidator.addUniqueName(scanner, system);
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system.updateStudentByID(updateID, newName, -1, null, null);
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break;
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case 2: // Update Student's GPA
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double newGPA = InputValidator.inputValidGPA(scanner);
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scanner.nextLine();
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system.updateStudentByID(updateID, null, newGPA, null, null);
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break;
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case 3: // Update Student's Year
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String newYear = InputValidator.inputValidYear(scanner);
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scanner.nextLine();
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system.updateStudentByID(updateID, null, -1, newYear, null);
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break;
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case 4: // Update Student's Department
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String newDepartment = InputValidator.inputValidDepartment(scanner);
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scanner.nextLine();
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system.updateStudentByID(updateID, null, -1, null, newDepartment);
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break;
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default: // Invalid choice
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System.out.println("Invalid choice, please try again.");
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}
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}
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break;
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case 4: // Search Student by ID
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int searchID = InputValidator.inputValidID(scanner);
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system.searchByID(searchID);
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break;
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case 5: // List and Sort Students
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while (true) {
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System.out.println("Output all students in:");
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System.out.println(" 1. The Console.");
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System.out.println(" 2. A File.");
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System.out.println(" 0. Exit List and Sort.");
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int outputChoice = InputValidator.inputValidChoice(scanner);
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if (outputChoice == 0) { // Exit List and Sort
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System.out.println();
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break;
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}
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else if (outputChoice == 1) { // Output in the Console
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System.out.print("Enter sorting criteria (GPA, ID, Name, Year): ");
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String sortBy = scanner.nextLine();
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while (!sortBy.matches("GPA|ID|Name|Year")) {
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System.out.println("Invalid input. Please enter a valid sorting criteria.");
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System.out.print("Enter sorting criteria (GPA, ID, Name, Year): ");
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sortBy = scanner.nextLine();
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}
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system.listAndSortAllStudents(sortBy);
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break;
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}
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else if (outputChoice == 2) { // Output in a File (CSV)
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CsvFileHandler.writeCsvFile(system);
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break;
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}
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else System.out.println("Invalid choice, please try again.\n"); // Invalid choice
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}
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break;
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case 6: // Filter Students
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System.out.print("Choose an option to filter (GPA - Year - Department): ");
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String filterChoice = scanner.nextLine();
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while (!filterChoice.matches("GPA|Year|Department")) {
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System.out.println("Invalid input. Please enter a valid year.");
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System.out.print("Choose an option to filter (Age - GPA - Year - Department): ");
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filterChoice = scanner.nextLine();
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}
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switch (filterChoice) {
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case "GPA":
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double filterGPA = InputValidator.inputValidGPA(scanner);
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System.out.println();
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system.filterByGPA(filterGPA);
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break;
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case "Year":
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String filterYear = InputValidator.inputValidYear(scanner);
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System.out.println();
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system.filterByYear(filterYear);
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break;
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case "Department":
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String filterDepartment = InputValidator.inputValidDepartment(scanner);
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System.out.println();
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system.filterByDepartment(filterDepartment);
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break;
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default:
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System.out.println("Invalid choice, please try again.\n");
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}
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break;
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case 7: // Count Total Students
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system.countTotalStudents();
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break;
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case 8: // Calculate Average GPA
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system.calculateAverageGPA();
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break;
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case 9: // Display Top 5 Students
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system.displayTop5();
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break;
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case 10: // Display Failing Students
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system.displayFailingStudents();
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break;
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case 11: // Generate Summary
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System.out.println("Choose an option to output generated summary:");
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System.out.println(" 1. Output the Summary in the Console.");
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System.out.println(" 2. Output the Summary in the Report File.");
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System.out.println(" 0. Exit Summary.");
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int summaryChoice = InputValidator.inputValidChoice(scanner);
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if (summaryChoice == 0) { // Exit Summary
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System.out.println();
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break;
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}
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switch (summaryChoice) {
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case 1: // Output the Summary in the Console
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system.generateSummary();
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break;
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case 2: // Output the Summary in the Report File
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TxtFileHandler.writeTxtFile(system);
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break;
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default: // Invalid choice
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System.out.println("Invalid choice, please try again.");
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}
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break;
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case 0: // Exit Application.
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System.out.println("--- Thank you for using Student Management System Application!");
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System.out.println("\t--- Exiting system...");
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scanner.close();
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return;
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default: // Invalid choice
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System.out.println("Invalid choice, please try again.\n");
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}
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}
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}
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}

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