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Main.java
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package LAB.Sixth;
import javax.swing.*;
import java.util.*;
public class Main {
private static ArrayList<Student> allStudentList = new ArrayList<Student>();
private static ArrayList<Faculty> allFacultyList = new ArrayList<Faculty>();
private static ArrayList<Course> allCourseList = new ArrayList<Course>();
public static void startMenu() {
String title = "Menu-Based Application";
String msg = "MENU :\n" +
"\n" +
"---------------------------------------------------------------------------------------------------------------\n" +
" Select your Choice\n" +
"---------------------------------------------------------------------------------------------------------------\n\n";
String[] option = {"Add", "Delete", "Update", "Print", "Search", "EXIT"};
int select = JOptionPane.showOptionDialog(null, msg, title, JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, option, 7);
if (select == 0)
add();
else if (select == 1)
delete();
else if (select == 2)
update();
else if (select == 3)
print();
else if (select == 4)
search();
else if (select == 5)
System.exit(0);
else
JOptionPane.showMessageDialog(null, "Please select 'EXIT' button to exit", title, JOptionPane.ERROR_MESSAGE);
startMenu();
}
public static Student createStudent() {
String title = "Menu-Based Application";
String[] returnOption = {"Return Home", "Cancel"};
String[] returnOption2 = {"Return Home"};
int studentId;
String studentName;
double studentCGPA;
while (true) {
String msgID = "Enter the Student's ID";
String idString = JOptionPane.showInputDialog(null, msgID, title, JOptionPane.QUESTION_MESSAGE);
if (idString == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (idString != null && idString.isBlank()) {
JOptionPane.showOptionDialog(null, "ID number iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
try {
if (idString != null) {
studentId = Integer.parseInt(idString);
break;
}
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(null, "Please input correct ID", title, JOptionPane.ERROR_MESSAGE);
}
} // Student ID END
while (true) {
String msgName = "Enter the Student's Name";
studentName = JOptionPane.showInputDialog(null, msgName, title, JOptionPane.QUESTION_MESSAGE);
if (studentName == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
} else
break;
}
if (studentName.isBlank()) {
JOptionPane.showOptionDialog(null, "Name iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
// Student Name END
while (true) {
String msgCGPA = "Enter the Student's CGPA ";
String CGPAString = JOptionPane.showInputDialog(null, msgCGPA, title, JOptionPane.QUESTION_MESSAGE);
if (CGPAString == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (CGPAString != null && CGPAString.isBlank()) {
JOptionPane.showOptionDialog(null, "Credit iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
try {
if (CGPAString != null && !(Double.parseDouble(CGPAString) > 0 && Double.parseDouble(CGPAString) <= 4)) {
JOptionPane.showMessageDialog(null, "Invalid CGPA", title, JOptionPane.ERROR_MESSAGE);
continue;
}
if (CGPAString != null) {
studentCGPA = Double.parseDouble(CGPAString);
break;
}
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(null, "Please input correct CGPA format", title, JOptionPane.ERROR_MESSAGE);
}
} // Student CGPA END
return new Student(studentId, studentName, studentCGPA);
}
// creating student END
public static Faculty creatingFaculty() {
String title = "Menu-Based Application";
String[] returnOption = {"Return Home", "Cancel"};
String[] returnOption2 = {"Return Home"};
int facultyId;
String facultyName;
String facultyPosition;
while (true) {
String msgID = "Enter the Faculty's ID";
String idString = JOptionPane.showInputDialog(null, msgID, title, JOptionPane.QUESTION_MESSAGE);
if (idString == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (idString != null && idString.isBlank()) {
JOptionPane.showOptionDialog(null, "ID number iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
try {
if (idString != null) {
facultyId = Integer.parseInt(idString);
break;
}
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(null, "Please input correct ID", title, JOptionPane.ERROR_MESSAGE);
}
} // Faculty ID END
while (true) {
String msgName = "Enter the Faculty's Name";
facultyName = JOptionPane.showInputDialog(null, msgName, title, JOptionPane.QUESTION_MESSAGE);
if (facultyName == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
} else
break;
}
if (facultyName.isBlank()) {
JOptionPane.showOptionDialog(null, "Name iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
// Faculty Name END
while (true) {
String msgName = "Enter the Faculty's Position";
facultyPosition = JOptionPane.showInputDialog(null, msgName, title, JOptionPane.QUESTION_MESSAGE);
if (facultyPosition == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
} else
break;
}
if (facultyPosition.isBlank()) {
JOptionPane.showOptionDialog(null, "Position Name iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
// Faculty Position END
return new Faculty(facultyId, facultyName, facultyPosition);
}
// Creating Faculty END
public static void add() {
String title = "Menu-Based Application";
String[] returnOption = {"Return Home", "Cancel"};
String[] returnOption2 = {"Return Home"};
String msg = "\n" +
"---------------------------------------------------------------------------------------------------------------\n" +
" Add-Option\n" +
"---------------------------------------------------------------------------------------------------------------\n\n";
String[] option = {"Add a Student", "Add a Course", "Add a Faculty"};
int select;
while (true) {
select = JOptionPane.showOptionDialog(null, msg, title, JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, option, 7);
if (select != -1)
break;
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (select == 0) { // Add a Student
allStudentList.add(createStudent());
System.out.println(allStudentList.toString());
}
else if (select == 1) { // Add a Course
Course course = new Course();
while (true) {
String msgID = "Enter the Course ID";
course.setCourseId(JOptionPane.showInputDialog(null, msgID, title, JOptionPane.QUESTION_MESSAGE));
if (course.getCourseId() == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
} else
break;
}
if (course.getCourseId().isBlank()) {
JOptionPane.showOptionDialog(null, "Course ID iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
// Course ID END
while (true) {
String msgName = "Enter the name of the course title";
course.setCourseTitle(JOptionPane.showInputDialog(null, msgName, title, JOptionPane.QUESTION_MESSAGE));
if (course.getCourseTitle() == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
} else
break;
}
if (course.getCourseTitle().isBlank()) {
JOptionPane.showOptionDialog(null, "Course Title iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
// Course Title END
while (true) {
String msgCredit = "Enter the credit for " + course.getCourseId();
String creditString = JOptionPane.showInputDialog(null, msgCredit, title, JOptionPane.QUESTION_MESSAGE);
if (creditString == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (creditString != null && creditString.isBlank()) {
JOptionPane.showOptionDialog(null, "Course Credit iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
try {
if (creditString != null && (Double.parseDouble(creditString) != 1 && Double.parseDouble(creditString) != 1.5 && Double.parseDouble(creditString) != 2 && Double.parseDouble(creditString) != 2.5 && Double.parseDouble(creditString) != 3 && Double.parseDouble(creditString) != 3.5 && Double.parseDouble(creditString) != 4 && Double.parseDouble(creditString) != 4.5 && Double.parseDouble(creditString) != 5 && Double.parseDouble(creditString) != 5.5 && Double.parseDouble(creditString) != 6 && Double.parseDouble(creditString) != 6.5 && Double.parseDouble(creditString) != 7 && Double.parseDouble(creditString) != 7.5 && Double.parseDouble(creditString) != 8)) {
JOptionPane.showMessageDialog(null, "Invalid Credit", title, JOptionPane.ERROR_MESSAGE);
}
if (creditString != null && (Double.parseDouble(creditString) == 1 || Double.parseDouble(creditString) == 1.5 || Double.parseDouble(creditString) == 2 || Double.parseDouble(creditString) == 2.5 || Double.parseDouble(creditString) == 3 || Double.parseDouble(creditString) == 3.5 || Double.parseDouble(creditString) == 4 || Double.parseDouble(creditString) == 4.5 || Double.parseDouble(creditString) == 5 || Double.parseDouble(creditString) == 5.5 || Double.parseDouble(creditString) == 6 || Double.parseDouble(creditString) == 6.5 || Double.parseDouble(creditString) == 7 || Double.parseDouble(creditString) == 7.5 || Double.parseDouble(creditString) == 8)) {
course.setCredit(Double.parseDouble(creditString));
break;
}
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(null, "Please input correct credit format", title, JOptionPane.ERROR_MESSAGE);
}
}
// Course Credit END
//course.addFaculty(creatingFaculty());
int addCheckFt = JOptionPane.showOptionDialog(null, "Want to add a new Faculty..?", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, null, 0);
if (addCheckFt == 0) {
Faculty faculty = creatingFaculty();
course.setFaculty(faculty);
allFacultyList.add(faculty);
}
while (true) {
if (course.getNumberOfStudent() < 40) {
int addCheckSt = JOptionPane.showOptionDialog(null, "Want to add a new student...?", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, 0);
if (addCheckSt == 0) {
Student student = createStudent();
course.addStudent(student);
allStudentList.add(student);
} else
break;
} else {
JOptionPane.showOptionDialog(null, "Too Many Students", title, JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption2, 0);
allCourseList.add(course);
startMenu();
}
}
allCourseList.add(course);
System.out.println(course.toString());
} else if (select == 2) { // Add a Faculty
//Faculty faculty = creatingFaculty();
allFacultyList.add(creatingFaculty());
}
} // END of add
public static void delete() {
String title = "Menu-Based Application";
String[] returnOption = {"Return Home", "Cancel"};
String[] returnOption2 = {"Return Home"};
String msg = "\n" +
"---------------------------------------------------------------------------------------------------------------\n" +
" Delete-Option\n" +
"---------------------------------------------------------------------------------------------------------------\n\n";
String[] option = {"Delete a Student", "Delete a Course", "Delete a Faculty"};
int select;
while (true) {
select = JOptionPane.showOptionDialog(null, msg, title, JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, option, 7);
if (select != -1)
break;
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (select == 0) {
// enter student id
int studentId;
while (true) {
String msgID = "Enter the Student's ID";
String idString = JOptionPane.showInputDialog(null, msgID, title, JOptionPane.QUESTION_MESSAGE);
if (idString == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (idString != null && idString.isBlank()) {
JOptionPane.showOptionDialog(null, "ID number iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
try {
if (idString != null) {
studentId = Integer.parseInt(idString);
break;
}
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(null, "Please input correct ID format", title, JOptionPane.ERROR_MESSAGE);
}
}
int exitSt = 0;
for (Student student : allStudentList) {
if (student.getStudentId()==studentId)
exitSt++;
}
if (exitSt==0) {
JOptionPane.showOptionDialog(null, "ID number Not Found", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
String msgSt = "What do you want to delete...?";
String[] optionSt = {"Student Profile", "From a Course"};
int selectOp;
while (true) {
selectOp = JOptionPane.showOptionDialog(null, msgSt, title, JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, optionSt, 7);
if (selectOp != -1)
break;
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (selectOp == 0) { // delete a student profile
try {
for (Student student : allStudentList) {
if (student.getStudentId() == studentId) {
allStudentList.remove(student);
JOptionPane.showMessageDialog(null, "Student Profile deleted", title, JOptionPane.INFORMATION_MESSAGE);
}
}
} catch (ConcurrentModificationException ignored) {
}
for (Course course : allCourseList) {
try {
course.dropStudent(studentId);
} catch (ConcurrentModificationException ignored) {
}
}
}
else if (selectOp == 1) { // delete a student from a course
String courseId;
while (true) {
String msgID = "Enter the Course ID";
courseId = JOptionPane.showInputDialog(null, msgID, title, JOptionPane.QUESTION_MESSAGE);
if (courseId == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
} else
break;
}
if (courseId.isBlank()) {
JOptionPane.showOptionDialog(null, "Course ID iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
} // end search ID
for (Course course : allCourseList) {
if (course.getCourseId().equals(courseId)) {
try {
course.dropStudent(studentId);
} catch (ConcurrentModificationException ignored) {
}
}
}
}
} // END of delete a student
else if (select == 1) { // delete a course
String courseId;
while (true) {
String msgID = "Enter the Course ID";
courseId = JOptionPane.showInputDialog(null, msgID, title, JOptionPane.QUESTION_MESSAGE);
if (courseId == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
} else
break;
}
if (courseId.isBlank()) {
JOptionPane.showOptionDialog(null, "Course ID iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
} // END search ID
int exitCr = 0;
for (Course course : allCourseList) {
if (course.getCourseId().equals(courseId))
exitCr++;
}
if (exitCr==0) {
JOptionPane.showOptionDialog(null, "ID number Not Found", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
try {
for (Course course : allCourseList) {
if (course.getCourseId().equals(courseId)) {
allCourseList.remove(course);
JOptionPane.showMessageDialog(null, "Course deleted", title, JOptionPane.INFORMATION_MESSAGE);
}
}
} catch (ConcurrentModificationException ignored) {
}
} // END of a deleted course
else if (select == 2) { // delete a faculty
int facultyId;
while (true) {
String msgID = "Enter the Faculty's ID";
String idString = JOptionPane.showInputDialog(null, msgID, title, JOptionPane.QUESTION_MESSAGE);
if (idString == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (idString != null && idString.isBlank()) {
JOptionPane.showOptionDialog(null, "ID number iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
try {
if (idString != null) {
facultyId = Integer.parseInt(idString);
break;
}
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(null, "Please input correct ID format", title, JOptionPane.ERROR_MESSAGE);
}
}
int exitFt = 0;
for (Faculty faculty : allFacultyList) {
if (faculty.getFacultyId()==facultyId)
exitFt++;
}
if (exitFt==0) {
JOptionPane.showOptionDialog(null, "ID number Not Found", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
String msgSt = "What do you want to delete...?";
String[] optionSt = {"Faculty Profile", "From a Course"};
int selectOp;
while (true) {
selectOp = JOptionPane.showOptionDialog(null, msgSt, title, JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, optionSt, 7);
if (selectOp != -1)
break;
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (selectOp == 0) { // delete a faculty profile
try {
for (Faculty faculty : allFacultyList) {
if (faculty.getFacultyId() == facultyId) {
allFacultyList.remove(faculty);
JOptionPane.showMessageDialog(null, "Faculty Profile deleted", title, JOptionPane.INFORMATION_MESSAGE);
}
}
} catch (ConcurrentModificationException ignored) {
}
for (Course course : allCourseList) {
try {
if (course.getFaculty().getFacultyId()==facultyId) { // BUG HERE
course.dropFaculty();
}
} catch (NullPointerException ignored) {
}
}
}
else if (selectOp == 1) { // delete a faculty from a course
String courseId;
while (true) {
String msgID = "Enter the Course ID";
courseId = JOptionPane.showInputDialog(null, msgID, title, JOptionPane.QUESTION_MESSAGE);
if (courseId == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
} else
break;
}
if (courseId.isBlank()) {
JOptionPane.showOptionDialog(null, "Course ID iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
} // end OF search course ID
for (Course course : allCourseList) {
if (course.getCourseId().equals(courseId)) {
course.dropFaculty();
}
}
}
} // END of deleted faculty
}
public static void update() {
String title = "Menu-Based Application";
String[] returnOption = {"Return Home", "Cancel"};
String[] returnOption2 = {"Return Home"};
String msg = "\n" +
"---------------------------------------------------------------------------------------------------------------\n" +
" Update-Option\n" +
"---------------------------------------------------------------------------------------------------------------\n\n";
String[] option = {"Update a Student", "Update a Course", "Update a Faculty"};
int select;
while (true) {
select = JOptionPane.showOptionDialog(null, msg, title, JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, option, 7);
if (select != -1)
break;
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (select == 0) { //update a student
int studentId;
while (true) {
String msgID = "Enter the Student's ID";
String idString = JOptionPane.showInputDialog(null, msgID, title, JOptionPane.QUESTION_MESSAGE);
if (idString == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (idString != null && idString.isBlank()) {
JOptionPane.showOptionDialog(null, "ID number iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
try {
if (idString != null) {
studentId = Integer.parseInt(idString);
break;
}
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(null, "Please input correct ID format", title, JOptionPane.ERROR_MESSAGE);
}
} // END of Search Student ID
int exitSt = 0;
for (Student student : allStudentList) {
if (student.getStudentId()==studentId)
exitSt++;
}
if (exitSt==0) {
JOptionPane.showOptionDialog(null, "ID number Not Found", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
String[] optionSt = {"Student ID", "Student Name", "CGPA"};
int selectSt;
while (true) {
selectSt = JOptionPane.showOptionDialog(null, "What do you want to update...?", title, JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, optionSt, 7);
if (selectSt != -1)
break;
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (selectSt == 0) { // Update ID
int updateStudentId;
while (true) {
String msgID = "Enter the updated Student's ID";
String idString = JOptionPane.showInputDialog(null, msgID, title, JOptionPane.QUESTION_MESSAGE);
if (idString == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (idString != null && idString.isBlank()) {
JOptionPane.showOptionDialog(null, "ID number iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
try {
if (idString != null) {
updateStudentId = Integer.parseInt(idString);
break;
}
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(null, "Please input correct ID format", title, JOptionPane.ERROR_MESSAGE);
}
}
for (Student student : allStudentList) {
if (student.getStudentId()==studentId) {
student.setStudentId(updateStudentId);
JOptionPane.showMessageDialog(null, "Student ID Updated", title, JOptionPane.INFORMATION_MESSAGE);
}
}
} // END of update ID
else if (selectSt == 1) { // update name
String updatedStudentName;
while (true) {
String msgName = "Enter the Updated Student's Name";
updatedStudentName = JOptionPane.showInputDialog(null, msgName, title, JOptionPane.QUESTION_MESSAGE);
if (updatedStudentName == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
} else
break;
}
if (updatedStudentName.isBlank()) {
JOptionPane.showOptionDialog(null, "Name iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
for (Student student : allStudentList) {
if (student.getStudentId()==studentId) {
student.setStudentName(updatedStudentName);
JOptionPane.showMessageDialog(null, "Student Name Updated", title, JOptionPane.INFORMATION_MESSAGE);
}
}
} // END of update name
else if (selectSt == 2) { // Update CGPA
double updatedStudentCGPA;
while (true) {
String msgCGPA = "Enter the Student's CGPA ";
String CGPAString = JOptionPane.showInputDialog(null, msgCGPA, title, JOptionPane.QUESTION_MESSAGE);
if (CGPAString == null) {
int exitCheck = JOptionPane.showOptionDialog(null, "Are you sure ???", title, JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE, null, returnOption, 0);
if (exitCheck == 0)
startMenu();
}
if (CGPAString != null && CGPAString.isBlank()) {
JOptionPane.showOptionDialog(null, "Credit iS b l A n K", title, JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, returnOption2, 0);
startMenu();
}
try {
if (CGPAString != null && !(Double.parseDouble(CGPAString) > 0 && Double.parseDouble(CGPAString) <= 4)) {
JOptionPane.showMessageDialog(null, "Invalid CGPA", title, JOptionPane.ERROR_MESSAGE);
continue;
}
if (CGPAString != null) {
updatedStudentCGPA = Double.parseDouble(CGPAString);
break;
}
} catch (NumberFormatException e) {