I posted earlier my question. my code was messy. I apologise for that.
I rewrite it.
when I run it choice number 1 and 2 works fine but when i try choice number 3 and 4 for some reason it doesn't work properly like the output example.
Any help would be appreciated. thanks in advance
import java.util.Scanner;
public class Problem2 {
public static void main(String[] args) {
while (true) {
Scanner in = new Scanner(System.in);
System.out.println("1.Enroll Student");
System.out.print("");
System.out.println("2.Offer Course");
System.out.println("3.Registration ");
System.out.println("4.Enter Result ");
int choice = in.nextInt();
if (choice == 1) {
StudentClass[] studentList = new StudentClass[500];
studentList[0] = new StudentClass();
while (true) {
System.out.print(" Enter name of the student: ");
studentList[0].setName(in.next());
System.out.println("");
System.out.print("The student is given the unique ID = " + studentList[0].getUniqueStudentID() + " and the number of students = " + studentList[0].getNumberOfStudents());
System.out.println("");
System.out.print("Enter the e-mail address of the student: ");
studentList[0].setEmail(in.next());
System.out.print("Enter the semester number of the student: ");
studentList[0].setSemesterNumber(in.nextInt());
System.out.print(" Add another student (Y/N): ");
char add = in.next().charAt(0);
if (add == 'Y' || add == 'y') {
}
if (add == 'N' || add == 'n') {
break;
}
}
} else if (choice == 2) {
while (true) {
int num;
CourseClass[] courseOfferedList;
courseOfferedList = new CourseClass[500];
courseOfferedList[0] = new CourseClass();
System.out.print("Enter the course code : ");
courseOfferedList[0].setCourseCode(in.next());
System.out.println(" Enter the course title: ");
courseOfferedList[0].setCourseTitl(in.next());
System.out.println(" Enter the credit hours of the course: ");
courseOfferedList[0].setCreditHours(in.nextInt());
System.out.print(" Add another course (Y/N): ");
char add2 = in.next().charAt(0);
if (add2 == 'Y' || add2 == 'y') {
}
if (add2 == 'N' || add2 == 'n') {
break;
}
}
} else if (choice == 3) {
RegistrationClass[] registrationList;
registrationList = new RegistrationClass[500];
registrationList[0] = new RegistrationClass();
CourseClass[] courseOfferedList;
courseOfferedList = new CourseClass[500];
courseOfferedList[0] = new CourseClass();
StudentClass[] studentList = new StudentClass[500];
studentList[0] = new StudentClass();
while (true) {
while (true) {
System.out.print("Enter the unique student ID: ");
registrationList[0].setUniqueStudentID(in.nextInt());
if (registrationList[0].getUniqueStudentID() == studentList[0].getUniqueStudentID()) {
while (true) {
System.out.print("Enter the course code: ");
registrationList[0].setCourseCode(in.next());
if (registrationList[0].getCourseCode().equalsIgnoreCase(courseOfferedList[0].getCourseCode())) {
System.out.println("The registration is given the unique ID = " + registrationList[0].getUniqueRegistrationID() + " and the number of registrations = " + registrationList[0].getNumberOfRegistrations());
System.out.print(" Add another course (Y/N): ");
char add2 = in.next().charAt(0);
if (add2 == 'Y' || add2 == 'y') {
}
if (add2 == 'N' || add2 == 'n') {
break;
}
} else {
System.out.println("The course has not been offered yet, try again");
}
}
} else {
System.out.println("The student does not exit, try again ");
}
}
}
} else if (choice == 4) {
while (true) {
RegistrationClass[] registrationList;
registrationList = new RegistrationClass[500];
registrationList[0] = new RegistrationClass();
StudentClass[] studentList;
studentList = new StudentClass[500];
studentList[0] = new StudentClass();
CourseClass[] courseOfferedList;
courseOfferedList = new CourseClass[500];
courseOfferedList[0] = new CourseClass();
System.out.println("Enter the registration ID: ");
registrationList[0].setUniqueRegistrationID(in.nextInt());
System.out.print(" Enter marks of " + studentList[0].getName() + " in " + courseOfferedList[0].getCourseCode() + " (" + courseOfferedList[0].getCourseTitl() + ") :");
System.out.println("");
System.out.print(" Add another registration (Y/N): ");
char add2 = in.next().charAt(0);
if (add2 == 'Y' || add2 == 'y') {
}
if (add2 == 'N' || add2 == 'n') {
break;
}
}
}
}
}
}
class RegistrationClass {
private int uniqueRegistrationID;
private int uniqueStudentID;
private String courseCode;
private int marks;
static int numberOfRegistrations = 0;
public RegistrationClass() {
uniqueRegistrationID = 0;
uniqueStudentID = 0;
courseCode = null;
numberOfRegistrations = 0;
}
public int getUniqueRegistrationID() {
return uniqueRegistrationID++;
}
public void setUniqueRegistrationID(int uniqueRegistrationID) {
this.uniqueRegistrationID = uniqueRegistrationID;
}
public int getUniqueStudentID() {
return uniqueStudentID++;
}
public void setUniqueStudentID(int uniqueStudentID) {
this.uniqueStudentID = uniqueStudentID;
}
public String getCourseCode() {
return courseCode;
}
public void setCourseCode(String courseCode) {
this.courseCode = courseCode;
}
public int getMarks() {
return marks;
}
public void setMarks(int marks) {
this.marks = marks;
}
public static int getNumberOfRegistrations() {
return numberOfRegistrations++;
}
public static void setNumberOfRegistrations(int numberOfRegistrations) {
RegistrationClass.numberOfRegistrations = numberOfRegistrations;
}
}
class StudentClass {
private String name;
private int uniqueStudentID;
private String email;
private int mobileNumber;
private int semesterNumber;
static int numberOfStudents = 0;
public StudentClass() {
name = null;
uniqueStudentID = 1;
email = null;
mobileNumber = 0;
semesterNumber = 0;
numberOfStudents = 1;
}
public void setName(String name) {
this.name = name;
}
public void setUniqueStudentID(int uniqueStudentID) {
this.uniqueStudentID = uniqueStudentID;
}
public void setEmail(String email) {
this.email = email;
}
public void setMobileNumber(int mobileNumber) {
this.mobileNumber = mobileNumber;
}
public void setSemesterNumber(int semesterNumber) {
this.semesterNumber = semesterNumber;
}
public void setNumberOfStudents(int numberOfStudents) {
this.numberOfStudents = numberOfStudents;
}
public String getName() {
return name;
}
public int getUniqueStudentID() {
return uniqueStudentID++;
}
public String getEmail() {
return email;
}
public int getMobileNumber() {
return mobileNumber;
}
public int getSemesterNumber() {
return semesterNumber;
}
public int getNumberOfStudents() {
return numberOfStudents++;
}
void setName() {
}
void setuniqueStudentID() {
}
void setnumberOfStudents() {
}
void setsemesterNumber() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
void setmobileNumber() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
void setemail() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
void setemail(String next) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
void setsemesterNumber(int nextInt) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}
class CourseClass {
private String courseCode;
private String courseTitl;
private int creditHours;
static int numberOfCourses = 0;
public CourseClass() {
courseCode = null;
courseTitl = null;
creditHours = 0;
numberOfCourses = 0;
}
public String getCourseCode() {
return courseCode;
}
public void setCourseCode(String courseCode) {
this.courseCode = courseCode;
}
public String getCourseTitl() {
return courseTitl;
}
public void setCourseTitl(String courseTitl) {
this.courseTitl = courseTitl;
}
public int getCreditHours() {
return creditHours;
}
public void setCreditHours(int creditHours) {
this.creditHours = creditHours;
}
public static int getNumberOfCourses() {
return numberOfCourses;
}
public static void setNumberOfCourses(int numberOfCourses) {
CourseClass.numberOfCourses = numberOfCourses;
}
boolean setCourseCode() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}
this is how the output should look like
is used for input and < is used for output
{Display the menu, Choose the menu item}
1
Enter name of the student: john
< The student is given the unique ID = 1 and the number of students = 1
Enter the e-mail address of the student: john@stu.kau.edu.uk
Enter the semester number of the student: 3 Add another student (Y/N): Y Enter name of the student: Ibrahim
< The student is given the unique ID = 2 and the number of students = 2
Enter the e-mail address of the student: Ibrahim@stu.kau.edu.uk
Enter the semester number of the student: 3 Add another student (Y/N): N
{Display the menu, Choose the menu item}
2 Enter the course code: CPCS203
Enter the course title: Programming 2
Enter the credit hours of the course: 4 Add another course (Y/N): Y
Enter the course code: CPCS204
Enter the course title: Data Structures
Enter the credit hours of the course: 3 Add another course (Y/N): N
{Display the menu, Choose the menu item}
3
Enter the unique student ID: 3
< The student does not exit, try again
Enter the unique student ID: 1
Enter the course code: CPCS205
< The course has not been offered yet, try again
Enter the course code: CPCS203
< The registration is given the unique ID = 1 and the number of registrations = 1
Add another registration (Y/N): Y
Enter the unique student ID: 1
Enter the course code: CPCS204
< The registration is given the unique ID = 2 and the number of registrations = 2
Add another registration (Y/N): Y
Enter the unique student ID: 2
Enter the course code: CPCS204
< The registration is given the unique ID = 3 and the number of registrations = 3
Add another registration (Y/N): Y
Enter the unique student ID: 2
Enter the course code: CPCS204
< The registration is given the unique ID = 4 and the number of registrations = 4
Add another registration (Y/N): N
{Display the menu, Choose the menu item}
4
Enter the registration ID: 1
Enter marks of john in CPCS203 (Programming 2): 85
Add another registration (Y/N): Y
Enter the registration ID: 2
Enter marks of john in CPCS204 (Data Structures): 60
Add another registration (Y/N): Y
Enter the registration ID: 3
Enter marks of Ibrahim in CPCS203 (Programming 2): 95
Add another registration (Y/N): Y
Enter the registration ID: 4
Enter marks of Ibrahim in CPCS204 (Data Structures): 85
Add another registration (Y/N): N
{Display the menu, Choose the menu item}
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