University-Management-System/CourseRegistration.java at master · thatdevopsengineer/University-Management-System · GitHub

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importjava.util.*;
importjava.io.File;
importjava.io.FileWriter;
publicclassCourseRegistration{

staticScannerinput = newScanner(System.in);
staticMainmainClass = newMain(); // main class object
staticString[][] courseDetails;
staticStringsemester;

// public static void main(String[] args) {
// CourseRegistration ob = new CourseRegistration();
// ob.manage("SP21-BCS-066");
// }

staticvoidmanage(StringregNumber){
System.out.println("\n*******************************************************\n");
System.out.println("\tCourse Registration\n");
System.out.println("*******************************************************\n");


// Checking that courses registered or not.
try{
Filemyfile = newFile("students_data/"+ regNumber +".txt");
Scannersc = newScanner(myfile);
while(sc.hasNextLine()){
Stringline = sc.nextLine();
if(line.contains("Courses")){
System.out.print("Courses already registered!\n");
break;
 }
 }
 }
catch(Exceptione){
System.out.println(e);
 }

// Semester Entry and vallidation
while(true){
try{
System.out.print("Enter your semester(1 for first semester ..'1-8') : ");
semester = input.next();
if(Integer.parseInt(semester)<=8 && Integer.parseInt(semester)>0){
break;
 }
else{
System.out.println("Invalid input, Try again!");
input.nextLine();
 }
 }
catch(Exceptione){
System.out.println("Invalid input, Try again!");
input.nextLine();
 }
 }

Filemyfile = newFile("courses/"+ semester +".txt");


// finding total_courses in file
inttotal_courses = 0;
try{
Scannersc = newScanner(myfile);
while(sc.hasNextLine()){
Stringline = sc.nextLine();
total_courses++;
 }
 }
catch(Exceptione){
System.out.print(e);
 }


// Declaring the array size
courseDetails = newString[total_courses][4];


// Stroring data in a file.
int[] space = {15,30,15,30};
try{
Scannersc = newScanner(myfile);
inti=0,j=0;
System.out.print("\n\n");
System.out.printf("%-5s%-15s%-30s%-15s%-30s%n","ID","Course_Code","Course_Title","Credit_Hours","Instructor");
System.out.println("------------------------------------------------------------------------------------------");
while(sc.hasNextLine()){
System.out.printf("%-5d",i);
Stringline = sc.nextLine();
String[] data = line.split(",",4);
for(Stringitem:data){
System.out.printf(("%-"+space[j]+"s"),item);
courseDetails[i][j] = item;
j++;
 }
i++;
j=0;
System.out.println();
 }
 }
catch(Exceptione){
System.out.print(e);
 }


// Course Registration

while(true){
try{
System.out.print("Enter the ID's of courses you want to register(comma separated) : ");
String[] ids = input.next().split(",");
for(Stringe:ids){
if(Integer.parseInt(e)>courseDetails.length-1 && Integer.parseInt(e)<0){
continue;
 }
 }
try{
FileWriterfileWriter = newFileWriter("students_data/"+ regNumber +".txt",true);

fileWriter.write("\nCourses:");
intj=0;
for(Stringid:ids){
inti=0;
for(Stringd:courseDetails[Integer.parseInt(id)]){
fileWriter.write(d);
if(i<3){
fileWriter.write(",");
 }
i++;
 }
if(j<ids.length-1){
fileWriter.write(" | ");
 }
j++;
 }

fileWriter.close();
System.out.println("Courses Registered Successfully!");
break;
 }
catch(Exceptione){
System.out.print(e);
 }
 }
catch(Exceptione){

 }
 }

// System.out.println("5. Previous Menu");
// System.out.println();
// System.out.print("Enter your choice : ");
// int c = input.nextInt();

// switch(c){
// case 5 : {
// mainClass.management(regNumber);
// break;
// }
// }
	}
}